org.apache.hadoop.hive.ql.hooks.UpdateInputAccessTimeHook 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.hooks;
import java.util.Set;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.hive.ql.metadata.Hive;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.Partition;
import org.apache.hadoop.hive.ql.metadata.Table;
/**
* Implementation of a pre execute hook that updates the access
* times for all the inputs.
*/
public class UpdateInputAccessTimeHook {
private static final String LAST_ACCESS_TIME = "lastAccessTime";
public static class PreExec implements PreExecute {
public void run(SessionState sess, Set inputs,
Set outputs, UserGroupInformation ugi)
throws Exception {
Hive db;
try {
db = Hive.get(sess.getConf());
} catch (HiveException e) {
// ignore
db = null;
return;
}
int lastAccessTime = (int) (System.currentTimeMillis()/1000);
for(ReadEntity re: inputs) {
// Set the last query time
ReadEntity.Type typ = re.getType();
switch(typ) {
// It is possible that read and write entities contain a old version
// of the object, before it was modified by StatsTask.
// Get the latest versions of the object
case TABLE: {
Table t = db.getTable(re.getTable().getTableName());
t.setLastAccessTime(lastAccessTime);
db.alterTable(t.getDbName() + "." + t.getTableName(), t, null);
break;
}
case PARTITION: {
Partition p = re.getPartition();
Table t = db.getTable(p.getTable().getTableName());
p = db.getPartition(t, p.getSpec(), false);
p.setLastAccessTime(lastAccessTime);
db.alterPartition(t.getTableName(), p, null);
t.setLastAccessTime(lastAccessTime);
db.alterTable(t.getDbName() + "." + t.getTableName(), t, null);
break;
}
default:
// ignore dummy inputs
break;
}
}
}
}
}