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DeltaMergeStore_Ingest.cpp
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DeltaMergeStore_Ingest.cpp
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// Copyright 2022 PingCAP, Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <Common/FailPoint.h>
#include <Common/TiFlashMetrics.h>
#include <Interpreters/Context.h>
#include <Interpreters/SharedContexts/Disagg.h>
#include <Storages/DeltaMerge/DeltaMergeStore.h>
#include <Storages/DeltaMerge/ExternalDTFileInfo.h>
#include <Storages/DeltaMerge/File/DMFile.h>
#include <Storages/DeltaMerge/Remote/DataStore/DataStore.h>
#include <Storages/DeltaMerge/Remote/ObjectId.h>
#include <Storages/DeltaMerge/Segment.h>
#include <Storages/DeltaMerge/WriteBatchesImpl.h>
#include <Storages/PathPool.h>
#include <Storages/Transaction/CheckpointInfo.h>
#include <Storages/Transaction/FastAddPeer.h>
#include <Storages/Transaction/KVStore.h>
#include <Storages/Transaction/TMTContext.h>
#include <magic_enum.hpp>
namespace CurrentMetrics
{
extern const Metric DT_SnapshotOfSegmentIngest;
}
namespace ProfileEvents
{
extern const Event DMWriteFile;
extern const Event DMWriteFileNS;
} // namespace ProfileEvents
namespace DB
{
namespace FailPoints
{
extern const char pause_when_ingesting_to_dt_store[];
extern const char force_set_segment_ingest_packs_fail[];
extern const char segment_merge_after_ingest_packs[];
extern const char force_ingest_via_delta[];
extern const char force_ingest_via_replace[];
} // namespace FailPoints
namespace DM
{
std::tuple<String, PageIdU64> DeltaMergeStore::preAllocateIngestFile()
{
if (shutdown_called.load(std::memory_order_relaxed))
return {};
auto delegator = path_pool->getStableDiskDelegator();
auto parent_path = delegator.choosePath();
auto new_id = storage_pool->newDataPageIdForDTFile(delegator, __PRETTY_FUNCTION__);
return {parent_path, new_id};
}
void DeltaMergeStore::preIngestFile(const String & parent_path, const PageIdU64 file_id, size_t file_size)
{
if (shutdown_called.load(std::memory_order_relaxed))
return;
auto delegator = path_pool->getStableDiskDelegator();
if (auto remote_data_store = global_context.getSharedContextDisagg()->remote_data_store; !remote_data_store)
{
delegator.addDTFile(file_id, file_size, parent_path);
}
else
{
delegator.addRemoteDTFileWithGCDisabled(file_id, file_size);
}
}
void DeltaMergeStore::removePreIngestFile(PageIdU64 file_id, bool throw_on_not_exist)
{
if (shutdown_called.load(std::memory_order_relaxed))
return;
auto delegator = path_pool->getStableDiskDelegator();
if (auto remote_data_store = global_context.getSharedContextDisagg()->remote_data_store; !remote_data_store)
{
delegator.removeDTFile(file_id, throw_on_not_exist);
}
else
{
delegator.removeRemoteDTFile(file_id, throw_on_not_exist);
}
}
void DeltaMergeStore::cleanPreIngestFiles(
const Context & db_context,
const DB::Settings & db_settings,
const std::vector<DM::ExternalDTFileInfo> & external_files)
{
auto dm_context = newDMContext(db_context, db_settings);
auto delegate = dm_context->path_pool->getStableDiskDelegator();
auto file_provider = dm_context->db_context.getFileProvider();
for (const auto & f : external_files)
{
auto file_parent_path = delegate.getDTFilePath(f.id);
auto file = DM::DMFile::restore(
file_provider,
f.id,
f.id,
file_parent_path,
DM::DMFile::ReadMetaMode::memoryAndDiskSize());
removePreIngestFile(f.id, false);
file->remove(file_provider);
}
}
Segments DeltaMergeStore::ingestDTFilesUsingColumnFile(
const DMContextPtr & dm_context,
const RowKeyRange & range,
const std::vector<DMFilePtr> & files,
bool clear_data_in_range)
{
auto delegate = dm_context->path_pool->getStableDiskDelegator();
auto file_provider = dm_context->db_context.getFileProvider();
Segments updated_segments;
RowKeyRange cur_range = range;
while (!cur_range.none())
{
RowKeyRange segment_range;
// Keep trying until succeeded.
