| /* |
| * 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. |
| */ |
| package org.apache.cassandra.db.commitlog; |
| |
| import static org.apache.cassandra.config.CassandraRelevantProperties.BATCH_COMMIT_LOG_SYNC_INTERVAL; |
| |
| class BatchCommitLogService extends AbstractCommitLogService |
| { |
| /** |
| * Batch mode does not rely on the sync thread in {@link AbstractCommitLogService} to wake up for triggering |
| * the disk sync. Instead we trigger it explicitly in {@link #maybeWaitForSync(CommitLogSegment.Allocation)}. |
| * This value here is largely irrelevant, but should high enough so the sync thread is not continually waking up. |
| */ |
| private static final int POLL_TIME_MILLIS = BATCH_COMMIT_LOG_SYNC_INTERVAL.getInt(); |
| |
| public BatchCommitLogService(CommitLog commitLog) |
| { |
| super(commitLog, "COMMIT-LOG-WRITER", POLL_TIME_MILLIS); |
| } |
| |
| protected void maybeWaitForSync(CommitLogSegment.Allocation alloc) |
| { |
| // wait until record has been safely persisted to disk |
| pending.incrementAndGet(); |
| requestExtraSync(); |
| alloc.awaitDiskSync(commitLog.metrics.waitingOnCommit); |
| pending.decrementAndGet(); |
| } |
| } |