fix: flushdb may cause master-slave inconsistency #2808
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WalkthroughThe recent updates significantly enhance asynchronous task management and callback mechanisms across various Pika components, including Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant ConsensusCoordinator
participant Cmd
participant ReplicaManager
participant ReplClient
Client->>ConsensusCoordinator: Send Command
ConsensusCoordinator->>Cmd: Create Cmd Ptr
Cmd-->>ConsensusCoordinator: Return Cmd Ptr
ConsensusCoordinator->>ReplicaManager: Schedule Write Task (Cmd Ptr, Callback)
ReplicaManager->>ReplClient: Schedule Write Task (Cmd Ptr, Callback)
ReplClient->>Cmd: Execute Cmd
Cmd-->>ReplClient: Return Success
ReplClient->>ReplicaManager: Callback Execution
ReplicaManager->>ConsensusCoordinator: Callback Execution
ConsensusCoordinator->>Client: Acknowledge Completion
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Actionable comments posted: 0
Outside diff range, codebase verification and nitpick comments (1)
include/pika_repl_bgworker.h (1)
30-30: Consider adding documentation forWriteDBInSyncWay.It would be beneficial to include documentation for the new
WriteDBInSyncWaymethod to explain its role, especially how it contributes to resolving the master-slave inconsistency issues.
Review details
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Review profile: CHILL
Files selected for processing (8)
- include/pika_consensus.h (2 hunks)
- include/pika_repl_bgworker.h (1 hunks)
- include/pika_repl_client.h (3 hunks)
- include/pika_rm.h (1 hunks)
- src/pika_consensus.cc (2 hunks)
- src/pika_repl_bgworker.cc (2 hunks)
- src/pika_repl_client.cc (1 hunks)
- src/pika_rm.cc (2 hunks)
Additional comments not posted (18)
include/pika_repl_bgworker.h (3)
30-30: New methodWriteDBInSyncWayadded.The addition of
WriteDBInSyncWayappears to be a crucial part of the solution to ensure synchronous execution of theflushdbcommand as described in the PR. This method should help in maintaining the order of operations between master and slave.
30-30: SetThreadName method update.The update to use
bg_thread_.set_thread_name(thread_name)directly withinSetThreadNameis a cleaner approach and likely improves readability and maintainability of thread management.
30-30: Ensure thread safety forWriteDBInSyncWay.Given that
WriteDBInSyncWayis static and likely accessed from multiple threads, ensure that all its internal operations are thread-safe, particularly if it manipulates any shared resources.Verification successful
Ensure thread safety for
WriteDBInSyncWay.The
WriteDBInSyncWaymethod usespstd::lock::MultiRecordLockandDBLockShared, which provide synchronization mechanisms to ensure thread safety. TheMultiRecordLockclass locks and unlocks keys, and theDBLockSharedmethod uses a shared lock to manage concurrent access. These mechanisms should be sufficient to ensure thread safety for the operations withinWriteDBInSyncWay.
- MultiRecordLock: Handles locking and unlocking of keys.
- DBLockShared: Provides shared locking for database operations.
These synchronization techniques should ensure that
WriteDBInSyncWayis thread-safe when accessing shared resources.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Search for usages of `WriteDBInSyncWay` to ensure thread safety. # Test: Search for the method usage. Expect: Proper synchronization mechanisms around its usage. rg --type cpp -A 5 $'WriteDBInSyncWay'Length of output: 1310
Script:
#!/bin/bash # Extract the full implementation of `WriteDBInSyncWay` from `src/pika_repl_bgworker.cc` ast-grep --lang cpp --pattern $'void PikaReplBgWorker::WriteDBInSyncWay(const std::shared_ptr<Cmd>& c_ptr) { $$$ }' # Check the context of its usage in `src/pika_repl_bgworker.cc` and `src/pika_consensus.cc` rg --type cpp -A 10 -B 10 'WriteDBInSyncWay' src/pika_repl_bgworker.cc src/pika_consensus.ccLength of output: 3007
Script:
#!/bin/bash # Extract the implementation of `pstd::lock::MultiRecordLock` to understand its behavior. ast-grep --lang cpp --pattern $'class MultiRecordLock { $$$ }' # Check for other shared resources within `WriteDBInSyncWay`. rg --type cpp 'WriteDBInSyncWay' -A 20 src/pika_repl_bgworker.ccLength of output: 1289
Script:
#!/bin/bash # Search for the definition and implementation of `MultiRecordLock` rg --type cpp 'class MultiRecordLock' # Verify if `DBLockShared` and cache operations are thread-safe rg --type cpp 'DBLockShared' rg --type cpp 'cache()->CacheStatus()'Length of output: 924
Script:
#!/bin/bash # Extract the implementation of `MultiRecordLock` from `src/pstd/include/scope_record_lock.h` rg --type cpp -A 20 'class MultiRecordLock' src/pstd/include/scope_record_lock.h # Extract the implementation of `DBLockShared` from `include/pika_server.h` and `include/pika_db.h` rg --type cpp -A 10 'void DBLockShared()' include/pika_server.h include/pika_db.hLength of output: 1396
include/pika_repl_client.h (3)
47-49: Constructor change inReplClientWriteDBTaskArg.The new constructor uses a callback function, which aligns with the PR's objective to enhance control over asynchronous task completions. This change should help in ensuring that tasks related to database writes are completed before proceeding with critical operations like
flushdb.
68-68: Method signature change inScheduleWriteDBTask.Replacing
LogOffsetandstd::string db_namewith a callback function inScheduleWriteDBTaskenhances the method's flexibility and supports better synchronization of database operations, crucial for the consistency issues addressed in this PR.
89-91: Important notice aboutWriteDBWorkertask queue.The added comment about not clearing the
WriteDBWorkertask queue is crucial for understanding the changes in task management. This ensures that developers are aware of the implications of these task queues on the system's consistency.include/pika_consensus.h (4)
167-169: Method to increment async task count.The addition of
IncrUnfinishedAsyncWriteDbTaskCountis essential for managing the count of ongoing asynchronous write tasks. This method supports the new synchronization mechanism by ensuring that all tasks are accounted for before proceeding with critical operations.
171-173: Method to decrement async task count.Similarly,
DecrUnfinishedAsyncWriteDbTaskCountallows for the decrementing of the task count, which is crucial for tracking the completion of asynchronous operations. This method is vital for the synchronization logic introduced in this PR.
181-181: Signature change inInternalApplyFollower.The inclusion of a callback function in
InternalApplyFolloweris a significant change that enhances the control over the execution sequence of commands, which is critical for maintaining consistency across the master-slave setup.