while (true)
{
auto [segment, is_empty]
= getSegmentByStartKey(cur_range.getStart(), /*create_if_empty*/ true, /*throw_if_notfound*/ true);
FAIL_POINT_PAUSE(FailPoints::pause_when_ingesting_to_dt_store);
waitForWrite(dm_context, segment);
if (segment->hasAbandoned())
continue;
segment_range = segment->getRowKeyRange();
// Write could fail, because we do not lock the segment here.
// Thus, other threads may update the instance at any time, like split, merge, merge delta,
// causing the segment to be abandoned.
WriteBatches wbs(*storage_pool, dm_context->getWriteLimiter());
DMFiles data_files;
data_files.reserve(files.size());
for (const auto & file : files)
{
/// Generate DMFile instance with a new ref_id pointed to the file_id.
auto file_id = file->fileId();
const auto & file_parent_path = file->parentPath();
auto page_id = storage_pool->newDataPageIdForDTFile(delegate, __PRETTY_FUNCTION__);
auto ref_file
= DMFile::restore(file_provider, file_id, page_id, file_parent_path, DMFile::ReadMetaMode::all());
data_files.emplace_back(std::move(ref_file));
wbs.data.putRefPage(page_id, file->pageId());
}
// We have to commit those file_ids to PageStorage before applying the ingest, because after the write
// they are visible for readers immediately, who require file_ids to be found in PageStorage.
wbs.writeLogAndData();
bool ingest_success
= segment->ingestDataToDelta(*dm_context, range.shrink(segment_range), data_files, clear_data_in_range);
fiu_do_on(FailPoints::force_set_segment_ingest_packs_fail, { ingest_success = false; });
if (ingest_success)
{
updated_segments.push_back(segment);
fiu_do_on(FailPoints::segment_merge_after_ingest_packs, {
segment->flushCache(*dm_context);
segmentMergeDelta(*dm_context, segment, MergeDeltaReason::ForegroundWrite);
storage_pool->gc(global_context.getSettingsRef(), StoragePool::Seconds(0));
});
break;
}
else
{
wbs.rollbackWrittenLogAndData();
}
}
cur_range.setStart(segment_range.end);
cur_range.setEnd(range.end);
}
return updated_segments;
}
/**
* Accept a target ingest range and a vector of DTFiles, ingest these DTFiles (clipped by the target ingest range)
* using logical split.
*
* You must ensure DTFiles do not overlap. Otherwise this function will not work properly when clear_data_in_range == true.
* The check is performed in `ingestFiles`.
*
* WARNING: This function does not guarantee isolation. You may observe partial results when
* querying related segments when this function is running.
*/
Segments DeltaMergeStore::ingestDTFilesUsingSplit(
const DMContextPtr & dm_context,
const RowKeyRange & ingest_range,
const std::vector<ExternalDTFileInfo> & external_files,
const DMFiles & files,
bool clear_data_in_range)
{
{
RUNTIME_CHECK(files.size() == external_files.size(), files.size(), external_files.size());
for (size_t i = 0; i < files.size(); ++i)
RUNTIME_CHECK(files[i]->pageId() == external_files[i].id, files[i]->pageId(), external_files[i].toString());
}
std::set<SegmentPtr> updated_segments;
// First phase (DeleteRange Phase):
// Write DeleteRange to the covered segments to ensure that all data in the `ingest_range` is cleared.
if (clear_data_in_range)
{
RowKeyRange remaining_delete_range = ingest_range;
LOG_INFO(
log,
"Table ingest using split - delete range phase - begin, remaining_delete_range={}",
remaining_delete_range.toDebugString());
while (!remaining_delete_range.none())
{
auto [segment, is_empty] = getSegmentByStartKey(
remaining_delete_range.getStart(),
/*create_if_empty*/ true,
/*throw_if_notfound*/ true);
const auto delete_range = remaining_delete_range.shrink(segment->getRowKeyRange());
RUNTIME_CHECK(
!delete_range
.none(), // as remaining_delete_range is not none, we expect the shrinked range to be not none.
