Write min_log_number_to_keep to MANIFEST during atomic flush under 2 phase commit (#7570)
Summary: When 2 phase commit is enabled, if there are prepared data in a WAL, the WAL should be kept, the minimum log number for such a WAL is written to MANIFEST during flush. In atomic flush, such information is not written to MANIFEST. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7570 Test Plan: Added a new unit test `DBAtomicFlushTest.ManualFlushUnder2PC`, this test fails in atomic flush without this PR, after this PR, it succeeds. Reviewed By: riversand963 Differential Revision: D24394222 Pulled By: cheng-chang fbshipit-source-id: 60ce74b21b704804943be40c8de01b41269cf116
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@ -9,6 +9,7 @@
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### Bug Fixes
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* Fixed the logic of populating native data structure for `read_amp_bytes_per_bit` during OPTIONS file parsing on big-endian architecture. Without this fix, original code introduced in PR7659, when running on big-endian machine, can mistakenly store read_amp_bytes_per_bit (an uint32) in little endian format. Future access to `read_amp_bytes_per_bit` will give wrong values. Little endian architecture is not affected.
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* Fixed prefix extractor with timestamp issues.
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* Fixed a bug in atomic flush: in two-phase commit mode, the minimum WAL log number to keep is incorrect.
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### New Features
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* User defined timestamp feature supports `CompactRange` and `GetApproximateSizes`.
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@ -708,9 +708,7 @@ uint64_t ColumnFamilyData::OldestLogToKeep() {
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auto current_log = GetLogNumber();
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if (allow_2pc_) {
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autovector<MemTable*> empty_list;
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auto imm_prep_log =
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imm()->PrecomputeMinLogContainingPrepSection(empty_list);
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auto imm_prep_log = imm()->PrecomputeMinLogContainingPrepSection();
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auto mem_prep_log = mem()->GetMinLogContainingPrepSection();
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if (imm_prep_log > 0 && imm_prep_log < current_log) {
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@ -14,6 +14,7 @@
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#include "file/filename.h"
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#include "port/port.h"
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#include "port/stack_trace.h"
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#include "rocksdb/utilities/transaction_db.h"
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#include "test_util/sync_point.h"
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#include "util/cast_util.h"
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#include "util/mutexlock.h"
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@ -620,6 +621,96 @@ TEST_P(DBFlushTestBlobError, FlushError) {
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#endif // ROCKSDB_LITE
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}
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#ifndef ROCKSDB_LITE
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TEST_P(DBAtomicFlushTest, ManualFlushUnder2PC) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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options.allow_2pc = true;
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options.atomic_flush = GetParam();
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// 64MB so that memtable flush won't be trigger by the small writes.
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options.write_buffer_size = (static_cast<size_t>(64) << 20);
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// Destroy the DB to recreate as a TransactionDB.
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Close();
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Destroy(options, true);
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// Create a TransactionDB.
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TransactionDB* txn_db = nullptr;
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TransactionDBOptions txn_db_opts;
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txn_db_opts.write_policy = TxnDBWritePolicy::WRITE_COMMITTED;
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ASSERT_OK(TransactionDB::Open(options, txn_db_opts, dbname_, &txn_db));
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ASSERT_NE(txn_db, nullptr);
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db_ = txn_db;
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// Create two more columns other than default CF.
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std::vector<std::string> cfs = {"puppy", "kitty"};
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CreateColumnFamilies(cfs, options);
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ASSERT_EQ(handles_.size(), 2);
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ASSERT_EQ(handles_[0]->GetName(), cfs[0]);
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ASSERT_EQ(handles_[1]->GetName(), cfs[1]);
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const size_t kNumCfToFlush = options.atomic_flush ? 2 : 1;
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WriteOptions wopts;
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TransactionOptions txn_opts;
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// txn1 only prepare, but does not commit.
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// The WAL containing the prepared but uncommitted data must be kept.
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Transaction* txn1 = txn_db->BeginTransaction(wopts, txn_opts, nullptr);
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// txn2 not only prepare, but also commit.
