org.apache.hadoop.hive.metastore.txn.AcidWriteSetService Maven / Gradle / Ivy

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/*
 * 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.metastore.txn;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.metastore.MetastoreTaskThread;
import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
import com.facebook.presto.hive.$internal.org.slf4j.Logger;
import com.facebook.presto.hive.$internal.org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Periodically cleans WriteSet tracking information used in Transaction management
 */
public class AcidWriteSetService implements MetastoreTaskThread {
  private static final Logger LOG = LoggerFactory.getLogger(AcidWriteSetService.class);

  private Configuration conf;
  private TxnStore txnHandler;

  @Override
  public void setConf(Configuration configuration) {
    this.conf = configuration;
    txnHandler = TxnUtils.getTxnStore(conf);
  }

  @Override
  public Configuration getConf() {
    return conf;
  }

  @Override
  public long runFrequency(TimeUnit unit) {
    return MetastoreConf.getTimeVar(conf, MetastoreConf.ConfVars.WRITE_SET_REAPER_INTERVAL, unit);
  }

  @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();
      LOG.debug("cleaner ran for " + (System.currentTimeMillis() - startTime)/1000 + "seconds.");
    } catch(Throwable t) {
      LOG.error("Serious error in {}", Thread.currentThread().getName(), ": {}" + t.getMessage(), t);
    } finally {
      if(handle != null) {
        handle.releaseLocks();
      }
    }
  }
}