| /* |
| * 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; |
| import org.apache.cassandra.utils.concurrent.WaitQueue; |
| |
| class PeriodicCommitLogService extends AbstractCommitLogService |
| { |
| private static final int blockWhenSyncLagsMillis = (int) (DatabaseDescriptor.getCommitLogSyncPeriod() * 1.5); |
| |
| public PeriodicCommitLogService(final CommitLog commitLog) |
| { |
| super(commitLog, "PERIODIC-COMMIT-LOG-SYNCER", DatabaseDescriptor.getCommitLogSyncPeriod(), |
| !commitLog.configuration.useCompression()); |
| } |
| |
| protected void maybeWaitForSync(CommitLogSegment.Allocation alloc) |
| { |
| if (waitForSyncToCatchUp(Long.MAX_VALUE)) |
| { |
| // wait until periodic sync() catches up with its schedule |
| long started = System.currentTimeMillis(); |
| pending.incrementAndGet(); |
| while (waitForSyncToCatchUp(started)) |
| { |
| WaitQueue.Signal signal = syncComplete.register(commitLog.metrics.waitingOnCommit.time()); |
| if (waitForSyncToCatchUp(started)) |
| signal.awaitUninterruptibly(); |
| else |
| signal.cancel(); |
| } |
| pending.decrementAndGet(); |
| } |
| } |
| |
| /** |
| * @return true if sync is currently lagging behind inserts |
| */ |
| private boolean waitForSyncToCatchUp(long started) |
| { |
| return started > lastSyncedAt + blockWhenSyncLagsMillis; |
| } |
| } |