delete_range.toDebugString(),
segment->simpleInfo(),
remaining_delete_range.toDebugString());
LOG_DEBUG(
log,
"Table ingest using split - delete range phase - Try to delete range in segment, delete_range={} "
"segment={} remaining_delete_range={} updated_segments_n={}",
delete_range.toDebugString(),
segment->simpleInfo(),
remaining_delete_range.toDebugString(),
updated_segments.size());
const bool succeeded = segment->write(*dm_context, delete_range);
if (succeeded)
{
updated_segments.insert(segment);
RUNTIME_CHECK(compare(delete_range.getEnd(), remaining_delete_range.getStart()) >= 0);
remaining_delete_range.setStart(delete_range.end); // We always move forward
}
else
{
// segment may be abandoned, retry current range by finding the segment again.
}
}
LOG_DEBUG(
log,
"Table ingest using split - delete range phase - finished, updated_segments_n={}",
updated_segments.size());
}
/*
* In second phase (SplitIngest Phase),
* we will try to ingest DMFile one by one into the segments.
*
* Consider the following case:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│- DMFile --│---- DMFile ----│- DMFile --│ │
* │- Segment --│-- Seg --│------- Segment -----│- Seg -│------- Segment --------│
*
* This is what we will ingest:
* Iterate 0:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* ↑ ↑ The segment we ingest DMFile into
*
* Iterate 1:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │************│- DMFile --│ │
* │ │------- Segment -----│ │
* ↑ The segment we ingest DMFile into
*/
LOG_DEBUG(
log,
"Table ingest using split - split ingest phase - begin, ingest_range={}, files_n={}",
ingest_range.toDebugString(),
files.size());
for (size_t file_idx = 0; file_idx < files.size(); file_idx++)
{
// This should not happen. Just check to be confident.
// Even if it happened, we could handle it gracefully here. (but it really means somewhere else is broken)
if (files[file_idx]->getRows() == 0)
{
LOG_WARNING(
log,
"Table ingest using split - split ingest phase - Unexpected empty DMFile, skipped. ingest_range={} "
"file_idx={} file={}",
ingest_range.toDebugString(),
file_idx,
files[file_idx]->path());
continue;
}
/**
* Each DMFile (bounded by the ingest range) may overlap with multiple segments, like:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* We will try to ingest it into all overlapped segments.
*/
auto file_ingest_range = external_files[file_idx].range.shrink(ingest_range);
while (!file_ingest_range.none()) // This DMFile has remaining data to ingest
{
auto [segment, is_empty] = getSegmentByStartKey(
file_ingest_range.getStart(),
/*create_if_empty*/ true,
/*throw_if_notfound*/ true);
if (segment->hasAbandoned())
continue; // retry with current range and file
/**
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* ^^^^^^^^ segment_ingest_range
*/
const auto segment_ingest_range = file_ingest_range.shrink(segment->getRowKeyRange());
RUNTIME_CHECK(
!segment_ingest_range.none(),
segment_ingest_range.toDebugString(),
file_idx,
files[file_idx]->path(),
segment->simpleInfo());
LOG_INFO(
log,
"Table ingest using split - split ingest phase - Try to ingest file into segment, file_idx={} "
"file_id=dmf_{} file_ingest_range={} segment={} segment_ingest_range={}",
file_idx,
files[file_idx]->fileId(),
file_ingest_range.toDebugString(),
segment->simpleInfo(),
segment_ingest_range.toDebugString());
const bool succeeded = ingestDTFileIntoSegmentUsingSplit(
*dm_context,
segment,
segment_ingest_range,
files[file_idx],
clear_data_in_range);
if (succeeded)
{
updated_segments.insert(segment);
// We have ingested (DTFileRange ∪ ThisSegmentRange), let's try with next overlapped segment.
