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RegionTable.cpp
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RegionTable.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/setThreadName.h>
#include <Storages/DeltaMerge/ExternalDTFileInfo.h>
#include <Storages/IManageableStorage.h>
#include <Storages/StorageDeltaMerge.h>
#include <Storages/StorageDeltaMergeHelpers.h>
#include <Storages/Transaction/KVStore.h>
#include <Storages/Transaction/Region.h>
#include <Storages/Transaction/RegionManager.h>
#include <Storages/Transaction/RegionTable.h>
#include <Storages/Transaction/TMTContext.h>
#include <Storages/Transaction/TiKVRange.h>
#include <TiDB/Schema/SchemaSyncer.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int UNKNOWN_TABLE;
extern const int ILLFORMAT_RAFT_ROW;
extern const int TABLE_IS_DROPPED;
} // namespace ErrorCodes
RegionTable::Table & RegionTable::getOrCreateTable(const TableID table_id)
{
auto it = tables.find(table_id);
if (it == tables.end())
{
// Load persisted info.
it = tables.emplace(table_id, table_id).first;
LOG_INFO(log, "get new table {}", table_id);
}
return it->second;
}
RegionTable::InternalRegion & RegionTable::insertRegion(Table & table, const Region & region)
{
const auto range = region.getRange();
return insertRegion(table, *range, region.id());
}
RegionTable::InternalRegion & RegionTable::insertRegion(Table & table, const RegionRangeKeys & region_range_keys, const RegionID region_id)
{
auto & table_regions = table.regions;
// Insert table mapping.
// todo check if region_range_keys.mapped_table_id == table.table_id ??
auto [it, ok] = table_regions.emplace(region_id, InternalRegion(region_id, region_range_keys.rawKeys()));
if (!ok)
throw Exception(
std::string(__PRETTY_FUNCTION__) + ": insert duplicate internal region " + DB::toString(region_id),
ErrorCodes::LOGICAL_ERROR);
// Insert region mapping.
regions[region_id] = table.table_id;
return it->second;
}
RegionTable::InternalRegion & RegionTable::doGetInternalRegion(DB::TableID table_id, DB::RegionID region_id)
{
return tables.find(table_id)->second.regions.find(region_id)->second;
}
RegionTable::InternalRegion & RegionTable::getOrInsertRegion(const Region & region)
{
auto table_id = region.getMappedTableID();
auto & table = getOrCreateTable(table_id);
auto & table_regions = table.regions;
if (auto it = table_regions.find(region.id()); it != table_regions.end())
return it->second;
return insertRegion(table, region);
}
void RegionTable::shrinkRegionRange(const Region & region)
{
std::lock_guard lock(mutex);
auto & internal_region = getOrInsertRegion(region);
internal_region.range_in_table = region.getRange()->rawKeys();
internal_region.cache_bytes = region.dataSize();
if (internal_region.cache_bytes)
dirty_regions.insert(internal_region.region_id);
}
bool RegionTable::shouldFlush(const InternalRegion & region) const
{
if (region.pause_flush)
return false;
if (!region.cache_bytes)
return false;
auto period_time = Clock::now() - region.last_flush_time;
for (const auto & [th_bytes, th_duration] : *flush_thresholds.getData())
{
if (region.cache_bytes >= th_bytes && period_time >= th_duration)
{
LOG_INFO(log, "region {}, cache size {}, seconds since last {}", region.region_id, region.cache_bytes, std::chrono::duration_cast<std::chrono::seconds>(period_time).count());
return true;
}
}
return false;
}
RegionDataReadInfoList RegionTable::flushRegion(const RegionPtrWithBlock & region, bool try_persist) const
{
auto & tmt = context->getTMTContext();
LOG_TRACE(log, "table {}, {} original {} bytes", region->getMappedTableID(), region->toString(false), region->dataSize());
/// Write region data into corresponding storage.
