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Optional sequence number exporting during checkpoint creation (#5528)

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Summary:
Add sequence_number_ptr to the checkpoint interface to expose the sequence number during taking the checkpoint. The number will be consistent with the seq # in rocksdb log.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5528

Test Plan: make check -j64

Reviewed By: Winger1994

Differential Revision: D16080209

fbshipit-source-id: 6dc3c7680287ee97d673c5e61f89aae1f43e33df
This commit is contained in:
Chao Zhao 2020-03-10 13:37:37 -07:00 committed by Facebook Github Bot
parent fd1da22111
commit 4028eba67b
3 changed files with 14 additions and 4 deletions
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6
include/rocksdb/utilities/checkpoint.h
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@ -37,8 +37,12 @@ class Checkpoint {
// away from the default, the checkpoint may not contain up-to-date data
// if WAL writing is not always enabled.
// Flush will always trigger if it is 2PC.
// sequence_number_ptr: if it is not nullptr, the value it points to will be
// set to the DB's sequence number. The default value of this parameter is
// nullptr.
virtual Status CreateCheckpoint(const std::string& checkpoint_dir,
uint64_t log_size_for_flush = 0);
uint64_t log_size_for_flush = 0,
uint64_t* sequence_number_ptr = nullptr);
// Exports all live SST files of a specified Column Family onto export_dir,
// returning SST files information in metadata.

9
utilities/checkpoint/checkpoint_impl.cc
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@ -35,7 +35,8 @@ Status Checkpoint::Create(DB* db, Checkpoint** checkpoint_ptr) {
}
Status Checkpoint::CreateCheckpoint(const std::string& /*checkpoint_dir*/,
uint64_t /*log_size_for_flush*/) {
uint64_t /*log_size_for_flush*/,
uint64_t* /*sequence_number_ptr*/) {
return Status::NotSupported("");
}
@ -69,7 +70,8 @@ Status Checkpoint::ExportColumnFamily(
// Builds an openable snapshot of RocksDB
Status CheckpointImpl::CreateCheckpoint(const std::string& checkpoint_dir,
uint64_t log_size_for_flush) {
uint64_t log_size_for_flush,
uint64_t* sequence_number_ptr) {
DBOptions db_options = db_->GetDBOptions();
Status s = db_->GetEnv()->FileExists(checkpoint_dir);
@ -145,6 +147,9 @@ Status CheckpointImpl::CreateCheckpoint(const std::string& checkpoint_dir,
}
if (s.ok()) {
if (sequence_number_ptr != nullptr) {
*sequence_number_ptr = sequence_number;
}
// here we know that we succeeded and installed the new snapshot
ROCKS_LOG_INFO(db_options.info_log, "Snapshot DONE. All is good");
ROCKS_LOG_INFO(db_options.info_log, "Snapshot sequence number: %" PRIu64,

3
utilities/checkpoint/checkpoint_impl.h
View File

@ -28,7 +28,8 @@ class CheckpointImpl : public Checkpoint {
// The directory will be an absolute path
using Checkpoint::CreateCheckpoint;
virtual Status CreateCheckpoint(const std::string& checkpoint_dir,
uint64_t log_size_for_flush) override;
uint64_t log_size_for_flush,
uint64_t* sequence_number_ptr) override;
// Exports all live SST files of a specified Column Family onto export_dir
// and returning SST files information in metadata.