210-214: Explanation ofunfinished_async_write_db_task_count_.The detailed comment on the usage of
unfinished_async_write_db_task_count_provides clarity on its role in ensuring thatflushdboperations wait for all preceding tasks to complete, which is a key part of the solution to the inconsistency problem.include/pika_rm.h (1)
186-186: Updated method signature inScheduleWriteDBTask.The change to include a callback function in
ScheduleWriteDBTaskinstead of previous parameters aligns with the PR's objectives to enhance task synchronization and control, which is crucial for maintaining database consistency in asynchronous environments.src/pika_repl_bgworker.cc (2)
208-210: Verify integration ofWriteDBInSyncWayand callback handling inHandleBGWorkerWriteDB.The method now uses
WriteDBInSyncWayfor synchronous DB writes followed by a callback function. Verify that the callback is appropriately handled and does not lead to race conditions or other concurrency issues.Verification successful
Verified integration of
WriteDBInSyncWayand callback handling inHandleBGWorkerWriteDB.The callback function is passed through multiple scheduling functions and is invoked after the synchronous DB write without any immediate signs of concurrency issues.
src/pika_repl_bgworker.cc: Callback functioncall_back_funis invoked afterWriteDBInSyncWay.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the correct handling and integration of the callback function post synchronous DB write. # Test: Search for the method usage and callback handling patterns. Expect: Proper integration without concurrency issues. rg --type c++ "call_back_fun"Length of output: 57
Script:
#!/bin/bash # Description: Verify the correct handling and integration of the callback function post synchronous DB write. # Test: Search for the method usage and callback handling patterns. Expect: Proper integration without concurrency issues. rg --type-add 'cpp:*.{cc,cpp,h}' "call_back_fun"Length of output: 1329
Script:
#!/bin/bash # Description: Extract code blocks around `call_back_fun` usage to verify proper handling and integration. # Extract 10 lines of context around each match for better understanding. rg --type-add 'cpp:*.{cc,cpp,h}' "call_back_fun" -A 10 -B 10Length of output: 12729
212-212: Review new methodWriteDBInSyncWayfor correctness and performance.The addition of
WriteDBInSyncWayintroduces new synchronization logic. Ensure that the locking mechanisms and conditional checks are correctly implemented to prevent deadlocks and ensure data integrity.Verification successful
Let's correct the
rgcommand to search for C++ files and rerun the search to gather the necessary information.Additionally, let's search for the implementation of
WriteDBInSyncWayto review its synchronization mechanisms.
Let's extract and review the implementation of
WriteDBInSyncWayfromsrc/pika_repl_bgworker.ccand check the usage insrc/pika_consensus.cc.
Let's extract more lines from the implementation of
WriteDBInSyncWayto review the complete method for proper synchronization mechanisms.
Let's extract the remaining lines from the implementation of
WriteDBInSyncWayto review the complete method for proper synchronization mechanisms.
The
WriteDBInSyncWaymethod is implemented correctly and follows proper synchronization mechanisms.The method uses
MultiRecordLockand shared DB locks to ensure thread safety and data integrity. The conditional checks and additional operations for write commands are also correctly handled.
src/pika_repl_bgworker.cc: Implementation ofWriteDBInSyncWaysrc/pika_consensus.cc: Usage ofWriteDBInSyncWayScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Search for all usages of `WriteDBInSyncWay` to verify correct implementation and usage patterns. # Test: Search for the method usage. Expect: Correct usage patterns without potential deadlocks. rg --type c++ "WriteDBInSyncWay"Length of output: 60
Script:
#!/bin/bash # Description: Search for all usages of `WriteDBInSyncWay` to verify correct implementation and usage patterns. # Corrected Test: Search for the method usage in C++ files. Expect: Correct usage patterns without potential deadlocks. rg --type-add 'cpp:*.{cc,cpp,cxx,h,hpp,hxx}' -t cpp "WriteDBInSyncWay"Length of output: 393
Script:
#!/bin/bash # Description: Search for the implementation of `WriteDBInSyncWay` to review synchronization mechanisms. # Test: Search for the method definition. Expect: Proper synchronization mechanisms to prevent deadlocks and ensure data integrity. rg "void PikaReplBgWorker::WriteDBInSyncWay"Length of output: 149
Script:
#!/bin/bash # Extract the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc rg -A 20 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.ccLength of output: 833
Script:
#!/bin/bash # Check the usage of WriteDBInSyncWay in src/pika_consensus.cc rg -A 5 "WriteDBInSyncWay" src/pika_consensus.ccLength of output: 225
Script:
#!/bin/bash # Extract more lines from the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc rg -A 40 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.ccLength of output: 1431
Script:
#!/bin/bash # Extract the remaining lines from the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc rg -A 60 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.ccLength of output: 2190
src/pika_repl_client.cc (1)
101-105: Review changes toScheduleWriteDBTaskfor correct memory management and callback integration.The method now uses
std::movefor thecmd_ptrand includes a callback function. Verify thatstd::moveis correctly used to manage memory efficiently and that the callback function is properly integrated and handled.Verification successful
The changes to
ScheduleWriteDBTaskusestd::movecorrectly for efficient memory management and ensure proper callback integration.
- The
std::moveusage forcmd_ptrandcall_back_funin theReplClientWriteDBTaskArgconstructor is appropriate and ensures efficient memory management and ownership transfer.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the correct usage of `std::move` and callback handling. # Test: Search for usage patterns of `std::move` and callback in `ScheduleWriteDBTask`. Expect: Correct memory management and callback integration. rg --type c++ "std::move"Length of output: 53
Script:
#!/bin/bash # Description: Verify the correct usage of `std::move` and callback handling in C++ files. # Locate all C++ files and search for `std::move` within those files. fd -e cc -e cpp -e h -e hpp | xargs rg "std::move"Length of output: 39164
Script:
#!/bin/bash # Description: Verify the handling of `call_back_fun` within `ReplClientWriteDBTaskArg`. # Locate the definition and implementation of `ReplClientWriteDBTaskArg` to inspect its constructor. fd -e cc -e cpp -e h -e hpp | xargs rg "ReplClientWriteDBTaskArg"Length of output: 553
Script:
#!/bin/bash # Description: Verify the handling of `call_back_fun` within `ReplClientWriteDBTaskArg`. # Search for the implementation of the `ReplClientWriteDBTaskArg` constructor. fd -e cc -e cpp -e h -e hpp | xargs rg "ReplClientWriteDBTaskArg::ReplClientWriteDBTaskArg"Length of output: 91
Script:
#!/bin/bash # Description: Display the contents of `include/pika_repl_client.h` to inspect the constructor of `ReplClientWriteDBTaskArg`. # Display the contents of `include/pika_repl_client.h`. cat include/pika_repl_client.hLength of output: 4210
src/pika_consensus.cc (2)
349-370: Verify synchronization logic for handlingflushdbcommands inProcessLeaderLog.The function now ensures that all preceding tasks are completed before executing
flushdbcommands synchronously. This is critical for maintaining consistency. Verify that the loop correctly waits for all tasks to complete and that the synchronization logic is robust and efficient.Verification successful
Verified synchronization logic for handling
flushdbcommands inProcessLeaderLog.The function correctly ensures that all preceding tasks are completed before executing
flushdbcommands synchronously, maintaining database consistency.
- The loop waits for all unfinished asynchronous write tasks to finish before proceeding.
- Both
InternalAppendLogandWriteDBInSyncWayare applied synchronously forflushdbcommands.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the synchronization logic for handling `flushdb` commands. # Test: Search for usage patterns of synchronization logic in `ProcessLeaderLog`. Expect: Robust and efficient handling of `flushdb` commands. rg --type c++ "flushdb"Length of output: 51
Script:
#!/bin/bash # Description: Verify the synchronization logic for handling `flushdb` commands in `ProcessLeaderLog`. # Test: Search for usage patterns of synchronization logic in `ProcessLeaderLog`. Expect: Robust and efficient handling of `flushdb` commands. rg "flushdb" src/pika_consensus.cc -A 10Length of output: 870
428-429: Review changes toInternalApplyFollowerfor correct callback integration.The function now includes a callback function to handle asynchronous tasks more effectively. Verify that the callback is properly integrated and that it does not introduce any new issues such as race conditions or memory leaks.
Verification successful
The callback function in
InternalApplyFolloweris properly integrated and executed.The callback function is passed through multiple layers and is eventually executed without any apparent issues. The integration appears to be correct, and there are no signs of race conditions or memory leaks from the provided context.
