/**
* 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.falcon.logging.v2;
import org.apache.falcon.logging.DefaultTaskLogRetriever;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.TaskCompletionEvent;
import org.apache.hadoop.mapreduce.Cluster;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobID;
import org.apache.hadoop.mapreduce.v2.LogParams;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Hadoop Yarn task log retriever
*/
public class TaskLogRetrieverYarn extends DefaultTaskLogRetriever {
private static final Logger LOG = LoggerFactory.getLogger(TaskLogRetrieverYarn.class);
protected static final String SCHEME = "http://";
protected static final String YARN_LOG_SERVER_URL = "yarn.log.server.url";
@Override
public List<String> retrieveTaskLogURL(String jobIdStr) throws IOException {
List<String> taskLogUrls = new ArrayList<String>();
Configuration conf = getConf();
Cluster cluster = getCluster(conf);
JobID jobID = JobID.forName(jobIdStr);
if (jobID == null) {
LOG.warn("External id for workflow action is null");
return null;
}
try {
Job job = cluster.getJob(jobID);
if (job != null) {
TaskCompletionEvent[] events = job.getTaskCompletionEvents(0);
for (TaskCompletionEvent event : events) {
LogParams params = cluster.getLogParams(jobID, event.getTaskAttemptId());
String url = SCHEME + conf.get(YARN_LOG_SERVER_URL) + "/"
+ event.getTaskTrackerHttp() + "/"
+ params.getContainerId() + "/"
+ params.getApplicationId() + "/"
+ params.getOwner() + "?start=0";
LOG.info("Task Log URL for the job {} is {}" + jobIdStr, url);
taskLogUrls.add(url);
}
return taskLogUrls;
}
LOG.warn("Unable to find the job in cluster {}" + jobIdStr);
return null;
} catch (InterruptedException e) {
throw new IOException(e);
}
}
protected Cluster getCluster(Configuration conf) throws IOException {
return new Cluster(conf);
}
}