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Transaction* txn2 = txn_db->BeginTransaction(wopts, txn_opts, nullptr);
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ASSERT_NE(txn1, nullptr);
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ASSERT_NE(txn2, nullptr);
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for (size_t i = 0; i < kNumCfToFlush; i++) {
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ASSERT_OK(txn1->Put(handles_[i], "k1", "v1"));
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ASSERT_OK(txn2->Put(handles_[i], "k2", "v2"));
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}
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// A txn must be named before prepare.
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ASSERT_OK(txn1->SetName("txn1"));
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ASSERT_OK(txn2->SetName("txn2"));
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// Prepare writes to WAL, but not to memtable. (WriteCommitted)
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ASSERT_OK(txn1->Prepare());
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ASSERT_OK(txn2->Prepare());
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// Commit writes to memtable.
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ASSERT_OK(txn2->Commit());
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delete txn1;
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delete txn2;
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// There are still data in memtable not flushed.
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// But since data is small enough to reside in the active memtable,
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// there are no immutable memtable.
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for (size_t i = 0; i < kNumCfToFlush; i++) {
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auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
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ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
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ASSERT_FALSE(cfh->cfd()->mem()->IsEmpty());
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}
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// Atomic flush memtables,
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// the min log with prepared data should be written to MANIFEST.
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std::vector<ColumnFamilyHandle*> cfs_to_flush(kNumCfToFlush);
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for (size_t i = 0; i < kNumCfToFlush; i++) {
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cfs_to_flush[i] = handles_[i];
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}
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ASSERT_OK(txn_db->Flush(FlushOptions(), cfs_to_flush));
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// There are no remaining data in memtable after flush.
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for (size_t i = 0; i < kNumCfToFlush; i++) {
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auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
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ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
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ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
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ASSERT_EQ(cfh->cfd()->GetFlushReason(), FlushReason::kManualFlush);
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}
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// The recovered min log number with prepared data should be non-zero.
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// In 2pc mode, MinLogNumberToKeep returns the
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// VersionSet::min_log_number_to_keep_2pc recovered from MANIFEST, if it's 0,
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// it means atomic flush didn't write the min_log_number_to_keep to MANIFEST.
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cfs.push_back(kDefaultColumnFamilyName);
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ASSERT_OK(TryReopenWithColumnFamilies(cfs, options));
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DBImpl* db_impl = reinterpret_cast<DBImpl*>(db_);
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ASSERT_TRUE(db_impl->allow_2pc());
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ASSERT_NE(db_impl->MinLogNumberToKeep(), 0);
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}
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#endif // ROCKSDB_LITE
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TEST_P(DBAtomicFlushTest, ManualAtomicFlush) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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@ -634,13 +725,22 @@ TEST_P(DBAtomicFlushTest, ManualAtomicFlush) {
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for (size_t i = 0; i != num_cfs; ++i) {
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ASSERT_OK(Put(static_cast<int>(i) /*cf*/, "key", "value", wopts));
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}
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for (size_t i = 0; i != num_cfs; ++i) {
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auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
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ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
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ASSERT_FALSE(cfh->cfd()->mem()->IsEmpty());
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}
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std::vector<int> cf_ids;
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for (size_t i = 0; i != num_cfs; ++i) {
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cf_ids.emplace_back(static_cast<int>(i));
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}
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ASSERT_OK(Flush(cf_ids));
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for (size_t i = 0; i != num_cfs; ++i) {
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auto cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[i]);
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ASSERT_EQ(cfh->cfd()->GetFlushReason(), FlushReason::kManualFlush);
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ASSERT_EQ(0, cfh->cfd()->imm()->NumNotFlushed());
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ASSERT_TRUE(cfh->cfd()->mem()->IsEmpty());
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}
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@ -2234,6 +2234,12 @@ extern uint64_t PrecomputeMinLogNumberToKeep2PC(
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const autovector<VersionEdit*>& edit_list,
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const autovector<MemTable*>& memtables_to_flush,
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LogsWithPrepTracker* prep_tracker);
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// For atomic flush.
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extern uint64_t PrecomputeMinLogNumberToKeep2PC(
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VersionSet* vset, const autovector<ColumnFamilyData*>& cfds_to_flush,
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const autovector<autovector<VersionEdit*>>& edit_lists,
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const autovector<const autovector<MemTable*>*>& memtables_to_flush,
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LogsWithPrepTracker* prep_tracker);
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// In non-2PC mode, WALs with log number < the returned number can be
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// deleted after the cfd_to_flush column family is flushed successfully.