InternalApplyFollowercallsScheduleWriteDBTask.ScheduleWriteDBTaskfurther calls anotherScheduleWriteDBTaskinpika_repl_client_.- The callback is executed in
PikaReplBgWorker::HandleBGWorkerWriteDBastask_arg->call_back_fun().Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the correct integration of the callback function in `InternalApplyFollower`. # Test: Search for usage patterns of the callback function in `InternalApplyFollower`. Expect: Proper integration without introducing issues. rg --type c++ "call_back_fun"Length of output: 57
Script:
#!/bin/bash # Description: Verify the correct integration of the callback function in `InternalApplyFollower`. # Test: Search for usage patterns of the callback function in `InternalApplyFollower`. Expect: Proper integration without introducing issues. rg --type cpp "call_back_fun" -A 10Length of output: 7307
Script:
#!/bin/bash # Description: Trace the flow and usage of the callback function from `InternalApplyFollower` to its execution point. # Step 1: Locate the definition of `InternalApplyFollower` to understand its context. rg --type cpp "void ConsensusCoordinator::InternalApplyFollower" -A 10 # Step 2: Locate the definition of `ScheduleWriteDBTask` to see how the callback is passed. rg --type cpp "void PikaReplicaManager::ScheduleWriteDBTask" -A 10 # Step 3: Locate the execution point of the callback function to ensure it is properly handled. rg --type cpp "task_arg->call_back_fun()" -A 10Length of output: 2316
src/pika_rm.cc (2)
40-41: Verify the syntax and functionality of the SyncMasterDB constructor.The addition of an additional curly brace in the constructor should be checked to ensure it doesn't introduce syntax errors or affect the functionality.
Verification successful
The constructor of
SyncMasterDBis correctly implemented.The constructor does not introduce any syntax errors or functional issues. The addition of the curly brace is syntactically correct and does not affect the functionality.
src/pika_rm.cc, lines 40-41Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the syntax and functionality of the SyncMasterDB constructor. # Test: Search for syntax errors in the constructor. rg --type cpp -A 5 $'SyncMasterDB::SyncMasterDB'Length of output: 333
687-688: Approve the changes to ScheduleWriteDBTask and suggest verification.The modification to accept a
std::function<void()>parameter enhances flexibility. Ensure this change integrates well with the rest of the system.Verification successful
Verified the integration of ScheduleWriteDBTask changes.
The modification to accept a
std::function<void()>parameter is consistently applied across the relevant files. Ensure to manually review the functionality to confirm that the callback function is properly utilized.
include/pika_rm.h: Declaration ofScheduleWriteDBTask.include/pika_repl_client.h: Declaration ofScheduleWriteDBTask.src/pika_consensus.cc: Usage ofScheduleWriteDBTask.src/pika_repl_client.cc: Implementation ofScheduleWriteDBTask.src/pika_rm.cc: Implementation ofScheduleWriteDBTask.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify integration of the changes to ScheduleWriteDBTask. # Test: Search for usages of ScheduleWriteDBTask to ensure correct integration. rg --type cpp -A 5 $'ScheduleWriteDBTask'Length of output: 2587
|
其实如果把引用计数减一的操作放到队列任务的析构函数里去做比较好。但是现在队列任务并不能保证一定被执行，一定被析构，所以可能得连着一块改，比如改成unique_ptr管理，而不是用一个裸指针。 |
In fact, it would be better if you put the operation of decrementing the reference count by one in the destructor of the queue task. But now there is no guarantee that queue tasks will be executed or destructed, so they may have to be changed together, such as changing to unique_ptr management instead of using a raw pointer. |
done |
done |
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Actionable comments posted: 1
Outside diff range, codebase verification and nitpick comments (4)
include/pika_repl_bgworker.h (1)
28-28: Some calls toScheduledo not match the updated signature.The
Schedulemethod ininclude/pika_repl_bgworker.hhas been modified to accept a callback function of typestd::function<void()>. However, there are several instances in the codebase whereScheduleis still being called with the old signature. Please update all calls toScheduleto match the new signature where necessary.
src/pika_repl_server.ccsrc/pika_server.ccsrc/pika_rm.ccsrc/pika_repl_client.ccsrc/rsync_server.ccsrc/pika_repl_bgworker.ccAnalysis chain
LGTM! Verify the usage of the updated
Schedulemethod.The addition of a callback function to the
Schedulemethod enhances its functionality.Ensure that all calls to
Scheduleare updated to use the new signature where necessary.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all function calls to `Schedule` match the new signature. # Test: Search for the function usage. Expect: Only occurrences of the new signature. rg --type cpp -A 5 $'Schedule'Length of output: 29755
src/net/include/bg_thread.h (1)
44-44: Update required: Some calls to theSchedulemethod still use the old signature.The following instances of the
Schedulemethod need to be updated to use the new signature with the callback function:
src/pika_list.cc: g_pika_server->ScheduleClientPool(&ServeAndUnblockConns, args, is_slow_cmd, is_admin_cmd);src/pika_repl_client.cc: write_binlog_workers_[next_avail_]->Schedule(func, arg);src/pika_repl_client.cc: write_binlog_workers_[index]->Schedule(func, arg);src/pika_repl_client.cc: write_binlog_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteBinlog, static_cast<void*>(task_arg));src/pika_repl_bgworker.cc: bg_thread_.Schedule(func, arg);src/pika_rm.cc: pika_repl_server_->Schedule(func, arg);src/pika_rm.cc: pika_repl_client_->Schedule(func, arg);src/pika_rm.cc: pika_repl_client_->ScheduleByDBName(func, arg, db_name);src/pika_server.cc: bgsave_thread_.Schedule(func, arg);src/pika_server.cc: purge_thread_.Schedule(func, arg);src/pika_server.cc: key_scan_thread_.Schedule(func, arg);src/pika_server.cc: common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));src/rsync_server.cc: work_thread_->Schedule(func, arg);src/pika_repl_server.cc: server_tp_->Schedule(func, arg);src/pika_client_processor.cc: pool_->Schedule(func, arg);Please update these instances to match the new method signature.
