| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 "kudu/consensus/consensus_meta_manager.h" |
| |
| #include <mutex> |
| #include <utility> |
| |
| #include <glog/logging.h> |
| |
| #include "kudu/consensus/consensus_meta.h" |
| #include "kudu/fs/fs_manager.h" |
| #include "kudu/gutil/map-util.h" |
| #include "kudu/gutil/strings/substitute.h" |
| #include "kudu/util/status.h" |
| |
| namespace kudu { |
| namespace consensus { |
| |
| using std::lock_guard; |
| using std::string; |
| using strings::Substitute; |
| |
| ConsensusMetadataManager::ConsensusMetadataManager(FsManager* fs_manager) |
| : fs_manager_(DCHECK_NOTNULL(fs_manager)) { |
| } |
| |
| Status ConsensusMetadataManager::Create(const string& tablet_id, |
| const RaftConfigPB& config, |
| int64_t initial_term, |
| ConsensusMetadataCreateMode create_mode, |
| scoped_refptr<ConsensusMetadata>* cmeta_out) { |
| scoped_refptr<ConsensusMetadata> cmeta; |
| RETURN_NOT_OK_PREPEND(ConsensusMetadata::Create(fs_manager_, tablet_id, fs_manager_->uuid(), |
| config, initial_term, create_mode, |
| &cmeta), |
| Substitute("Unable to create consensus metadata for tablet $0", tablet_id)); |
| |
| lock_guard<Mutex> l(lock_); |
| if (!InsertIfNotPresent(&cmeta_cache_, tablet_id, cmeta)) { |
| return Status::AlreadyPresent(Substitute("ConsensusMetadata instance for $0 already exists", |
| tablet_id)); |
| } |
| if (cmeta_out) *cmeta_out = std::move(cmeta); |
| return Status::OK(); |
| } |
| |
| Status ConsensusMetadataManager::Load(const string& tablet_id, |
| scoped_refptr<ConsensusMetadata>* cmeta_out) { |
| { |
| lock_guard<Mutex> l(lock_); |
| |
| // Try to get the cmeta instance from cache first. |
| scoped_refptr<ConsensusMetadata>* cached_cmeta = FindOrNull(cmeta_cache_, tablet_id); |
| if (cached_cmeta) { |
| if (cmeta_out) *cmeta_out = *cached_cmeta; |
| return Status::OK(); |
| } |
| } |
| |
| // If it's not yet cached, drop the lock before we load it. |
| scoped_refptr<ConsensusMetadata> cmeta; |
| RETURN_NOT_OK_PREPEND(ConsensusMetadata::Load(fs_manager_, tablet_id, fs_manager_->uuid(), |
| &cmeta), |
| Substitute("Unable to load consensus metadata for tablet $0", tablet_id)); |
| |
| // Cache and return the loaded ConsensusMetadata. |
| { |
| lock_guard<Mutex> l(lock_); |
| // Due to our thread-safety contract, no other caller may have interleaved |
| // with us for this tablet id, so we use InsertOrDie(). |
| InsertOrDie(&cmeta_cache_, tablet_id, cmeta); |
| } |
| |
| if (cmeta_out) *cmeta_out = std::move(cmeta); |
| return Status::OK(); |
| } |
| |
| Status ConsensusMetadataManager::LoadOrCreate(const string& tablet_id, |
| const RaftConfigPB& config, |
| int64_t initial_term, |
| ConsensusMetadataCreateMode create_mode, |
| scoped_refptr<ConsensusMetadata>* cmeta_out) { |
| Status s = Load(tablet_id, cmeta_out); |
| if (s.IsNotFound()) { |
| return Create(tablet_id, config, initial_term, create_mode, cmeta_out); |
| } |
| return s; |
| } |
| |
| Status ConsensusMetadataManager::Delete(const string& tablet_id) { |
| { |
| lock_guard<Mutex> l(lock_); |
| cmeta_cache_.erase(tablet_id); // OK to delete an uncached cmeta; ignore the return value. |
| } |
| RETURN_NOT_OK_PREPEND(ConsensusMetadata::DeleteOnDiskData(fs_manager_, tablet_id), |
| Substitute("Unable to delete consensus metadata for tablet $0", tablet_id)); |
| return Status::OK(); |
| } |
| |
| } // namespace consensus |
| } // namespace kudu |