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@ -2251,6 +2257,10 @@ extern uint64_t PrecomputeMinLogNumberToKeepNon2PC(
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extern uint64_t FindMinPrepLogReferencedByMemTable(
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VersionSet* vset, const ColumnFamilyData* cfd_to_flush,
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const autovector<MemTable*>& memtables_to_flush);
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// For atomic flush.
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extern uint64_t FindMinPrepLogReferencedByMemTable(
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VersionSet* vset, const autovector<ColumnFamilyData*>& cfds_to_flush,
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const autovector<const autovector<MemTable*>*>& memtables_to_flush);
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// Fix user-supplied options to be reasonable
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template <class T, class V>
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@ -584,7 +584,7 @@ Status DBImpl::AtomicFlushMemTablesToOutputFiles(
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s = InstallMemtableAtomicFlushResults(
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nullptr /* imm_lists */, tmp_cfds, mutable_cf_options_list, mems_list,
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versions_.get(), &mutex_, tmp_file_meta,
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versions_.get(), &logs_with_prep_tracker_, &mutex_, tmp_file_meta,
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&job_context->memtables_to_free, directories_.GetDbDir(), log_buffer);
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}
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@ -659,13 +659,15 @@ uint64_t FindMinPrepLogReferencedByMemTable(
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// we must look through the memtables for two phase transactions
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// that have been committed but not yet flushed
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std::unordered_set<MemTable*> memtables_to_flush_set(
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memtables_to_flush.begin(), memtables_to_flush.end());
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for (auto loop_cfd : *vset->GetColumnFamilySet()) {
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if (loop_cfd->IsDropped() || loop_cfd == cfd_to_flush) {
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continue;
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}
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auto log = loop_cfd->imm()->PrecomputeMinLogContainingPrepSection(
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memtables_to_flush);
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&memtables_to_flush_set);
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if (log > 0 && (min_log == 0 || log < min_log)) {
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min_log = log;
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@ -681,6 +683,37 @@ uint64_t FindMinPrepLogReferencedByMemTable(
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return min_log;
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}
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uint64_t FindMinPrepLogReferencedByMemTable(
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VersionSet* vset, const autovector<ColumnFamilyData*>& cfds_to_flush,
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const autovector<const autovector<MemTable*>*>& memtables_to_flush) {
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uint64_t min_log = 0;
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std::unordered_set<ColumnFamilyData*> cfds_to_flush_set(cfds_to_flush.begin(),
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cfds_to_flush.end());
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std::unordered_set<MemTable*> memtables_to_flush_set;
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for (const autovector<MemTable*>* memtables : memtables_to_flush) {
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memtables_to_flush_set.insert(memtables->begin(), memtables->end());
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}
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for (auto loop_cfd : *vset->GetColumnFamilySet()) {
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if (loop_cfd->IsDropped() || cfds_to_flush_set.count(loop_cfd)) {
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continue;
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}
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auto log = loop_cfd->imm()->PrecomputeMinLogContainingPrepSection(
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&memtables_to_flush_set);
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if (log > 0 && (min_log == 0 || log < min_log)) {
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min_log = log;
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}
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log = loop_cfd->mem()->GetMinLogContainingPrepSection();
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if (log > 0 && (min_log == 0 || log < min_log)) {
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min_log = log;
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}
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}
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return min_log;
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}
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uint64_t PrecomputeMinLogNumberToKeepNon2PC(
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VersionSet* vset, const ColumnFamilyData& cfd_to_flush,
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const autovector<VersionEdit*>& edit_list) {
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@ -788,6 +821,38 @@ uint64_t PrecomputeMinLogNumberToKeep2PC(
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return min_log_number_to_keep;
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}
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uint64_t PrecomputeMinLogNumberToKeep2PC(
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VersionSet* vset, const autovector<ColumnFamilyData*>& cfds_to_flush,
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const autovector<autovector<VersionEdit*>>& edit_lists,