RUNTIME_CHECK(compare(segment_ingest_range.getEnd(), file_ingest_range.getStart()) > 0);
file_ingest_range.setStart(segment_ingest_range.end);
}
else
{
// this segment is abandoned, or may be split into multiples.
// retry with current range and file and find segment again.
}
}
}
LOG_DEBUG(
log,
"Table ingest using split - split ingest phase - finished, updated_segments_n={}",
updated_segments.size());
return std::vector<SegmentPtr>(updated_segments.begin(), updated_segments.end());
}
/**
* Ingest one DTFile into the target segment by using logical split.
*/
bool DeltaMergeStore::ingestDTFileIntoSegmentUsingSplit(
DMContext & dm_context,
const SegmentPtr & segment,
const RowKeyRange & ingest_range,
const DMFilePtr & file,
bool clear_data_in_range)
{
const auto & segment_range = segment->getRowKeyRange();
// The ingest_range must fall in segment's range.
RUNTIME_CHECK(!ingest_range.none(), ingest_range.toDebugString());
RUNTIME_CHECK(
compare(segment_range.getStart(), ingest_range.getStart()) <= 0,
segment_range.toDebugString(),
ingest_range.toDebugString());
RUNTIME_CHECK(
compare(segment_range.getEnd(), ingest_range.getEnd()) >= 0,
segment_range.toDebugString(),
ingest_range.toDebugString());
const bool is_start_matching = (compare(segment_range.getStart(), ingest_range.getStart()) == 0);
const bool is_end_matching = (compare(segment_range.getEnd(), ingest_range.getEnd()) == 0);
if (is_start_matching && is_end_matching)
{
/*
* The segment and the ingest range is perfectly matched.
*
* Example:
* │----------- Segment ----------│
* │-------- Ingest Range --------│
*/
auto delegate = dm_context.path_pool->getStableDiskDelegator();
auto file_provider = dm_context.db_context.getFileProvider();
WriteBatches wbs(*storage_pool, dm_context.getWriteLimiter());
// Generate DMFile instance with a new ref_id pointed to the file_id,
// because we may use the same DMFile to ingest into multiple segments.
auto new_page_id = storage_pool->newDataPageIdForDTFile(delegate, __PRETTY_FUNCTION__);
auto ref_file = DMFile::restore(
file_provider,
file->fileId(),
new_page_id,
file->parentPath(),
DMFile::ReadMetaMode::all());
wbs.data.putRefPage(new_page_id, file->pageId());
// We have to commit those file_ids to PageStorage before applying the ingest, because after the write
// they are visible for readers immediately, who require file_ids to be found in PageStorage.
wbs.writeLogAndData();
// clear_all_data_in_segment == clear_data_in_range is safe, because we have verified
// that current segment range is identical to the ingest range.
auto new_segment = segmentIngestData(dm_context, segment, ref_file, clear_data_in_range);
if (new_segment == nullptr)
{
// When ingest failed, just discard this ref file.
wbs.rollbackWrittenLogAndData();
// likely caused by snapshot failed.
// Sleep awhile and retry.
std::this_thread::sleep_for(std::chrono::milliseconds(100));
return false;
}
return true;
}
else if (is_start_matching)
{
/*
* Example:
* │--------------- Segment ---------------│
* │-------- Ingest Range --------│
*
* We will logical split the segment to form a perfect matching segment:
* │--------------- Segment ------│--------│
* │-------- Ingest Range --------│
*/
const auto [left, right] = segmentSplit(
dm_context,
segment,
SegmentSplitReason::ForIngest,
ingest_range.end,
SegmentSplitMode::Logical);
if (left == nullptr || right == nullptr)
{
// Split failed, likely caused by snapshot failed.
// Sleep awhile and retry.
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
// Always returning false, because we need to retry to get a new segment (as the old segment is abandoned)
// even when split succeeded.
return false;
}
else if (is_end_matching)
{
/*
* Example:
* │--------------- Segment ---------------│
* │-------- Ingest Range --------│
*
* We will logical split the segment to form a perfect matching segment:
* │--------│------ Segment ---------------│
* │-------- Ingest Range --------│
*/
const auto [left, right] = segmentSplit(
dm_context,
segment,
SegmentSplitReason::ForIngest,
ingest_range.start,
SegmentSplitMode::Logical);
if (left == nullptr || right == nullptr)
{
// Split failed, likely caused by snapshot failed.