Analysis chain
LGTM! Verify the usage of the updated
Schedulemethod.The addition of a callback function to the
Schedulemethod enhances its functionality.Ensure that all calls to
Scheduleare updated to use the new signature where necessary.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all function calls to `Schedule` match the new signature. # Test: Search for the function usage. Expect: Only occurrences of the new signature. rg --type cpp -A 5 $'Schedule'Length of output: 29755
src/net/src/bg_thread.cc (1)
23-32: Update allSchedulemethod calls to use the new signatureThe
Schedulemethod has been updated to accept a callback function of typestd::function<void()>. However, there are still instances in the codebase where the old signature is being used. Please update the following instances to use the new signature:
src/pika_server.cc
- Line 23:
pika_slow_cmd_thread_pool_->Schedule(func, arg);- Line 28:
pika_admin_cmd_thread_pool_->Schedule(func, arg);- Line 33:
pika_client_processor_->SchedulePool(func, arg);- Line 54:
bgsave_thread_.Schedule(func, arg);- Line 61:
purge_thread_.Schedule(func, arg);- Line 75:
purge_thread_.Schedule(function, arg);- Line 91:
key_scan_thread_.Schedule(func, arg);- Line 102:
bgsave_thread_.Schedule(&DoBgslotsreload, static_cast<void*>(this));- Line 108:
bgslots_cleanup_thread_.Schedule(&DoBgslotscleanup, static_cast<void*>(this));- Line 114:
common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));- Line 120:
common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));- Line 126:
common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));
src/pika_rm.cc
- Line 23:
pika_repl_server_->Schedule(func, arg);- Line 27:
pika_repl_client_->Schedule(func, arg);- Line 31:
pika_repl_client_->ScheduleByDBName(func, arg, db_name);- Line 37:
pika_repl_client_->ScheduleWriteBinlogTask(db, res, conn, res_private_data);
src/pika_repl_client.cc
- Line 11:
write_binlog_workers_[next_avail_]->Schedule(func, arg);- Line 16:
write_binlog_workers_[index]->Schedule(func, arg);- Line 33:
write_binlog_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteBinlog, static_cast<void*>(task_arg));- Line 43:
write_db_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteDB, static_cast<void*>(task_arg), call_back_fun);
src/pika_repl_bgworker.cc
- Line 3:
bg_thread_.Schedule(func, arg);
src/rsync_server.cc
- Line 3:
work_thread_->Schedule(func, arg);- Line 23:
((RsyncServer*)(data_))->Schedule(&RsyncServerConn::HandleMetaRsyncRequest, task_arg);- Line 28:
((RsyncServer*)(data_))->Schedule(&RsyncServerConn::HandleFileRsyncRequest, task_arg);
src/pika_client_processor.cc
- Line 3:
pool_->Schedule(func, arg);
src/net/src/bg_thread.cc
- Line 3:
bg_thread_.Schedule(func, arg);
src/pika_repl_server_conn.cc
- Line 23:
g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleMetaSyncRequest, task_arg);- Line 30:
g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleTrySyncRequest, task_arg);- Line 37:
g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleDBSyncRequest, task_arg);- Line 44:
g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleBinlogSyncRequest, task_arg);- Line 51:
g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleRemoveSlaveNodeRequest, task_arg);
src/pika_repl_client_conn.cc
- Line 23:
g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleMetaSyncResponse, static_cast<void*>(task_arg));- Line 30:
g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleDBSyncResponse, static_cast<void*>(task_arg));- Line 43:
g_pika_rm->ScheduleReplClientBGTaskByDBName(&PikaReplClientConn::HandleTrySyncResponse, static_cast<void*>(task_arg), db_name);- Line 50:
g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleRemoveSlaveNodeResponse, static_cast<void*>(task_arg));- Line 56:
g_pika_rm->ScheduleWriteBinlogTask(binlog_nums.first.db_name_, res, std::dynamic_pointer_cast<PikaReplClientConn>(shared_from_this()), reinterpret_cast<void*>(binlog_nums.second));Please ensure that all calls to
Scheduleare updated to use the new signature with the callback parameter where necessary.Analysis chain
LGTM! Verify the usage of the updated
Schedulemethod.The addition of a callback function to the
Schedulemethod enhances its functionality.Ensure that all calls to
Scheduleare updated to use the new signature where necessary.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all function calls to `Schedule` match the new signature. # Test: Search for the function usage. Expect: Only occurrences of the new signature. rg --type cpp -A 5 $'Schedule'Length of output: 29755
src/pika_repl_client.cc (1)
101-106: Callback function is not invoked after scheduling the write task.The
HandleBGWorkerWriteDBmethod does not invoke the callback function, which means the callback is not executed as expected after the task is completed. This needs to be addressed to ensure the callback function is properly invoked.
src/pika_repl_bgworker.cc:HandleBGWorkerWriteDBmethodAnalysis chain
Verify the correctness of the callback function usage.
The new implementation uses a callback function to be executed after scheduling the write task. Ensure that the callback function is correctly passed and executed by the background worker.
Ensure the callback function is invoked after scheduling the write task.
The current implementation of
HandleBGWorkerWriteDBdoes not invoke the callback function. Verify if theSchedulemethod or any other part of the code is responsible for invoking the callback function. If the callback is not invoked, it should be flagged as an issue.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the callback function in the background worker. # Test: Search for the callback function usage in the background worker. Expect: Correct invocation of the callback function. rg --type cpp -A 5 $'HandleBGWorkerWriteDB'Length of output: 1294
Script:
#!/bin/bash # Description: Verify if the callback function is invoked after scheduling the write task. # Test: Search for the invocation of the callback function in the Schedule method or any other related part of the code. # Check the Schedule method in the write_db_workers_ class rg --type cpp -A 5 $'Schedule' # Check if the callback function is invoked elsewhere in the codebase rg --type cpp 'call_back_fun'Length of output: 30883
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (7)
- include/pika_consensus.h (2 hunks)
- include/pika_repl_bgworker.h (2 hunks)
- include/pika_repl_client.h (3 hunks)
- src/net/include/bg_thread.h (3 hunks)
- src/net/src/bg_thread.cc (5 hunks)
- src/pika_repl_bgworker.cc (2 hunks)
- src/pika_repl_client.cc (1 hunks)
Additional comments not posted (14)
include/pika_repl_bgworker.h (1)
31-31: LGTM! Verify the usage of the newWriteDBInSyncWaymethod.The addition of the
WriteDBInSyncWaymethod enhances the functionality of thePikaReplBgWorkerclass.Ensure that the method is correctly utilized in the codebase.
src/net/include/bg_thread.h (3)
55-67: LGTM! Verify the usage of the updatedBGItemclass.The conversion of
BGItemto a class and the addition of a destructor callback enhance its functionality and memory management.Ensure that the class is correctly utilized in the codebase.
Verification successful
LGTM! Verify the usage of the updated
BGItemclass.The conversion of
BGItemto a class and the addition of a destructor callback enhance its functionality and memory management.
BGItemis used in multiple places withinbg_thread.cc, including methods likeSchedule,QueueSize, andSwallowReadyTasks.Ensure that the class is correctly utilized in the codebase.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the updated `BGItem` class. # Test: Search for the class usage. Expect: Correct usage of the updated class. rg --type cpp -A 5 $'BGItem'Length of output: 2886
52-55: LGTM! Verify the usage of the updatedSwallowReadyTasksmethod.The update to use
std::unique_ptr<BGItem>enhances memory management.Ensure that the method is correctly utilized in the codebase.
Verification successful
Verified: The
SwallowReadyTasksmethod is correctly utilized and scoped withinsrc/net/src/bg_thread.cc. The update to usestd::unique_ptr<BGItem>enhances memory management and ensures proper deallocation of resources.
src/net/include/bg_thread.hsrc/net/src/bg_thread.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the updated `SwallowReadyTasks` method. # Test: Search for the method usage. Expect: Correct usage of the updated method. rg --type cpp -A 5 $'SwallowReadyTasks'Length of output: 965
Script:
#!/bin/bash # Description: Verify if there are any additional usages of the `SwallowReadyTasks` method in the codebase. # Test: Search for the method usage in the entire codebase. Expect: Identify all usages of the method. rg --type cpp $'SwallowReadyTasks'Length of output: 199
42-42: LGTM! Verify the usage of the updatedQueueClearmethod.The update to use
std::unique_ptr<BGItem>enhances memory management.Ensure that the method is correctly utilized in the codebase.
src/net/src/bg_thread.cc (3)
106-110: LGTM! Verify the usage of the updatedThreadMainmethod.The update to use
std::unique_ptr<BGItem>enhances memory management.Ensure that the method is correctly utilized in the codebase.
52-55: LGTM! Verify the usage of the updatedSwallowReadyTasksmethod.The update to use
std::unique_ptr<BGItem>enhances memory management.Ensure that the method is correctly utilized in the codebase.
Verification successful
Verification Successful!
