org.apache.hadoop.hive.ql.txn.AcidWriteSetService Maven / Gradle / Ivy
/**
* 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.hadoop.hive.ql.txn;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.txn.TxnStore;
import org.apache.hadoop.hive.metastore.txn.TxnUtils;
import org.apache.hadoop.hive.ql.txn.compactor.HouseKeeperServiceBase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Periodically cleans WriteSet tracking information used in Transaction management
*/
public class AcidWriteSetService extends HouseKeeperServiceBase {
private static final Logger LOG = LoggerFactory.getLogger(AcidWriteSetService.class);
@Override
protected long getStartDelayMs() {
return 0;
}
@Override
protected long getIntervalMs() {
return hiveConf.getTimeVar(HiveConf.ConfVars.WRITE_SET_REAPER_INTERVAL, TimeUnit.MILLISECONDS);
}
@Override
protected Runnable getScheduedAction(HiveConf hiveConf, AtomicInteger isAliveCounter) {
return new WriteSetReaper(hiveConf, isAliveCounter);
}
@Override
public String getServiceDescription() {
return "Periodically cleans obsolete WriteSet tracking information used in Transaction management";
}
private static final class WriteSetReaper implements Runnable {
private final TxnStore txnHandler;
private final AtomicInteger isAliveCounter;
private WriteSetReaper(HiveConf hiveConf, AtomicInteger isAliveCounter) {
txnHandler = TxnUtils.getTxnStore(hiveConf);
this.isAliveCounter = isAliveCounter;
}
@Override
public void run() {
TxnStore.MutexAPI.LockHandle handle = null;
try {
handle = txnHandler.getMutexAPI().acquireLock(TxnStore.MUTEX_KEY.WriteSetCleaner.name());
long startTime = System.currentTimeMillis();
txnHandler.performWriteSetGC();
int count = isAliveCounter.incrementAndGet();
LOG.info("cleaner ran for " + (System.currentTimeMillis() - startTime)/1000 + "seconds. isAliveCounter=" + count);
}
catch(Throwable t) {
LOG.error("Serious error in {}", Thread.currentThread().getName(), ": {}" + t.getMessage(), t);
}
finally {
if(handle != null) {
handle.releaseLocks();
}
}
}
}
}