org.apache.hadoop.hive.ql.hooks.UpdateInputAccessTimeHook Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.hadoop.hive.ql.hooks;
import java.util.Set;
import org.apache.hadoop.hive.conf.HiveConf;
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 ExecuteWithHookContext {
@Override
public void run(HookContext hookContext) throws Exception {
HiveConf conf = hookContext.getConf();
Set inputs = hookContext.getQueryPlan().getInputs();
Hive db;
try {
db = Hive.get(conf);
} 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: {
String dbName = re.getTable().getDbName();
String tblName = re.getTable().getTableName();
Table t = db.getTable(dbName, tblName);
t.setLastAccessTime(lastAccessTime);
db.alterTable(dbName + "." + tblName, t, null);
break;
}
case PARTITION: {
String dbName = re.getTable().getDbName();
String tblName = re.getTable().getTableName();
Partition p = re.getPartition();
Table t = db.getTable(dbName, tblName);
p = db.getPartition(t, p.getSpec(), false);
p.setLastAccessTime(lastAccessTime);
db.alterPartition(dbName, tblName, p, null);
t.setLastAccessTime(lastAccessTime);
db.alterTable(dbName + "." + tblName, t, null);
break;
}
default:
// ignore dummy inputs
break;
}
}
}
}
}