org.apache.hadoop.hive.ql.hooks.PreExecutePrinter 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.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.hive.ql.hooks.HookContext.HookType;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.ql.session.SessionState.LogHelper;
import org.apache.hadoop.security.UserGroupInformation;
/**
* Implementation of a pre execute hook that simply prints out its parameters to
* standard output.
*/
public class PreExecutePrinter implements ExecuteWithHookContext {
@Override
public void run(HookContext hookContext) throws Exception {
assert(hookContext.getHookType() == HookType.PRE_EXEC_HOOK);
SessionState ss = SessionState.get();
Set inputs = hookContext.getInputs();
Set outputs = hookContext.getOutputs();
UserGroupInformation ugi = hookContext.getUgi();
this.run(ss,inputs,outputs,ugi);
}
public void run(SessionState sess, Set inputs,
Set outputs, UserGroupInformation ugi)
throws Exception {
LogHelper console = SessionState.getConsole();
if (console == null) {
return;
}
if (sess != null) {
console.printError("PREHOOK: query: " + sess.getCmd().trim());
console.printError("PREHOOK: type: " + sess.getCommandType());
}
printEntities(console, inputs, "PREHOOK: Input: ");
printEntities(console, outputs, "PREHOOK: Output: ");
}
static void printEntities(LogHelper console, Set entities, String prefix) {
List strings = new ArrayList();
for (Object o : entities) {
strings.add(o.toString());
}
Collections.sort(strings);
for (String s : strings) {
console.printError(prefix + s);
}
}
}