/**
* 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.exec.tez;
import com.facebook.presto.hive.shaded.org.apache.commons.logging.Log;
import com.facebook.presto.hive.shaded.org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.io.ReadaheadPool;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.tez.common.TezUtils;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.LogicalIOProcessor;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.LogicalOutput;
import org.apache.tez.runtime.api.TezProcessorContext;
import java.net.URL;
import java.net.JarURLConnection;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import javax.crypto.Mac;
/**
* A simple sleep processor implementation that sleeps for the configured
* time in milliseconds.
*
* @see Config for configuring the HivePreWarmProcessor
*/
public class HivePreWarmProcessor implements LogicalIOProcessor {
private static boolean prewarmed = false;
private static final Log LOG = LogFactory.getLog(HivePreWarmProcessor.class);
private Configuration conf;
@Override
public void initialize(TezProcessorContext processorContext)
throws Exception {
byte[] userPayload = processorContext.getUserPayload();
this.conf = TezUtils.createConfFromUserPayload(userPayload);
}
@Override
public void run(Map<String, LogicalInput> inputs,
Map<String, LogicalOutput> outputs) throws Exception {
if(prewarmed) {
/* container reuse */
return;
}
for (LogicalInput input : inputs.values()) {
input.start();
}
for (LogicalOutput output : outputs.values()) {
output.start();
}
/* these are things that goes through singleton initialization on most queries */
FileSystem fs = FileSystem.get(conf);
Mac mac = Mac.getInstance("HmacSHA1");
ReadaheadPool rpool = ReadaheadPool.getInstance();
ShimLoader.getHadoopShims();
URL hiveurl = new URL("jar:"+DagUtils.getInstance().getExecJarPathLocal()+"!/");
JarURLConnection hiveconn = (JarURLConnection)hiveurl.openConnection();
JarFile hivejar = hiveconn.getJarFile();
try {
Enumeration<JarEntry> classes = hivejar.entries();
while(classes.hasMoreElements()) {
JarEntry je = classes.nextElement();
if (je.getName().endsWith(".class")) {
String klass = je.getName().replace(".class","").replaceAll("/","\\.");
if(klass.indexOf("ql.exec") != -1 || klass.indexOf("ql.io") != -1) {
/* several hive classes depend on the metastore APIs, which is not included
* in hive-exec.jar. These are the relatively safe ones - operators & io classes.
*/
if(klass.indexOf("vector") != -1 || klass.indexOf("Operator") != -1) {
Class.forName(klass);
}
}
}
}
} finally {
hivejar.close();
}
prewarmed = true;
}
@Override
public void handleEvents(List<Event> processorEvents) {
// Nothing to do
}
@Override
public void close() throws Exception {
// Nothing to cleanup
}
}