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const autovector<const autovector<MemTable*>*>& memtables_to_flush,
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LogsWithPrepTracker* prep_tracker) {
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assert(vset != nullptr);
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assert(prep_tracker != nullptr);
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assert(cfds_to_flush.size() == edit_lists.size());
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assert(cfds_to_flush.size() == memtables_to_flush.size());
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uint64_t min_log_number_to_keep =
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PrecomputeMinLogNumberToKeepNon2PC(vset, cfds_to_flush, edit_lists);
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uint64_t min_log_in_prep_heap =
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prep_tracker->FindMinLogContainingOutstandingPrep();
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if (min_log_in_prep_heap != 0 &&
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min_log_in_prep_heap < min_log_number_to_keep) {
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min_log_number_to_keep = min_log_in_prep_heap;
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}
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uint64_t min_log_refed_by_mem = FindMinPrepLogReferencedByMemTable(
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vset, cfds_to_flush, memtables_to_flush);
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if (min_log_refed_by_mem != 0 &&
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min_log_refed_by_mem < min_log_number_to_keep) {
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min_log_number_to_keep = min_log_refed_by_mem;
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}
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return min_log_number_to_keep;
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}
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Status DBImpl::SetDBId() {
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Status s;
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// Happens when immutable_db_options_.write_dbid_to_manifest is set to true
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@ -412,8 +412,9 @@ TEST_F(FlushJobTest, FlushMemtablesMultipleColumnFamilies) {
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Status s = InstallMemtableAtomicFlushResults(
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nullptr /* imm_lists */, all_cfds, mutable_cf_options_list, mems_list,
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versions_.get(), &mutex_, file_meta_ptrs, &job_context.memtables_to_free,
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nullptr /* db_directory */, nullptr /* log_buffer */);
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versions_.get(), nullptr /* prep_tracker */, &mutex_, file_meta_ptrs,
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&job_context.memtables_to_free, nullptr /* db_directory */,
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nullptr /* log_buffer */);
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ASSERT_OK(s);
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mutex_.Unlock();
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@ -674,20 +674,11 @@ void MemTableList::RemoveMemTablesOrRestoreFlags(
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}
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uint64_t MemTableList::PrecomputeMinLogContainingPrepSection(
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const autovector<MemTable*>& memtables_to_flush) {
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const std::unordered_set<MemTable*>* memtables_to_flush) {
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uint64_t min_log = 0;
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for (auto& m : current_->memlist_) {
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// Assume the list is very short, we can live with O(m*n). We can optimize
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// if the performance has some problem.
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bool should_skip = false;
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for (MemTable* m_to_flush : memtables_to_flush) {
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if (m == m_to_flush) {
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should_skip = true;
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break;
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}
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}
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if (should_skip) {
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if (memtables_to_flush && memtables_to_flush->count(m)) {
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continue;
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}
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@ -707,7 +698,8 @@ Status InstallMemtableAtomicFlushResults(
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const autovector<ColumnFamilyData*>& cfds,
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const autovector<const MutableCFOptions*>& mutable_cf_options_list,
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const autovector<const autovector<MemTable*>*>& mems_list, VersionSet* vset,
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InstrumentedMutex* mu, const autovector<FileMetaData*>& file_metas,
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LogsWithPrepTracker* prep_tracker, InstrumentedMutex* mu,
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const autovector<FileMetaData*>& file_metas,
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autovector<MemTable*>* to_delete, FSDirectory* db_directory,
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LogBuffer* log_buffer) {
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AutoThreadOperationStageUpdater stage_updater(
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@ -752,14 +744,21 @@ Status InstallMemtableAtomicFlushResults(
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edit_lists.emplace_back(edits);
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}
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// TODO(cc): after https://github.com/facebook/rocksdb/pull/7570, handle 2pc
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// here.