RegionDataReadInfoList data_list_to_remove;
{
writeBlockByRegion(*context, region, data_list_to_remove, log);
}
{
size_t cache_size = region->dataSize();
if (cache_size == 0)
{
if (try_persist)
{
KVStore::tryFlushRegionCacheInStorage(tmt, *region, log);
tmt.getKVStore()->tryPersist(region->id());
}
}
LOG_TRACE(log, "table {}, {} after flush {} bytes", region->getMappedTableID(), region->toString(false), cache_size);
}
return data_list_to_remove;
}
static const Int64 FTH_BYTES_1 = 1; // 1 B
static const Int64 FTH_BYTES_2 = 1024 * 1024; // 1 MB
static const Int64 FTH_BYTES_3 = 1024 * 1024 * 10; // 10 MBs
static const Int64 FTH_BYTES_4 = 1024 * 1024 * 50; // 50 MBs
static const Seconds FTH_PERIOD_1(60 * 60); // 1 hour
static const Seconds FTH_PERIOD_2(60 * 5); // 5 minutes
static const Seconds FTH_PERIOD_3(60); // 1 minute
static const Seconds FTH_PERIOD_4(5); // 5 seconds
RegionTable::RegionTable(Context & context_)
: flush_thresholds(RegionTable::FlushThresholds::FlushThresholdsData{
{FTH_BYTES_1, FTH_PERIOD_1},
{FTH_BYTES_2, FTH_PERIOD_2},
{FTH_BYTES_3, FTH_PERIOD_3},
{FTH_BYTES_4, FTH_PERIOD_4}})
, context(&context_)
, log(Logger::get())
{}
void RegionTable::restore()
{
LOG_INFO(log, "Start to restore");
const auto & tmt = context->getTMTContext();
tmt.getKVStore()->traverseRegions([this](const RegionID, const RegionPtr & region) { updateRegion(*region); });
LOG_INFO(log, "Restore {} tables", tables.size());
}
void RegionTable::removeTable(TableID table_id)
{
std::lock_guard lock(mutex);
auto it = tables.find(table_id);
if (it == tables.end())
return;
auto & table = it->second;
// Remove from region list.
for (const auto & region_info : table.regions)
{
regions.erase(region_info.first);
{
std::unique_lock write_lock(rw_lock);
safe_ts_map.erase(region_info.first);
}
}
// Remove from table map.
tables.erase(it);
LOG_INFO(log, "remove table {} in RegionTable success", table_id);
}
void RegionTable::updateRegion(const Region & region)
{
std::lock_guard lock(mutex);
auto & internal_region = getOrInsertRegion(region);
internal_region.cache_bytes = region.dataSize();
if (internal_region.cache_bytes)
dirty_regions.insert(internal_region.region_id);
}
namespace
{
/// Remove obsolete data for table after data of `handle_range` is removed from this TiFlash node.
/// Note that this function will try to acquire lock by `IStorage->lockForShare`
void removeObsoleteDataInStorage(
Context * const context,
const TableID table_id,
const std::pair<DecodedTiKVKeyPtr, DecodedTiKVKeyPtr> & handle_range)
{
TMTContext & tmt = context->getTMTContext();
auto storage = tmt.getStorages().get(table_id);
// For DT only now
if (!storage || storage->engineType() != TiDB::StorageEngine::DT)
return;
try
{
// Acquire a `drop_lock` so that no other threads can drop the `storage`
auto storage_lock = storage->lockForShare(getThreadNameAndID());
auto dm_storage = std::dynamic_pointer_cast<StorageDeltaMerge>(storage);
if (dm_storage == nullptr)
return;
/// Now we assume that these won't block for long time.
auto rowkey_range
= DM::RowKeyRange::fromRegionRange(handle_range, table_id, table_id, storage->isCommonHandle(), storage->getRowKeyColumnSize());
dm_storage->deleteRange(rowkey_range, context->getSettingsRef());
dm_storage->flushCache(*context, rowkey_range, /*try_until_succeed*/ true); // flush to disk
}
catch (DB::Exception & e)
{
// We can ignore if the storage is already dropped.
if (e.code() != ErrorCodes::TABLE_IS_DROPPED)
throw;
}
}
} // namespace
void RegionTable::removeRegion(const RegionID region_id, bool remove_data, const RegionTaskLock &)
{
TableID table_id = 0;
std::pair<DecodedTiKVKeyPtr, DecodedTiKVKeyPtr> handle_range;
{
/// We need to protect `regions` and `table` under mutex lock
std::lock_guard lock(mutex);
auto it = regions.find(region_id);
if (it == regions.end())
{
LOG_WARNING(log, "region {} does not exist.", region_id);
return;
}
table_id = it->second;
auto & table = tables.find(table_id)->second;
auto internal_region_it = table.regions.find(region_id);
handle_range = internal_region_it->second.range_in_table;
regions.erase(it);
{
std::unique_lock write_lock(rw_lock);
safe_ts_map.erase(region_id);
}
table.regions.erase(internal_region_it);
if (table.regions.empty())
{
tables.erase(table_id);
}
LOG_INFO(log, "remove [region {}] in RegionTable done", region_id);
}
// Sometime we don't need to remove data. e.g. remove region after region merge.
if (remove_data)
{
// Try to remove obsolete data in storage
// Note that we should do this without lock on RegionTable.
