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Palantir open source project
/*
* 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 org.apache.cassandra.config.DatabaseDescriptor;
/**
* A commitlog service that will block returning an ACK back to the a coordinator/client
* for a minimum amount of time as we wait until the the commit log segment is flushed.
*/
public class GroupCommitLogService extends AbstractCommitLogService
{
public GroupCommitLogService(CommitLog commitLog)
{
super(commitLog, "GROUP-COMMIT-LOG-WRITER", (int) DatabaseDescriptor.getCommitLogSyncGroupWindow());
}
protected void maybeWaitForSync(CommitLogSegment.Allocation alloc)
{
// wait until record has been safely persisted to disk
pending.incrementAndGet();
// wait for commitlog_sync_group_window_in_ms
alloc.awaitDiskSync(commitLog.metrics.waitingOnCommit);
pending.decrementAndGet();
}
}