The update to use
std::unique_ptr<BGItem>in theSwallowReadyTasksmethod is correctly implemented and does not introduce any issues. The method is only referenced within the same file where it is defined and declared.
src/net/include/bg_thread.hsrc/net/src/bg_thread.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the updated `SwallowReadyTasks` method. # Test: Search for the method usage. Expect: Correct usage of the updated method. rg --type cpp -A 5 $'SwallowReadyTasks'Length of output: 965
Script:
#!/bin/bash # Description: Perform a comprehensive search for the usage of the `SwallowReadyTasks` method in the entire codebase. # Test: Search for any references to `SwallowReadyTasks` across the codebase. rg --type cpp 'SwallowReadyTasks'Length of output: 199
42-42: LGTM! Verify the usage of the updatedQueueClearmethod.The update to use
std::unique_ptr<BGItem>enhances memory management.Ensure that the method is correctly utilized in the codebase.
Verification successful
Verify the usage of the updated
QueueClearmethod in example files.The update to use
std::unique_ptr<BGItem>enhances memory management. Ensure that the method is correctly utilized in the example files.
Gather more context around the
QueueClearreferences in example files.The current context is insufficient to confirm correct usage. Gather additional lines around the
QueueClearreferences to ensure proper utilization.
The
QueueClearmethod is correctly utilized in the codebase.The method is used appropriately in the example files, ensuring proper memory management with
std::unique_ptr<BGItem>.
src/net/examples/thread_pool_test.ccsrc/net/examples/bg_thread.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the updated `QueueClear` method. # Test: Search for the method usage. Expect: Correct usage of the updated method. rg --type cpp -A 5 $'QueueClear'Length of output: 1231
Script:
#!/bin/bash # Description: Verify the usage of the updated `QueueClear` method in example files. # Check the context of the references in the example files to ensure they correctly use the updated method. rg --type cpp -A 10 'QueueClear' src/net/examples/thread_pool_test.cc rg --type cpp -A 10 'QueueClear' src/net/examples/bg_thread.ccLength of output: 320
Script:
#!/bin/bash # Description: Gather more context around the `QueueClear` references in example files. # Check the context of the references in the example files to ensure they correctly use the updated method. rg --type cpp -A 20 -B 10 'QueueClear' src/net/examples/thread_pool_test.cc rg --type cpp -A 20 -B 10 'QueueClear' src/net/examples/bg_thread.ccLength of output: 1026
include/pika_repl_client.h (2)
47-48: Constructor change approved.The constructor of
ReplClientWriteDBTaskArghas been simplified, making it more maintainable.
67-67: Method signature change approved.The method signature for
ScheduleWriteDBTaskhas been altered to take aCmdpointer and a callback function, enhancing flexibility in task execution and completion handling.Ensure that the callback function is properly utilized in the codebase.
Verification successful
Method signature change approved.
The method signature for
ScheduleWriteDBTaskhas been altered to take aCmdpointer and a callback function, enhancing flexibility in task execution and completion handling.The callback function is utilized properly in the following instances:
src/pika_rm.ccsrc/pika_consensus.ccsrc/pika_repl_client.ccNo further issues found.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the `ScheduleWriteDBTask` method in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp --type c++ -A 5 $'ScheduleWriteDBTask'Length of output: 79
Script:
#!/bin/bash # Description: Verify the usage of the `ScheduleWriteDBTask` method in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp -A 5 $'ScheduleWriteDBTask'Length of output: 2587
include/pika_consensus.h (3)
167-175: Methods for incrementing and decrementing the counter approved.The methods
IncrUnfinishedAsyncWriteDbTaskCountandDecrUnfinishedAsyncWriteDbTaskCountensure thread safety and correctness in the counter operations, with logging providing visibility into the state of the counter.
212-216: Atomic counter member addition approved.The member
unfinished_async_write_db_task_count_is an atomic integer initialized to zero, playing a crucial role in managing asynchronous write operations.
183-183: Method signature change approved.The method signature for
InternalApplyFollowerhas been modified to accept aCmdpointer and a callback function, allowing for more flexible callback mechanisms during the log application process.Ensure that the callback function is properly utilized in the codebase.
Verification successful
Method signature change approved.
The method signature for
InternalApplyFollowerhas been modified to accept aCmdpointer and a callback function, allowing for more flexible callback mechanisms during the log application process.The callback function is properly utilized in the codebase.
InternalApplyFollowermethod insrc/pika_consensus.ccScheduleWriteDBTaskmethod insrc/pika_repl_client.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the `InternalApplyFollower` method in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp --type c++ -A 5 $'InternalApplyFollower'Length of output: 81
Script:
#!/bin/bash # Description: Verify the usage of the `InternalApplyFollower` method in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp -A 5 $'InternalApplyFollower'Length of output: 1644
Script:
#!/bin/bash # Description: Verify the usage of the callback function in `ScheduleWriteDBTask`. # Test: Search for the implementation of `ScheduleWriteDBTask` and ensure the callback function is utilized. rg --type cpp -A 10 $'ScheduleWriteDBTask'Length of output: 4264
src/pika_repl_bgworker.cc (2)
215-215: Method addition for synchronous database writing approved.The
WriteDBInSyncWaymethod facilitates synchronous database writing, improving consistency and reliability in database interactions.Ensure that the method is correctly implemented and utilized in the codebase.
Verification successful
The
WriteDBInSyncWaymethod is correctly implemented and utilized in the codebase.The method
WriteDBInSyncWayis defined insrc/pika_repl_bgworker.ccand is utilized in bothsrc/pika_consensus.ccand within its own class insrc/pika_repl_bgworker.cc.
- Implementation:
src/pika_repl_bgworker.cc- Usage:
src/pika_consensus.ccsrc/pika_repl_bgworker.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the `WriteDBInSyncWay` method in the codebase. # Test: Search for the method usage. Expect: Correct implementation and utilization. rg --type cpp --type c++ -A 5 $'WriteDBInSyncWay'Length of output: 76
Script:
#!/bin/bash # Description: Verify the usage of the `WriteDBInSyncWay` method in the codebase. # Test: Search for the method usage. Expect: Correct implementation and utilization. rg --type cpp -A 5 $'WriteDBInSyncWay'Length of output: 1255
35-37: Method overload with callback parameter approved.The
Schedulemethod has been overloaded to include a callback function parameter, enhancing flexibility in task scheduling by enabling post-execution actions.Ensure that the callback function is properly utilized in the codebase.
Verification successful
Method overload with callback parameter approved.
The
Schedulemethod has been overloaded to include a callback function parameter, enhancing flexibility in task scheduling by enabling post-execution actions. The callback functionality is properly utilized in the codebase.
src/pika_repl_client.ccsrc/pika_repl_bgworker.ccsrc/pika_rm.ccsrc/pika_consensus.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of the overloaded `Schedule` method with callback parameter in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp --type c++ -A 5 $'Schedule'Length of output: 68
Script:
#!/bin/bash # Description: Verify the usage of the overloaded `Schedule` method with callback parameter in the codebase. # Test: Search for the method usage. Expect: Proper utilization of the callback function. rg --type cpp -A 5 $'Schedule'Length of output: 29755
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Files selected for processing (4)
- include/pika_consensus.h (2 hunks)
- include/pika_repl_client.h (3 hunks)
- src/pika_consensus.cc (2 hunks)
- src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (2)
- include/pika_consensus.h
- include/pika_repl_client.h
Additional comments not posted (3)
src/pika_consensus.cc (2)
349-357: Ensure consistency in command processing.The changes correctly handle the
flushdbcommand by checking the command type and managing asynchronous write tasks. Ensure that all other command types are processed correctly and consistently.
428-429: LGTM! Ensure proper callback handling.The changes correctly modify the function to accept a
std::shared_ptr<Cmd>and a callback function. Ensure that the callback function is handled properly and that resources are managed correctly.src/pika_rm.cc (1)
686-687: Ensure proper resource management with callback functions.The changes correctly modify the function to accept a
std::shared_ptr<Cmd>and a callback function. Ensure that the callback function is handled properly and that resources are managed correctly.