// Sleep awhile and retry.
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
return false;
}
else
{
/*
* Example:
* │--------------- Segment ---------------│
* │-------- Ingest Range --------│
*
* We invoke a logical split first:
* │---│----------- Segment ---------------│
* │-------- Ingest Range --------│
*/
const auto [left, right] = segmentSplit(
dm_context,
segment,
SegmentSplitReason::ForIngest,
ingest_range.start,
SegmentSplitMode::Logical);
if (left == nullptr || right == nullptr)
{
// Split failed, likely caused by snapshot failed.
// Sleep awhile and retry.
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
return false;
}
}
UInt64 DeltaMergeStore::ingestFiles(
const DMContextPtr & dm_context,
const RowKeyRange & range,
const std::vector<DM::ExternalDTFileInfo> & external_files,
bool clear_data_in_range)
{
if (unlikely(shutdown_called.load(std::memory_order_relaxed)))
{
const auto msg = fmt::format("Try to ingest files into a shutdown table, store={}", log->identifier());
LOG_WARNING(log, "{}", msg);
throw Exception(msg);
}
{
// `ingestDTFilesUsingSplit` requires external_files to be not overlapped. Otherwise the results will be incorrect.
// Here we verify the external_files are ordered and not overlapped.
// "Ordered" is actually not a hard requirement by `ingestDTFilesUsingSplit`. However "ordered" makes us easy to check overlap efficiently.
RowKeyValue last_end;
if (is_common_handle)
last_end = RowKeyValue::COMMON_HANDLE_MIN_KEY;
else
last_end = RowKeyValue::INT_HANDLE_MIN_KEY;
// Suppose we have keys: 1, 2, | 3, 4, 5, | 6, | 7, 8
// Our file ranges will be: [1, 3), [3, 6), [6, 7), [7, 9)
// ↑ ↑
// A B
// We require A <= B.
for (const auto & ext_file : external_files)
{
RUNTIME_CHECK(!ext_file.range.none(), ext_file.toString());
RUNTIME_CHECK(
compare(last_end.toRowKeyValueRef(), ext_file.range.getStart()) <= 0,
last_end.toDebugString(),
ext_file.toString());
last_end = ext_file.range.end;
}
// Check whether all external files are contained by the range.
if (dm_context->db_context.getSettingsRef().dt_enable_ingest_check)
{
for (const auto & ext_file : external_files)
{
RUNTIME_CHECK_MSG(
compare(range.getStart(), ext_file.range.getStart()) <= 0
&& compare(range.getEnd(), ext_file.range.getEnd()) >= 0,
"Detected illegal region boundary: range={} file_range={} keyspace={} table_id={}. "
"TiFlash will exit to prevent data inconsistency. "
"If you accept data inconsistency and want to continue the service, "
"set profiles.default.dt_enable_ingest_check=false .",
keyspace_id,
physical_table_id,
range.toDebugString(),
ext_file.range.toDebugString());
}
}
}
EventRecorder write_block_recorder(ProfileEvents::DMWriteFile, ProfileEvents::DMWriteFileNS);
auto delegate = dm_context->path_pool->getStableDiskDelegator();
auto file_provider = dm_context->db_context.getFileProvider();
size_t rows = 0;
size_t bytes = 0;
size_t bytes_on_disk = 0;
auto remote_data_store = dm_context->db_context.getSharedContextDisagg()->remote_data_store;
StoreID store_id = InvalidStoreID;
if (remote_data_store)
{
store_id = dm_context->db_context.getTMTContext().getKVStore()->getStoreID();
}
DMFiles files;
for (const auto & external_file : external_files)
{
// we always create a ref file to this DMFile with all meta info restored later, so here we just restore meta info to calculate its' memory and disk size
DMFilePtr file;
if (!remote_data_store)
{
auto file_parent_path = delegate.getDTFilePath(external_file.id);
file = DMFile::restore(
file_provider,
external_file.id,
external_file.id,
file_parent_path,
DMFile::ReadMetaMode::memoryAndDiskSize());
}
else
{
Remote::DMFileOID oid{
.store_id = store_id,
.keyspace_id = dm_context->keyspace_id,
.table_id = dm_context->physical_table_id,
.file_id = external_file.id};
file = remote_data_store->prepareDMFile(oid, external_file.id)
->restore(DMFile::ReadMetaMode::memoryAndDiskSize());
}
rows += file->getRows();
bytes += file->getBytes();
bytes_on_disk += file->getBytesOnDisk();
// Do some simple verification for the file range.