// But caller(KVStore) should ensure that no new data write into this handle_range
// before `removeObsoleteDataInStorage` is done. (by param `RegionTaskLock`)
// And this is expected not to block for long time.
removeObsoleteDataInStorage(context, table_id, handle_range);
LOG_INFO(log, "remove region [{}] in storage done", region_id);
}
}
RegionDataReadInfoList RegionTable::tryFlushRegion(RegionID region_id, bool try_persist)
{
auto region = context->getTMTContext().getKVStore()->getRegion(region_id);
if (!region)
{
LOG_WARNING(log, "region {} not found", region_id);
return {};
}
return tryFlushRegion(region, try_persist);
}
RegionDataReadInfoList RegionTable::tryFlushRegion(const RegionPtrWithBlock & region, bool try_persist)
{
RegionID region_id = region->id();
const auto func_update_region = [&](std::function<bool(InternalRegion &)> && callback) -> bool {
std::lock_guard lock(mutex);
if (auto it = regions.find(region_id); it != regions.end())
{
auto & internal_region = doGetInternalRegion(it->second, region_id);
return callback(internal_region);
}
else
{
LOG_WARNING(log, "Internal region {} might be removed", region_id);
return false;
}
};
bool status = func_update_region([&](InternalRegion & internal_region) -> bool {
if (internal_region.pause_flush)
{
LOG_INFO(log, "Internal region {} pause flush, may be being flushed", region_id);
return false;
}
internal_region.pause_flush = true;
return true;
});
if (!status)
return {};
std::exception_ptr first_exception;
RegionDataReadInfoList data_list_to_remove;
try
{
data_list_to_remove = flushRegion(region, try_persist);
}
catch (const Exception & e)
{
if (e.code() == ErrorCodes::ILLFORMAT_RAFT_ROW)
{
// br or lighting may write illegal data into tikv, skip flush.
LOG_WARNING(&Poco::Logger::get(__PRETTY_FUNCTION__), "Got error while reading region committed cache: {}. Skip flush region and keep original cache.", e.displayText());
}
else
first_exception = std::current_exception();
}
catch (...)
{
first_exception = std::current_exception();
}
func_update_region([&](InternalRegion & internal_region) -> bool {
internal_region.pause_flush = false;
internal_region.cache_bytes = region->dataSize();
if (internal_region.cache_bytes)
dirty_regions.insert(region_id);
else
dirty_regions.erase(region_id);
internal_region.last_flush_time = Clock::now();
return true;
});
if (first_exception)
std::rethrow_exception(first_exception);
return data_list_to_remove;
}
RegionID RegionTable::pickRegionToFlush()
{
std::lock_guard lock(mutex);
for (auto dirty_it = dirty_regions.begin(); dirty_it != dirty_regions.end();)
{
auto region_id = *dirty_it;
if (auto it = regions.find(region_id); it != regions.end())
{
auto table_id = it->second;
if (shouldFlush(doGetInternalRegion(table_id, region_id)))
{
// The dirty flag should only be removed after data is flush successfully.
