README.md

说明:

MongoDB是一个基于分布式文件存储的数据库。由C++语言编写。旨在为WEB应用提供可扩展的高性能数据存储解决方案。
是一个介于关系数据库和非关系数据库之间的产品，是非关系数据库当中功能最丰富，最像关系数据库的。他支持的数据结构非常松散，是类似json的bson格式，因此可以存储比较复杂的数据类型。Mongo最大的特点是他支持的查询语言非常强大，其语法有点类似于面向对象的查询语言，几乎可以实现类似关系数据库单表查询的绝大部分功能，而且还支持对数据建立索引。

源码中文已注释代码列表如下：

boost-asio网络库/定时器源码实现注释(只注释mongodb相关实现的asio库代码)(100%注释):

• asio/include/asio/detail/impl/scheduler.ipp
• asio/include/asio/detail/impl/epoll_reactor.ipp
• asio/include/asio/detail/scheduler.hpp
• asio/include/asio/detail/impl/scheduler.hpp
• asio/include/asio/detail/timer_queue.hpp
• asio/include/asio/detail/timer_queue_base.hpp
• asio/include/asio/detail/timer_queue_set.hpp
• asio/include/asio/detail/impl/timer_queue_set.ipp
• asio/include/asio/detail/epoll_reactor.hpp
• asio/include/asio/detail/impl/epoll_reactor.hpp
• asio/include/asio/impl/read.hpp
• asio/include/asio/impl/write.hpp
• asio/include/asio/basic_socket_acceptor.hpp
• asio/include/asio/detail/reactive_socket_service.hpp)
• asio/include/asio/basic_socket_acceptor.hpp
• asio/include/asio/basic_stream_socket.hpp
• asio/include/asio/detail/reactive_socket_service_base.hpp
• asio/include/asio/detail/reactive_socket_recv_op.hpp
• asio/include/asio/detail/reactor_op.hpp
• asio/include/asio/detail/scheduler_operation.hpp
• asio/include/asio/detail/deadline_timer_service.hpp

mongodb网络传输模块(transport)处理实现(100%注释):

transport_layer传输层子模块:

• transport_layer_asio.h
• transport_layer_asio.cpp
• transport_layer_manager.h
• transport_layer_manager.cpp
• transport_layer.h

Ticket数据收发回调处理子模块(100%注释):

• ticket_asio.h
• ticket_asio.cpp
• ticket_impl.h

Session会话子模块(100%注释):

• session_asio.h
• session_asio.cpp
• session.h

service_state_machine状态机子模块(100%注释):

• service_state_machine.h
• service_state_machine.cpp

service_executor服务运行(工作线程模型)子模块(100%注释):

• service_executor.h
• service_executor_adaptive.cpp
• service_executor_adaptive.h
• service_executor_synchronous.cpp
• service_executor_synchronous.h

service_entry_point_impl服务入口子模块(100%注释):

• service_entry_point.h
• service_entry_point_impl.cpp
• service_entry_point_impl.h
• service_entry_point_utils.cpp
• service_entry_point_utils.h

message/DbMessage/OpMsgRequest协议处理(100%注释):

• message.h
• message.cpp
• dbmessage.h
• dbmessage.cpp
• factory.cpp
• factory.h
• op_msg.cpp
• op_msg.h

时间嘀嗒及系统级定时器实现(100%注释):

• tick_source.h
• system_tick_source.cpp
• system_tick_source.h
• timer.cpp
• timer.h

mongod/mongos服务入口处理(100%注释):

• service_entry_point_mongod.h
• service_entry_point_mongod.cpp
• service_entry_point_mongos.h
• service_entry_point_mongos.cpp

command命令处理模块(注释完毕,命令太多，请参考前面的《command命令处理模块源码实现》):

• commands.h
• commands.cpp
• write_commands.cpp
• cluster_write_cmd.cpp
• strategy.cpp

db.serverStatus()相关统计(注释完毕):

• server_status.cpp
• server_status.h
• server_status_internal.cpp
• server_status_internal.h
• server_status_metric.cpp
• server_status_metric.h

stats相关统计(注释完毕):

• counters.cpp
• counters.h
• operation_latency_histogram.cpp
• operation_latency_histogram.h
• top.cpp
• top.h
• latency_server_status_section.cpp
• toplatency_server_status_sectionh

OpMsgRequest和写write_ops:(insert、update、delete)转换操作(100%注释): :

• write_ops_gen.cpp
• write_ops_gen.h

write写模块:

write处理入口(100%注释):

• write_commands_common.cpp
• write_commands_common.h
• write_commands.h

OpMsgRequest和写write_ops:(insert、update、delete)转换操作(100%注释): :

• write_ops_parsers.cpp
• write_ops_parsers.h
• write_ops_gen.cpp
• write_ops_gen.h

增删改处理(100%注释): :

• write_ops_exec.cpp
• write_ops_exec.h

query请求处理模块:

query_request请求解析和canonical_query规范化转换操作(核心流程注释完毕):

• query_request.cpp
• query_request.h
• canonical_query.cpp
• canonical_query.h
• parsed_projection.cpp
• parsed_projection.h

MatchExpression tree生成及优化过程(核心流程注释完毕):

• expression_parser.cpp
• expression_parser.h
• expression.cpp
• expression.h
• expression_tree.cpp
• expression_tree.h

get_executor获取PlanExecutor(核心流程注释完毕):

• get_executor.cpp
• get_executor.h

QueryPlannerIXSelect实现MatchExpression tree相关node关联对应RelevantTag(核心流程注释完毕):

• planner_ixselect.cpp
• planner_ixselect.h

plan_enumerator轮询枚举每个查询所有的候选索引信息(核心流程注释完毕):