if (file->getRows() > 0)
RUNTIME_CHECK(!external_file.range.none());
files.emplace_back(std::move(file));
}
bool use_split_replace = false;
if (bytes >= dm_context->delta_small_column_file_bytes)
{
// We still write small ssts directly into the delta layer.
use_split_replace = true;
}
fiu_do_on(FailPoints::force_ingest_via_delta, { use_split_replace = false; });
fiu_do_on(FailPoints::force_ingest_via_replace, { use_split_replace = true; });
{
auto get_ingest_files = [&] {
FmtBuffer fmt_buf;
fmt_buf.append("[");
fmt_buf.joinStr(
external_files.begin(),
external_files.end(),
[](const ExternalDTFileInfo & external_file, FmtBuffer & fb) { fb.append(external_file.toString()); },
",");
fmt_buf.append("]");
return fmt_buf.toString();
};
LOG_INFO(
log,
"Table ingest files - begin, use_split_replace={} files={} rows={} bytes={} bytes_on_disk={} range={} "
"clear={}",
use_split_replace,
get_ingest_files(),
rows,
bytes,
bytes_on_disk,
range.toDebugString(),
clear_data_in_range);
}
// Put the ingest file ids into `storage_pool` and use ref id in each segments to ensure the atomic
// of ingesting.
// Check https://github.com/pingcap/tics/issues/2040 for more details.
// TODO: If tiflash crash during the middle of ingesting, we may leave some DTFiles on disk and
// they can not be deleted. We should find a way to cleanup those files.
WriteBatches ingest_wbs(*storage_pool, dm_context->getWriteLimiter());
if (!files.empty())
{
for (const auto & file : files)
{
if (!remote_data_store)
{
ingest_wbs.data.putExternal(file->fileId(), 0);
}
else
{
Remote::DMFileOID oid{
.store_id = store_id,
.keyspace_id = dm_context->keyspace_id,
.table_id = dm_context->physical_table_id,
.file_id = file->fileId()};
PS::V3::CheckpointLocation loc{
.data_file_id = std::make_shared<String>(S3::S3Filename::fromDMFileOID(oid).toFullKey()),
.offset_in_file = 0,
.size_in_file = 0,
};
ingest_wbs.data.putRemoteExternal(file->fileId(), loc);
}
}
ingest_wbs.writeLogAndData();
ingest_wbs.setRollback(); // rollback if exception thrown
}
Segments updated_segments;
if (!range.none())
{
if (use_split_replace)
updated_segments = ingestDTFilesUsingSplit(dm_context, range, external_files, files, clear_data_in_range);
else
updated_segments = ingestDTFilesUsingColumnFile(dm_context, range, files, clear_data_in_range);
}
// Enable gc for DTFile after all segment applied.
// Note that we can not enable gc for them once they have applied to any segments.