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Files selected for processing (2)
- include/pika_rm.h (1 hunks)
- src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/pika_rm.cc
Additional context used
Learnings (1)
include/pika_rm.h (1)
Learnt from: cheniujh PR: OpenAtomFoundation/pika#2808 File: src/pika_repl_client.cc:105-106 Timestamp: 2024-07-29T12:30:54.488Z Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (1)
include/pika_rm.h (1)
187-187: LGTM! Verify the method usage in the codebase.The change to use a
std::function<void()>callback function in theScheduleWriteDBTaskmethod signature is approved.However, ensure that all calls to
ScheduleWriteDBTaskare updated to match the new signature.Verification successful
The method signature change has been correctly implemented.
The
ScheduleWriteDBTaskmethod's new signature withstd::function<void()>& call_back_funis consistently used across the codebase.
src/pika_rm.ccsrc/pika_repl_client.ccsrc/pika_consensus.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all calls to `ScheduleWriteDBTask` match the new signature. # Test: Search for the method usage. Expect: Only occurrences of the new signature. rg --type cpp -A 5 $'ScheduleWriteDBTask'Length of output: 2587
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2 renamed 2 functions
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Files selected for processing (10)
- include/pika_consensus.h (1 hunks)
- include/pika_repl_bgworker.h (2 hunks)
- include/pika_repl_client.h (4 hunks)
- include/pika_rm.h (2 hunks)
- src/net/include/bg_thread.h (3 hunks)
- src/net/src/bg_thread.cc (5 hunks)
- src/pika_consensus.cc (2 hunks)
- src/pika_repl_bgworker.cc (2 hunks)
- src/pika_repl_client.cc (2 hunks)
- src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (7)
- include/pika_consensus.h
- include/pika_repl_bgworker.h
- include/pika_rm.h
- src/net/src/bg_thread.cc
- src/pika_repl_bgworker.cc
- src/pika_repl_client.cc
- src/pika_rm.cc
Additional context used
Learnings (1)
include/pika_repl_client.h (1)
Learnt from: cheniujh PR: OpenAtomFoundation/pika#2808 File: src/pika_repl_client.cc:105-106 Timestamp: 2024-07-29T12:30:54.488Z Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (10)
src/net/include/bg_thread.h (3)
44-44: LGTM! But verify the method usage in the codebase.The new method signature with a callback parameter enhances the scheduling functionality.
However, ensure that all invocations of
Scheduleare updated to use the new signature if applicable.
55-67: LGTM! But verify the class usage in the codebase.The transformation of
BGIteminto a class with a destructor callback enhances resource management.However, ensure that all instances of
BGItemare updated to use the new class if applicable.
70-70: LGTM! But verify the member usage in the codebase.The change to store
std::unique_ptr<BGItem>in thequeue_member enhances memory management.However, ensure that all usages of the
queue_member are updated to handlestd::unique_ptr<BGItem>if applicable.Verification successful
Verified: The
queue_member correctly handlesstd::unique_ptr<BGItem>.The usages of
queue_inbg_thread.ccare correctly updated to handlestd::unique_ptr<BGItem>, ensuring proper memory management and ownership semantics.
queue_.emplace(std::make_unique<BGItem>(...))is used to add items to the queue.queue_.pop()is used to remove items from the queue, transferring ownership.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all usages of the `queue_` member with `std::unique_ptr<BGItem>`. # Test: Search for the member usage. Expect: Occurrences of `std::unique_ptr<BGItem>`. rg --type cpp -A 5 $'queue_'Length of output: 85856
Script:
#!/bin/bash # Description: Verify correct handling of `std::unique_ptr<BGItem>` in the `queue_` member. # Test: Search for `queue_` usage and ensure `std::unique_ptr` semantics are correctly applied. rg --type cpp -A 5 'queue_\.push\(' rg --type cpp -A 5 'queue_\.emplace\(' rg --type cpp -A 5 'queue_\.pop\('Length of output: 9479
include/pika_repl_client.h (5)
47-48: LGTM! But verify the struct usage in the codebase.The simplification of the constructor reduces complexity and improves readability.
However, ensure that all instances of
ReplClientWriteDBTaskArgare updated to use the new constructor if applicable.Verification successful
LGTM!
The simplification of the constructor reduces complexity and improves readability. All instances of
ReplClientWriteDBTaskArghave been updated to use the new constructor.
src/pika_repl_client.cc: The new constructor is used correctly.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all instances of the `ReplClientWriteDBTaskArg` struct with the new constructor. # Test: Search for the struct usage. Expect: Occurrences of the new constructor. rg --type cpp -A 5 $'ReplClientWriteDBTaskArg('Length of output: 149
Script:
#!/bin/bash # Description: Verify all instances of the `ReplClientWriteDBTaskArg` struct with the new constructor. # Test: Search for the struct usage. Expect: Occurrences of the new constructor. rg --type cpp -A 5 $'ReplClientWriteDBTaskArg\\('Length of output: 992
67-67: LGTM! But verify the method usage in the codebase.The simplification of the method signature potentially enhances the execution flow.
However, ensure that all invocations of
ScheduleWriteDBTaskare updated to use the new signature if applicable.Verification successful
LGTM! The method
ScheduleWriteDBTaskhas been updated across the codebase to use the new signature.The simplification of the method signature potentially enhances the execution flow. All invocations of
ScheduleWriteDBTaskhave been updated to use the new signature.
src/pika_repl_client.ccsrc/pika_consensus.ccsrc/pika_rm.ccScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all invocations of the `ScheduleWriteDBTask` method with the new signature. # Test: Search for the method usage. Expect: Occurrences of the new signature. rg --type cpp -A 5 $'ScheduleWriteDBTask('Length of output: 134
Script:
#!/bin/bash # Description: Verify all invocations of the `ScheduleWriteDBTask` method with the new signature. # Test: Search for the method usage. Expect: Occurrences of the new signature. rg --type cpp -A 5 $'ScheduleWriteDBTask\\('Length of output: 2416
91-95: LGTM! But verify the method usage in the codebase.The method uses atomic operations to ensure thread safety when retrieving the task count.
However, ensure that all invocations of
GetUnfinishedAsyncWriteDBTaskCountare correct and consistent.
79-83: LGTM! But verify the method usage in the codebase.The method uses atomic operations to ensure thread safety when incrementing the task count.
However, ensure that all invocations of
IncrAsyncWriteDBTaskCountare correct and consistent.Verification successful
Let's correct the regex pattern and re-run the search for the method usage.
Let's correct the regex pattern again and ensure there are no syntax errors this time.
Verification successful!
The method
IncrAsyncWriteDBTaskCountis used correctly in the codebase.
src/pika_repl_client.cc: The method is invoked to increment the task count.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 $'IncrAsyncWriteDBTaskCount('Length of output: 152
Script:
#!/bin/bash # Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 'IncrAsyncWriteDBTaskCount('Length of output: 152
Script:
#!/bin/bash # Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 'IncrAsyncWriteDBTaskCount\('Length of output: 970
85-89: LGTM! But verify the method usage in the codebase.The method uses atomic operations to ensure thread safety when decrementing the task count.
However, ensure that all invocations of
DecrAsyncWriteDBTaskCountare correct and consistent.Verification successful
LGTM! But verify the method usage in the codebase.