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WalNumber min_wal_number_to_keep = 0;
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if (vset->db_options()->allow_2pc) {
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min_wal_number_to_keep = PrecomputeMinLogNumberToKeep2PC(
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vset, cfds, edit_lists, mems_list, prep_tracker);
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edit_lists.back().back()->SetMinLogNumberToKeep(min_wal_number_to_keep);
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}
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std::unique_ptr<VersionEdit> wal_deletion;
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if (vset->db_options()->track_and_verify_wals_in_manifest) {
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uint64_t min_wal_number_to_keep =
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if (vset->db_options()->track_and_verify_wals_in_manifest &&
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!vset->GetWalSet().GetWals().empty()) {
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if (!vset->db_options()->allow_2pc) {
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min_wal_number_to_keep =
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PrecomputeMinLogNumberToKeepNon2PC(vset, cfds, edit_lists);
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const auto& wals = vset->GetWalSet().GetWals();
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if (!wals.empty() && min_wal_number_to_keep > wals.begin()->first) {
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}
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if (min_wal_number_to_keep > vset->GetWalSet().GetWals().begin()->first) {
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wal_deletion.reset(new VersionEdit);
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wal_deletion->DeleteWalsBefore(min_wal_number_to_keep);
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edit_lists.back().push_back(wal_deletion.get());
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@ -138,8 +138,8 @@ class MemTableListVersion {
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const autovector<ColumnFamilyData*>& cfds,
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const autovector<const MutableCFOptions*>& mutable_cf_options_list,
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const autovector<const autovector<MemTable*>*>& mems_list,
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VersionSet* vset, InstrumentedMutex* mu,
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const autovector<FileMetaData*>& file_meta,
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VersionSet* vset, LogsWithPrepTracker* prep_tracker,
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InstrumentedMutex* mu, const autovector<FileMetaData*>& file_meta,
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autovector<MemTable*>* to_delete, FSDirectory* db_directory,
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LogBuffer* log_buffer);
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@ -335,7 +335,7 @@ class MemTableList {
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// Returns the min log containing the prep section after memtables listsed in
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// `memtables_to_flush` are flushed and their status is persisted in manifest.
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uint64_t PrecomputeMinLogContainingPrepSection(
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const autovector<MemTable*>& memtables_to_flush);
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const std::unordered_set<MemTable*>* memtables_to_flush = nullptr);
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uint64_t GetEarliestMemTableID() const {
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auto& memlist = current_->memlist_;
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@ -381,8 +381,8 @@ class MemTableList {
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const autovector<ColumnFamilyData*>& cfds,
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const autovector<const MutableCFOptions*>& mutable_cf_options_list,
|
||||
const autovector<const autovector<MemTable*>*>& mems_list,
|
||||
VersionSet* vset, InstrumentedMutex* mu,
|
||||
const autovector<FileMetaData*>& file_meta,
|
||||
VersionSet* vset, LogsWithPrepTracker* prep_tracker,
|
||||
InstrumentedMutex* mu, const autovector<FileMetaData*>& file_meta,
|
||||
autovector<MemTable*>* to_delete, FSDirectory* db_directory,
|
||||
LogBuffer* log_buffer);
|
||||
|
||||
@ -431,7 +431,8 @@ extern Status InstallMemtableAtomicFlushResults(
|
||||
const autovector<ColumnFamilyData*>& cfds,
|
||||
const autovector<const MutableCFOptions*>& mutable_cf_options_list,
|
||||
const autovector<const autovector<MemTable*>*>& mems_list, VersionSet* vset,
|
||||
InstrumentedMutex* mu, const autovector<FileMetaData*>& file_meta,
|
||||
LogsWithPrepTracker* prep_tracker, InstrumentedMutex* mu,
|
||||
const autovector<FileMetaData*>& file_meta,
|
||||
autovector<MemTable*>* to_delete, FSDirectory* db_directory,
|
||||
LogBuffer* log_buffer);
|
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
|
@ -185,8 +185,9 @@ class MemTableListTest : public testing::Test {
|
||||
InstrumentedMutex mutex;
|
||||
InstrumentedMutexLock l(&mutex);
|
||||
return InstallMemtableAtomicFlushResults(
|
||||
&lists, cfds, mutable_cf_options_list, mems_list, &versions, &mutex,
|
||||
file_meta_ptrs, to_delete, nullptr, &log_buffer);
|
||||
&lists, cfds, mutable_cf_options_list, mems_list, &versions,
|
||||
nullptr /* prep_tracker */, &mutex, file_meta_ptrs, to_delete, nullptr,
|
||||
&log_buffer);
|
||||
}
|
||||
};
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user