return region_id;
}
dirty_it++;
}
else
{
// Region{region_id} is removed, remove its dirty flag
dirty_it = dirty_regions.erase(dirty_it);
}
}
return InvalidRegionID;
}
bool RegionTable::tryFlushRegions()
{
if (RegionID region_to_flush = pickRegionToFlush(); region_to_flush != InvalidRegionID)
{
tryFlushRegion(region_to_flush, true);
return true;
}
return false;
}
void RegionTable::handleInternalRegionsByTable(const TableID table_id, std::function<void(const InternalRegions &)> && callback) const
{
std::lock_guard lock(mutex);
if (auto it = tables.find(table_id); it != tables.end())
callback(it->second.regions);
}
std::vector<std::pair<RegionID, RegionPtr>> RegionTable::getRegionsByTable(const TableID table_id) const
{
auto & kvstore = context->getTMTContext().getKVStore();
std::vector<std::pair<RegionID, RegionPtr>> regions;
handleInternalRegionsByTable(table_id, [&](const InternalRegions & internal_regions) {
for (const auto & region_info : internal_regions)
{
auto region = kvstore->getRegion(region_info.first);
if (region)
regions.emplace_back(region_info.first, std::move(region));
}
});
return regions;
}
void RegionTable::setFlushThresholds(const FlushThresholds::FlushThresholdsData & flush_thresholds_)
{
flush_thresholds.setFlushThresholds(flush_thresholds_);
}
void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeKeys & region_range_keys)
{
std::lock_guard lock(mutex);
auto table_id = region_range_keys.getMappedTableID();
auto new_handle_range = region_range_keys.rawKeys();
if (auto it = regions.find(region_id); it != regions.end())
{
if (table_id != it->second)
throw Exception(std::string(__PRETTY_FUNCTION__) + ": table id " + std::to_string(table_id) + " not match previous one "
+ std::to_string(it->second) + " in regions " + std::to_string(region_id),
ErrorCodes::LOGICAL_ERROR);
InternalRegion & internal_region = doGetInternalRegion(table_id, region_id);
if (*(internal_region.range_in_table.first) <= *(new_handle_range.first)
&& *(internal_region.range_in_table.second) >= *(new_handle_range.second))
{
LOG_INFO(log, "table {}, internal region {} has larger range", table_id, region_id);
}
else
{
internal_region.range_in_table.first = *new_handle_range.first < *internal_region.range_in_table.first
? new_handle_range.first
: internal_region.range_in_table.first;
internal_region.range_in_table.second = *new_handle_range.second > *internal_region.range_in_table.second
? new_handle_range.second
: internal_region.range_in_table.second;
}
}
else
{
auto & table = getOrCreateTable(table_id);
insertRegion(table, region_range_keys, region_id);
LOG_INFO(log, "table {} insert internal region {}", table_id, region_id);
}
}
RegionPtrWithSnapshotFiles::RegionPtrWithSnapshotFiles(
const Base & base_,
std::vector<DM::ExternalDTFileInfo> && external_files_)
: base(base_)
, external_files(std::move(external_files_))
{}
bool RegionTable::isSafeTSLag(UInt64 region_id, UInt64 * leader_safe_ts, UInt64 * self_safe_ts)
{
{
std::shared_lock lock(rw_lock);
auto it = safe_ts_map.find(region_id);
if (it == safe_ts_map.end())
{
return false;
}
*leader_safe_ts = it->second->leader_safe_ts.load(std::memory_order_relaxed);
*self_safe_ts = it->second->self_safe_ts.load(std::memory_order_relaxed);
}
LOG_TRACE(log, "region_id:{}, table_id:{}, leader_safe_ts:{}, self_safe_ts:{}", region_id, regions[region_id], *leader_safe_ts, *self_safe_ts);
return (*leader_safe_ts > *self_safe_ts) && ((*leader_safe_ts >> TsoPhysicalShiftBits) - (*self_safe_ts >> TsoPhysicalShiftBits) > SafeTsDiffThreshold);
}
UInt64 RegionTable::getSelfSafeTS(UInt64 region_id)
{
std::shared_lock lock(rw_lock);
auto it = safe_ts_map.find(region_id);
if (it == safe_ts_map.end())
{
return 0;
}
return it->second->self_safe_ts.load(std::memory_order_relaxed);
}
void RegionTable::updateSafeTS(UInt64 region_id, UInt64 leader_safe_ts, UInt64 self_safe_ts)
{
{
std::shared_lock lock(rw_lock);
auto it = safe_ts_map.find(region_id);
if (it == safe_ts_map.end() && (leader_safe_ts == InvalidSafeTS || self_safe_ts == InvalidSafeTS))
{
LOG_TRACE(log, "safe_ts_map empty but safe ts invalid, region_id:{}, leader_safe_ts:{}, self_safe_ts:{}", region_id, leader_safe_ts, self_safe_ts);
return;
}
if (it != safe_ts_map.end())
{
if (leader_safe_ts != InvalidSafeTS)
{
it->second->leader_safe_ts.store(leader_safe_ts, std::memory_order_relaxed);
}
if (self_safe_ts != InvalidSafeTS)
{
it->second->self_safe_ts.store(self_safe_ts, std::memory_order_relaxed);
}
return;
}
}
std::unique_lock lock(rw_lock);
safe_ts_map.emplace(region_id, std::make_unique<SafeTsEntry>(leader_safe_ts, self_safe_ts));
}
} // namespace DB