// Assume that one segment get compacted after file ingested, `gc_handle` gc the
// DTFiles before they get applied to all segments. Then we will apply some
// deleted DTFiles to other segments.
if (auto data_store = dm_context->db_context.getSharedContextDisagg()->remote_data_store; !data_store)
{
for (auto & file : files)
file->enableGC();
}
else
{
auto delegator = dm_context->path_pool->getStableDiskDelegator();
for (auto & file : files)
delegator.enableGCForRemoteDTFile(file->fileId());
}
// After the ingest DTFiles applied, remove the original page
ingest_wbs.rollbackWrittenLogAndData();
{
// Add some logging about the ingested file ids and updated segments
// Example: "ingested_files=[<file=dmf_1001 range=..>,<file=dmf_1002 range=..>] updated_segments=[<segment_id=1 ...>,<segment_id=3 ...>]"
// "ingested_files=[] updated_segments=[<segment_id=1 ...>,<segment_id=3 ...>]"
auto get_ingest_info = [&] {
FmtBuffer fmt_buf;
fmt_buf.append("ingested_files=[");
fmt_buf.joinStr(
external_files.begin(),
external_files.end(),
[](const ExternalDTFileInfo & external_file, FmtBuffer & fb) { fb.append(external_file.toString()); },
",");
fmt_buf.append("] updated_segments=[");
fmt_buf.joinStr(
updated_segments.begin(),
updated_segments.end(),
[](const auto & segment, FmtBuffer & fb) { fb.append(segment->simpleInfo()); },
",");
fmt_buf.append("]");
return fmt_buf.toString();
};
LOG_INFO(
log,
"Table ingest files - finished ingested files into segments, {} clear={}",
get_ingest_info(),
clear_data_in_range);
}
GET_METRIC(tiflash_storage_throughput_bytes, type_ingest).Increment(bytes);
GET_METRIC(tiflash_storage_throughput_rows, type_ingest).Increment(rows);
if (!range.none())
flushCache(dm_context, range);
// TODO: Update the tracing_id before checkSegmentUpdate?
for (auto & segment : updated_segments)
checkSegmentUpdate(dm_context, segment, ThreadType::Write, InputType::RaftSSTAndSnap);
return bytes;
}
std::vector<SegmentPtr> DeltaMergeStore::ingestSegmentsUsingSplit(
const DMContextPtr & dm_context,
const RowKeyRange & ingest_range,
const std::vector<SegmentPtr> & target_segments)
{
std::set<SegmentPtr> updated_segments;
// First phase (DeleteRange Phase):
// Write DeleteRange to the covered segments to ensure that all data in the `ingest_range` is cleared.
{
RowKeyRange remaining_delete_range = ingest_range;
LOG_INFO(
log,
"Table ingest checkpoint using split - delete range phase - begin, remaining_delete_range={}",
remaining_delete_range.toDebugString());
while (!remaining_delete_range.none())
{
auto [segment, is_empty] = getSegmentByStartKey(
remaining_delete_range.getStart(),
/*create_if_empty*/ true,
/*throw_if_notfound*/ true);
const auto delete_range = remaining_delete_range.shrink(segment->getRowKeyRange());
RUNTIME_CHECK(
!delete_range
.none(), // as remaining_delete_range is not none, we expect the shrinked range to be not none.
delete_range.toDebugString(),
segment->simpleInfo(),
remaining_delete_range.toDebugString());
LOG_DEBUG(
log,
"Table ingest checkpoint using split - delete range phase - Try to delete range in segment, "
"delete_range={} segment={} remaining_delete_range={} updated_segments_n={}",
delete_range.toDebugString(),
segment->simpleInfo(),
remaining_delete_range.toDebugString(),
updated_segments.size());
const bool succeeded = segment->write(*dm_context, delete_range);
if (succeeded)
{
updated_segments.insert(segment);
RUNTIME_CHECK(compare(delete_range.getEnd(), remaining_delete_range.getStart()) >= 0);
remaining_delete_range.setStart(delete_range.end); // We always move forward
}
else
{
// segment may be abandoned, retry current range by finding the segment again.
}
}
}
LOG_DEBUG(
log,
"Table ingest checkpoint using split - delete range phase - finished, updated_segments_n={}",
updated_segments.size());
/*
* In second phase (SplitIngest Phase),
* we will try to ingest DMFile one by one into the segments in order.