• plan_enumerator.cpp
• plan_enumerator.h

index_tag相关(核心流程注释完毕):

• index_tag.cpp
• index_tag.h

生成QuerySolutionNode tree及querysolution(核心流程注释完毕):

• planner_access.cpp
• planner_access.h
• planner_analysis.cpp
• planner_analysis.h
• query_planner.cpp
• query_planner.h

get_executor根据querysolurion生成PlanStage(核心流程注释完毕):

• get_executor.cpp
• get_executor.h

PlanStage(核心流程注释完毕):

• plan_stage.cpp
• plan_stage.h
• plan_stats.cpp
• plan_stats.h
• stage_builder.cpp
• stage_builder.h
• multi_plan.cpp
• multi_plan.h
• subplan.cpp
• subplan.h
• stage_types.cpp
• collection_scan.h
• collection_scan.cpp
• collection_scan.h
• index_scan.cpp
• index_scan.h
• fetch.cpp
• fetch.h
• sort.cpp
• sort.h
• sort_key_generator.cpp
• sort_key_generator.h
• projection.cpp
• projection.h
• limit.cpp
• limit.h
• skip.cpp
• skip.h
• cached_plan.cpp
• cached_plan.h
• update.cpp
• update.h
• delete.cpp
• delete.h
• ......

storage存储模块:

catalog中间层相关实现:

database中间层接口相关(重要接口注释):

• database.cpp
• database.h
• database_impl.h
• database_impl.cpp
• database_holder.h
• database_holder.cpp
• database_holder_impl.cpp
• database_holder_impl.h
• database_catalog_entry.h (通过这里和KVStorageEngine关联)

collection中间层接口相关(重要接口注释):

• collection.cpp
• collection.h
• collection_impl.h
• collection_impl.cpp
• collection_info_cache.h
• collection_info_cache.cpp
• collection_info_cache_impl.cpp
• collection_info_cache_impl.h
• collection_options.cpp
• collection_options.h
• collection_catalog_entry.h (通过这里和KVStorageEngine关联)

index中间层接口相关(重要接口注释):

• index_catalog.cpp
• index_catalog.h
• index_catalog_impl.h
• index_catalog_impl.cpp
• index_catalog_entry.h
• index_catalog_entry.cpp
• index_catalog_entry_impl.cpp
• index_catalog_entry_impl.h (通过这里和CollectionInfoCache、CollectionCatalogEntry、IndexAccessMethod等关联)
• index_create.cpp
• index_create.h
• index_create_impl.cpp
• index_create_impl.h

storage层相关实现(重要接口注释):

• record_data.cpp
• record_data.h
• record_store.h
• sorted_data_interface.h
• storage_engine.h
• storage_engine_lock_file.cpp
• storage_engine_lock_file.h
• storage_engine_metadata.cpp
• storage_engine_metadata.h
• storage_init.cpp
• storage_options.h
• storage_options.cpp

kv引擎管理注册(重要接口注释):

• kv_storage_engine.cpp
• kv_storage_engine.h
• kv_catalog.h
• kv_catalog.cpp
• kv_collection_catalog_entry.h(通过这里和catalog中间层collection衔接)
• kv_collection_catalog_entry.cpp
• kv_database_catalog_entry.cpp
• kv_database_catalog_entry.h(通过这里和catalog中间层database衔接)
• kv_database_catalog_entry_base.cpp
• kv_database_catalog_entry_base.h

wiredtiger存储引擎接口相关(重要接口注释):

• wiredtiger_global_options.cpp
• wiredtiger_global_options.h
• wiredtiger_init.h
• wiredtiger_init.cpp
• wiredtiger_kv_engine.h
• wiredtiger_kv_engine.cpp
• wiredtiger_parameters.cpp
• wiredtiger_parameters.h
• wiredtiger_record_store.cpp
• wiredtiger_record_store.h
• wiredtiger_recovery_unit.h
• wiredtiger_recovery_unit.cpp
• wiredtiger_server_status.cpp
• wiredtiger_server_status.h
• wiredtiger_session_cache.cpp
• wiredtiger_session_cache.h
• wiredtiger_size_storer.h
• wiredtiger_size_storer.cpp
• wiredtiger_util.cpp
• wiredtiger_util.h

plan_ranker对每个候选solution打分，选出最优索引(核心流程注释完毕):

• plan_ranker.cpp
• plan_ranker.h

get_executor根据querysolurion生成PlanStage(核心流程注释完毕):

• get_executor.cpp
• get_executor.h

plan_executor执行器(核心流程注释完毕):

• plan_executor.cpp
• plan_executor.h

plan_cache plan缓存(核心流程注释完毕):

• plan_cache.cpp
• plan_cache.h
• plan_cache_commands.cpp
• plan_cache_commands.h

shard分片源码实现(注释进行中):

分布式锁实现源码注释分析(100%注释):

• dist_lock_catalog_impl.cpp
• dist_lock_catalog_impl.h
• dist_lock_manager.cpp
• dist_lock_catalog.h
• dist_lock_catalog_impl.cpp
• dist_lock_catalog_impl.h
• dist_lock_catalog_impl.cpp
• dist_lock_manager.cpp
• type_lockpings.cpp
• type_lockpings.h
• type_locks.cpp
• type_locks.h
• configsvr_enable_sharding_command.h

代理定期更新config.mongos实现源码注释分析(100%注释):

• sharding_uptime_reporter.cpp
• sharding_uptime_reporter.h
• type_mongos.cpp
• type_mongos.h

cfg复制集库表结构管理(config.databases、config.collections)(100%注释):

• type_collection.cpp
• type_collection.h
• type_database.cpp
• type_database.h

分片片建shard key(100%注释):

• shard_key_pattern.cpp
• shard_key_pattern.h
• keypattern.cpp
• keypattern.h