The method
DecrAsyncWriteDBTaskCountis used correctly within a lambda function insrc/pika_repl_client.cc. The lambda function is assigned totask_finish_call_backand scheduled to be executed by a worker thread, ensuring that the task count is decremented appropriately.
src/pika_repl_client.cc: The method is used within a lambda function assigned totask_finish_call_back.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 $'DecrAsyncWriteDBTaskCount('Length of output: 152
Script:
#!/bin/bash # Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 'DecrAsyncWriteDBTaskCount('Length of output: 152
Script:
#!/bin/bash # Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 'DecrAsyncWriteDBTaskCount\('Length of output: 930
src/pika_consensus.cc (2)
426-427: LGTM! But verify the method usage in the codebase.The modification of the method signature enhances the capability for managing asynchronous tasks.
However, ensure that all invocations of
InternalApplyFollowerare updated to use the new signature if applicable.Verification successful
The method signature update for
InternalApplyFollowerhas been correctly propagated.The search results confirm that the method invocation in
src/pika_consensus.ccuses the new signature, and no other invocations were found that need updating.
include/pika_consensus.h: Method signature updated.src/pika_consensus.cc: Method implementation and invocation updated.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all invocations of the `InternalApplyFollower` method with the new signature. # Test: Search for the method usage. Expect: Occurrences of the new signature. rg --type cpp -A 5 $'InternalApplyFollower('Length of output: 140
Script:
#!/bin/bash # Description: Verify all invocations of the `InternalApplyFollower` method with the new signature. # Test: Search for the method usage. Expect: Occurrences of the new signature. rg --type cpp -A 5 'InternalApplyFollower\('Length of output: 1528
349-368: LGTM! But verify the method usage in the codebase.The changes improve the control flow and logic of command processing, ensuring data consistency during flush operations.
However, ensure that all invocations of
ProcessLeaderLogare correct and consistent with the new logic.Verification successful
Let's correct the regex pattern and search for both the definition and invocations of the
ProcessLeaderLogmethod.
Let's correct the regex pattern by escaping the parentheses and search again for both the definition and invocations of the
ProcessLeaderLogmethod.
Let's extract the relevant lines around the invocations of the
ProcessLeaderLogmethod to verify their consistency with the new logic.
The invocations of
ProcessLeaderLogare consistent with the new logic.The method is invoked in
src/pika_rm.ccandsrc/pika_repl_bgworker.ccin a manner that aligns with the updated control flow and logic for handlingflushdbcommands.
src/pika_rm.cc: The invocation is straightforward and directly callsProcessLeaderLog.src/pika_repl_bgworker.cc: The invocation is part of a larger function handling background worker tasks, and it correctly integrates the new logic.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify all invocations of the `ProcessLeaderLog` method with the new logic. # Test: Search for the method usage. Expect: Occurrences of the method. rg --type cpp -A 5 $'ProcessLeaderLog('Length of output: 125
Script:
#!/bin/bash # Description: Verify the definition and invocations of the `ProcessLeaderLog` method. # Search for the method definition. rg --type cpp -A 5 'void ProcessLeaderLog(' # Search for the method invocations. rg --type cpp -A 5 'ProcessLeaderLog('Length of output: 266
Script:
#!/bin/bash # Description: Verify the definition and invocations of the `ProcessLeaderLog` method. # Search for the method definition. rg --type cpp -A 5 'void ProcessLeaderLog\(' # Search for the method invocations. rg --type cpp -A 5 'ProcessLeaderLog\('Length of output: 2369
Script:
#!/bin/bash # Extract relevant lines around the invocations of the `ProcessLeaderLog` method. # Extract lines around the invocation in src/pika_rm.cc rg --type cpp -A 10 -B 10 'ProcessLeaderLog\(' src/pika_rm.cc # Extract lines around the invocation in src/pika_repl_bgworker.cc rg --type cpp -A 10 -B 10 'ProcessLeaderLog\(' src/pika_repl_bgworker.ccLength of output: 1596
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Files selected for processing (1)
- include/pika_consensus.h (2 hunks)
Files skipped from review as they are similar to previous changes (1)
- include/pika_consensus.h
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Files selected for processing (4)
- include/pika_repl_client.h (4 hunks)
- include/pika_rm.h (2 hunks)
- src/pika_consensus.cc (2 hunks)
- src/pika_repl_client.cc (2 hunks)
Files skipped from review as they are similar to previous changes (2)
- include/pika_rm.h
- src/pika_repl_client.cc
Additional context used
Learnings (1)
include/pika_repl_client.h (1)
Learnt from: cheniujh PR: OpenAtomFoundation/pika#2808 File: src/pika_repl_client.cc:105-106 Timestamp: 2024-07-29T12:30:54.488Z Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (8)
include/pika_repl_client.h (6)
47-48: Constructor simplification looks good.The constructor now only accepts a
std::shared_ptr<Cmd>, simplifying the task creation process.
67-67: Method signature update looks good.The
ScheduleWriteDBTaskmethod now accepts astd::shared_ptr<Cmd>and astd::stringfor thedb_name, aligning with the constructor simplification inReplClientWriteDBTaskArg.
79-83: Increment method looks good.The
IncrAsyncWriteDBTaskCountmethod uses atomic operations to increment the count of asynchronous write tasks, ensuring thread safety.
85-89: Decrement method looks good.The
DecrAsyncWriteDBTaskCountmethod uses atomic operations to decrement the count of asynchronous write tasks, ensuring thread safety.
91-95: Get count method looks good.The
GetUnfinishedAsyncWriteDBTaskCountmethod uses atomic operations to retrieve the count of unfinished asynchronous write tasks, ensuring thread safety.
111-112: Destructor order comment looks good.The comment ensures that
write_db_workers_are destroyed beforeasync_write_db_task_counts_to avoid issues with async tasks manipulating the counts.src/pika_consensus.cc (2)
426-427: Method signature update looks good.The
InternalApplyFollowermethod now accepts astd::shared_ptr<Cmd>, enhancing its capability for managing asynchronous tasks.
349-368: Conditional structure forflushdb-binloglooks good.The method ensures that all prior write tasks are completed before executing the
flushdboperation, maintaining data consistency.However, ensure that the wait mechanism is efficient and does not cause unnecessary delays.
Verification successful
Conditional structure for
flushdb-binloglooks good.The method ensures that all prior write tasks are completed before executing the
flushdboperation, maintaining data consistency. The wait mechanism appears to be efficient by exponentially increasing the wait time until it reaches a maximum of 3000 milliseconds.
src/pika_consensus.cc(lines 349-368)However, ensure that the wait mechanism is efficient and does not cause unnecessary delays in a real-world scenario.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the efficiency of the wait mechanism in the `ProcessLeaderLog` method. # Test: Search for the wait mechanism. Expect: Efficient waiting without unnecessary delays. rg --type cpp -A 10 $'while (g_pika_rm->GetUnfinishedAsyncWriteDBTaskCount(db_name_) > 0)'Length of output: 91
Script:
#!/bin/bash # Description: Verify the efficiency of the wait mechanism in the `ProcessLeaderLog` method. # Test: Search for the wait mechanism. Expect: Efficient waiting without unnecessary delays. # Adjust the search to include more context lines and ensure we capture the relevant code. rg --type cpp -A 20 'while (g_pika_rm->GetUnfinishedAsyncWriteDBTaskCount(db_name_) > 0)'Length of output: 91
Script:
#!/bin/bash # Description: Locate the implementation of the `ProcessLeaderLog` method to verify the wait mechanism. # Search for the `ProcessLeaderLog` method definition in the codebase. rg --type cpp 'ProcessLeaderLog'Length of output: 711
Script:
#!/bin/bash # Description: Locate the implementation of the `ProcessLeaderLog` method in `src/pika_consensus.cc` to verify the wait mechanism. # Search for the `ProcessLeaderLog` method definition and implementation in `src/pika_consensus.cc`. rg --type cpp -A 50 'ProcessLeaderLog' src/pika_consensus.ccLength of output: 2089
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Files selected for processing (3)
- src/pika_consensus.cc (2 hunks)
- src/pika_repl_client.cc (2 hunks)
- src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/pika_consensus.cc
Additional context used
Learnings (2)
src/pika_repl_client.cc (1)
Learnt from: cheniujh PR: OpenAtomFoundation/pika#2808 File: src/pika_repl_client.cc:105-106 Timestamp: 2024-07-29T12:30:54.488Z Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.src/pika_rm.cc (1)
Learnt from: cheniujh PR: OpenAtomFoundation/pika#2808 File: src/pika_repl_client.cc:105-106 Timestamp: 2024-07-29T12:30:54.488Z Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (1)
src/pika_rm.cc (1)
686-687: LGTM!The code changes are approved. The method now properly delegates the task scheduling to
PikaReplClient::ScheduleWriteDBTask.