*
* Consider the following case:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│- DMFile --│---- DMFile ----│- DMFile --│ │
* │- Segment --│-- Seg --│------- Segment -----│- Seg -│------- Segment --------│
*
* This is what we will ingest:
* Iterate 0:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* ↑ ↑ The segment we ingest DMFile into
*
* Iterate 1:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │************│- DMFile --│ │
* │ │------- Segment -----│ │
* ↑ The segment we ingest DMFile into
*/
LOG_DEBUG(
log,
"Table ingest checkpoint using split - split ingest phase - begin, ingest_range={}, files_n={}",
ingest_range.toDebugString(),
target_segments.size());
for (size_t segment_idx = 0; segment_idx < target_segments.size(); segment_idx++)
{
// We may meet empty segment, just ignore it
if (target_segments[segment_idx]->getEstimatedRows() == 0)
{
LOG_INFO(
log,
"Table ingest checkpoint using split - split ingest phase - Meet empty Segment, skipped. "
"ingest_range={} segment_idx={}",
ingest_range.toDebugString(),
segment_idx);
continue;
}
/**
* Each DMFile (bounded by the ingest range) may overlap with multiple segments, like:
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* We will try to ingest it into all overlapped segments.
*/
auto file_ingest_range = target_segments[segment_idx]->getRowKeyRange();
while (!file_ingest_range.none()) // This DMFile has remaining data to ingest
{
auto [segment, is_empty] = getSegmentByStartKey(
file_ingest_range.getStart(),
/*create_if_empty*/ true,
/*throw_if_notfound*/ true);
if (segment->hasAbandoned())
continue; // retry with current range and file
/**
* -Inf +Inf
* │ │--------------- Ingest Range ---------------│ │
* │ │-- DMFile --│ │
* │ │-- Seg --│------- Segment -----│ │
* ^^^^^^^^ segment_ingest_range
*/
const auto segment_ingest_range = file_ingest_range.shrink(segment->getRowKeyRange());
RUNTIME_CHECK(!segment_ingest_range.none());
LOG_INFO(
log,
"Table ingest checkpoint using split - split ingest phase - Try to ingest file into segment, "
"segment_idx={} segment_id={} segment_ingest_range={} segment={} segment_ingest_range={}",
segment_idx,
target_segments[segment_idx]->segmentId(),
file_ingest_range.toDebugString(),
segment->simpleInfo(),
segment_ingest_range.toDebugString());
const bool succeeded = ingestSegmentDataIntoSegmentUsingSplit(
*dm_context,
segment,
segment_ingest_range,
target_segments[segment_idx]);
if (succeeded)
{
updated_segments.insert(segment);
// We have ingested (DTFileRange ∪ ThisSegmentRange), let's try with next overlapped segment.
RUNTIME_CHECK(compare(segment_ingest_range.getEnd(), file_ingest_range.getStart()) > 0);
file_ingest_range.setStart(segment_ingest_range.end);
}
else
{
// this segment is abandoned, or may be split into multiples.
// retry with current range and file and find segment again.
}
}
}
LOG_DEBUG(
log,
"Table ingest checkpoint using split - split ingest phase - finished, updated_segments_n={}",
updated_segments.size());
return std::vector<SegmentPtr>(updated_segments.begin(), updated_segments.end());
}
bool DeltaMergeStore::ingestSegmentDataIntoSegmentUsingSplit(
DMContext & dm_context,
const SegmentPtr & segment,
const RowKeyRange & ingest_range,
const SegmentPtr & segment_to_ingest)
{
const auto & segment_range = segment->getRowKeyRange();
// The ingest_range must fall in segment's range.
RUNTIME_CHECK(!ingest_range.none(), ingest_range.toDebugString());
RUNTIME_CHECK(
compare(segment_range.getStart(), ingest_range.getStart()) <= 0,
segment_range.toDebugString(),
ingest_range.toDebugString());
RUNTIME_CHECK(
compare(segment_range.getEnd(), ingest_range.getEnd()) >= 0,
segment_range.toDebugString(),
ingest_range.toDebugString());
const bool is_start_matching = (compare(segment_range.getStart(), ingest_range.getStart()) == 0);
const bool is_end_matching = (compare(segment_range.getEnd(), ingest_range.getEnd()) == 0);
if (is_start_matching && is_end_matching)
{
/*