org.apache.hadoop.hive.ql.HiveDriverRunHook 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.hadoop.hive.ql;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.ql.hooks.Hook;
/**
* HiveDriverRunHook allows Hive to be extended with custom
* logic for processing commands.
*
*
*
* Note that the lifetime of an instantiated hook object is scoped to
* the analysis of a single statement; hook instances are never reused.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface HiveDriverRunHook extends Hook {
/**
* Invoked before Hive begins any processing of a command in the Driver,
* notably before compilation and any customizable performance logging.
*/
void preDriverRun(HiveDriverRunHookContext hookContext) throws Exception;
/**
* Invoked after Hive performs any processing of a command, just before a
* response is returned to the entity calling the Driver.
*/
void postDriverRun(HiveDriverRunHookContext hookContext) throws Exception;
}