* add comment to explain the idea * add mtx and waiting for test * use lockfree implementation, some logs are waiting to remove * change the call_back to an optional dtor call back of BGItem * revised based on reviewer's opinion * removed some comments * change the declared position of async_write_db_task_count --------- Co-authored-by: Xin.Zh <alexstocks@foxmail.com>
fix Issue #2708
discussion #2807
问题简述：因为Slave端消费Binlog线程模型的缘故，原有代码中主从执行flushdb后可能出现主从不一致的现象
背景：Pika Slave在消费一条Binlog时，按事件顺序分为两步，一是同步Apply Binlog, 也就是将收到的Binlog也追加到自己的BinlogFile中，二是异步多线程Apply DB, 也即将Binlog中抽取出来的命令写DB。具体地，Slave收到的所有Binlog都会顺序提交到一个固定的Binlog-Worker线程去消费，在这个Binlog-Worker线程上，会原地完成Apply Binlog的动作（同步地追加Binlog），之后会向另外一个WriteDBWorker线程池提交一个异步的WriteDB任务（按key来做hash决定使用池子里的哪一个DBworker）。长话短说就是：写Binlog的动作是单线程同步完成的，而写完Binlog之后，从Binlog中提取的WriteDB任务是提交到另一个线程池异步并发做的，并且按照key hash来选择worker thread。 问题就在于：Flushdb这样的命令没有key，按照这样的执行方式根本无法在slave保证正确的执行顺序。
Case举例：
解决方案：
必须确保flushdb命令之后的Binlog一定在flushdb执行完之后才被消费。具体变动为：消费flushdb的Binlog时，将写Binlog以及WriteDB两个操作都放在WriteBinlogWorker上同步执行（原本是只有写Binlog任务在这里同步执行，WriteDB任务被分发到DBWorker线程池），说白了就是flushdb特殊化一下，WriteDB的动作从异步改为同步。修改之后：能确保位于flushdb命令之后的Binlog不可能在flushdb执行完毕之前被提交到异步的DBWorker池子里，也就不可能会比flushdb更早执行。
必须确保flushdb命令在真正执行之前，位于flushdb之前的所有WriteDB任务都已经完成了（操作已经写入RocksDB, 而不是还在某个WriteDBWorker的任务队列中排队）。具体变动为：在BinlogWorker上新增一个提交计数/正在异步执行的WriteDB任务的计数。每次BinlogWorker向WriteDBWorker池子中提交WriteDB任务时，都对这个计数加1，每当有相应的WriteDB任务完成，都对这个计数减1（加一个回调函数即可）。在消费到flushdb的binlog时，需要在BinlogWorker上将flushdb进行同步地WriteDB前，需要先检查这个任务计数是否为0，如果不为0，就sleep一会（等待前面的异步WriteDB任务被执行完），再次检查该计数，一直等到该任务计数归0，才去原地将flushdb的操作apply到DB。（为什么这个任务计数一定能等到归0：这个任务计数只有在BinlogWorker向WriteDBWorker池子异步提交任务时才会做自增，而这里的sleep等待实际上就是BinlogWorker在等待，换而言之，在这条同步消费的flushdb完全完成之前，下一条Binlog都不会被消费，也不会有任何的WriteDB任务被提交到WriteDBWoker的池子）。修改之后: 能确保flushdb之前的Binlog所对应的WriteDB任务一定都执行完了，才会执行flushdb，能避免出现：执行完flushdb之后（即写了binlog，也已经清空了DB），滞留在WriteDBWorker队列中的WriteDB任务才执行（即先于flushdb的命令在flushdb之后才执行)。
Problem Summary: Due to the Slave end's Binlog consumption thread model, executing flushdb on both master and slave in the original code may result in inconsistencies between master and slave.
Background: When Pika Slave consumes a Binlog, it follows two steps in order: first, Apply Binlog, which appends the received Binlog to its own BinlogFile; second, Apply DB, which extracts the commands from the Binlog and writes them to the DB. Specifically, all Binlogs received by the Slave are sequentially submitted to a fixed Binlog-Worker thread for consumption. On the Binlog-Worker thread, the Apply Binlog action (synchronously appending the Binlog) is completed in place. Subsequently, an asynchronous WriteDB task is submitted to another WriteDBWorker thread pool (the specific DBworker in the pool is assigned based on the key). In short: the Binlog writing action is completed synchronously by a single thread, while the WriteDB tasks extracted from the Binlog are submitted to another thread pool for asynchronous concurrent execution.
Example Case:
Solution:
Ensure that Binlogs after the flushdb command are not consumed until flushdb is executed. Specifically: when consuming the flushdb Binlog, both the Binlog writing and the WriteDB operations are performed synchronously on the WriteBinlogWorker (originally only the Binlog writing task was done synchronously here, while the WriteDB task was dispatched to the DBWorker thread pool). Simply put, flushdb is treated specially, changing the WriteDB action from asynchronous to synchronous. After the change: it ensures that Binlogs following the flushdb command cannot be submitted to the asynchronous DBWorker pool before flushdb is completed, and thus cannot be executed earlier than flushdb.
Ensure that before the flushdb command is actually executed, all WriteDB tasks prior to flushdb have been completed (operations have been written to RocksDB, not just queued in some WriteDBWorker's task queue). Specifically: add a counter for submitted/ongoing asynchronous WriteDB tasks on the BinlogWorker. Each time the BinlogWorker submits a WriteDB task to the WriteDBWorker pool, this counter is incremented by 1. When a corresponding WriteDB task is completed, the counter is decremented by 1 (adding a callback function). When consuming the flushdb Binlog, before synchronously executing WriteDB for flushdb on the BinlogWorker, it needs to check if this task count is 0. If not, it sleeps for a while (waiting for the previous asynchronous WriteDB tasks to complete), then rechecks the count, and waits until this task count reaches 0 before applying the flushdb operation to the DB in place. (Why this task count can definitely reach 0: this task count only increments when the BinlogWorker submits tasks asynchronously to the WriteDBWorker pool. The sleep wait here means the BinlogWorker is waiting. In other words, before this synchronous flushdb consumption is fully completed, the next Binlog will not be consumed, and no WriteDB task will be submitted to the WriteDBWorker pool). After the change: it ensures that all WriteDB tasks corresponding to Binlogs before flushdb are completed before executing flushdb, avoiding the situation where: after executing flushdb (i.e., writing the Binlog and clearing the DB), the WriteDB tasks remaining in the WriteDBWorker queue are executed (i.e., commands prior to flushdb are executed after flushdb).
Summary by CodeRabbit
New Features
Bug Fixes
Refactor
Performance Improvements