| /* |
| * 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.pig.backend.hadoop.executionengine.shims; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapred.Counters; |
| import org.apache.hadoop.mapred.JobClient; |
| import org.apache.hadoop.mapred.RunningJob; |
| import org.apache.hadoop.mapred.jobcontrol.Job; |
| import org.apache.hadoop.mapred.jobcontrol.JobControl; |
| import org.apache.hadoop.mapred.TaskReport; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.JobID; |
| import org.apache.hadoop.mapreduce.OutputCommitter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.TaskAttemptID; |
| import org.apache.hadoop.mapreduce.TaskType; |
| import org.apache.pig.PigConfiguration; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRConfiguration; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore; |
| import org.apache.pig.backend.hadoop20.PigJobControl; |
| |
| /** |
| * We need to make Pig work with both hadoop 20 and hadoop 23 (PIG-2125). However, |
| * there is API differences between hadoop 20 and 23. Here we use a shims layer to |
| * hide these API differences. A dynamic shims layer is not possible due to some |
| * static dependencies. We adopt a static shims approach. For different hadoop version, |
| * we need to recompile. |
| * |
| * This class wrapping all static method. PigMapReduce, PigMapBase, MiniCluster wrapping hadoop |
| * version dependant implementation of PigGenericMapReduce, PigGenericMapBase and MiniGenericCluster. |
| **/ |
| public class HadoopShims { |
| |
| private static Log LOG = LogFactory.getLog(HadoopShims.class); |
| |
| static public JobContext cloneJobContext(JobContext original) throws IOException, InterruptedException { |
| JobContext newContext = new JobContext(original.getConfiguration(), original.getJobID()); |
| return newContext; |
| } |
| |
| static public TaskAttemptContext createTaskAttemptContext(Configuration conf, |
| TaskAttemptID taskId) { |
| TaskAttemptContext newContext = new TaskAttemptContext(conf, |
| taskId); |
| return newContext; |
| } |
| |
| static public JobContext createJobContext(Configuration conf, |
| JobID jobId) { |
| JobContext newJobContext = new JobContext( |
| conf, jobId); |
| return newJobContext; |
| } |
| |
| static public boolean isMap(TaskAttemptID taskAttemptID) { |
| return taskAttemptID.isMap(); |
| } |
| |
| static public TaskAttemptID getNewTaskAttemptID() { |
| return new TaskAttemptID(); |
| } |
| |
| static public TaskAttemptID createTaskAttemptID(String jtIdentifier, int jobId, boolean isMap, |
| int taskId, int id) { |
| return new TaskAttemptID(jtIdentifier, jobId, isMap, taskId, id); |
| } |
| |
| static public void storeSchemaForLocal(Job job, POStore st) throws IOException { |
| JobContext jc = HadoopShims.createJobContext(job.getJobConf(), |
| new org.apache.hadoop.mapreduce.JobID()); |
| JobContext updatedJc = PigOutputCommitter.setUpContext(jc, st); |
| PigOutputCommitter.storeCleanup(st, updatedJc.getConfiguration()); |
| } |
| |
| static public String getFsCounterGroupName() { |
| return "FileSystemCounters"; |
| } |
| |
| static public void commitOrCleanup(OutputCommitter oc, JobContext jc) throws IOException { |
| oc.cleanupJob(jc); |
| } |
| |
| public static JobControl newJobControl(String groupName, int timeToSleep) { |
| return new PigJobControl(groupName, timeToSleep); |
| } |
| |
| public static long getDefaultBlockSize(FileSystem fs, Path path) { |
| return fs.getDefaultBlockSize(); |
| } |
| |
| public static Counters getCounters(Job job) throws IOException { |
| JobClient jobClient = job.getJobClient(); |
| return jobClient.getJob(job.getAssignedJobID()).getCounters(); |
| } |
| |
| public static boolean isJobFailed(TaskReport report) { |
| float successfulProgress = 1.0f; |
| // if the progress reported is not 1.0f then the map or reduce |
| // job failed |
| // this comparison is in place for the backward compatibility |
| // for Hadoop 0.20 |
| return report.getProgress() != successfulProgress; |
| } |
| |
| public static void unsetConf(Configuration conf, String key) { |
| // Not supported in Hadoop 0.20/1.x |
| } |
| |
| /** |
| * Fetch mode needs to explicitly set the task id which is otherwise done by Hadoop |
| * @param conf |
| * @param taskAttemptID |
| */ |
| public static void setTaskAttemptId(Configuration conf, TaskAttemptID taskAttemptID) { |
| conf.set(MRConfiguration.TASK_ID, taskAttemptID.toString()); |
| } |
| |
| /** |
| * Returns whether the give path has a FileSystem implementation. |
| * |
| * @param path path |
| * @param conf configuration |
| * @return true if the give path's scheme has a FileSystem implementation, |
| * false otherwise |
| */ |
| public static boolean hasFileSystemImpl(Path path, Configuration conf) { |
| String scheme = path.toUri().getScheme(); |
| if (scheme != null) { |
| String fsImpl = conf.get("fs." + scheme + ".impl"); |
| if (fsImpl == null) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Returns the progress of a Job j which is part of a submitted JobControl |
| * object. The progress is for this Job. So it has to be scaled down by the |
| * num of jobs that are present in the JobControl. |
| * |
| * @param j The Job for which progress is required |
| * @return Returns the percentage progress of this Job |
| * @throws IOException |
| */ |
| public static double progressOfRunningJob(Job j) |
| throws IOException { |
| RunningJob rj = j.getJobClient().getJob(j.getAssignedJobID()); |
| if (rj == null && j.getState() == Job.SUCCESS) |
| return 1; |
| else if (rj == null) |
| return 0; |
| else { |
| return (rj.mapProgress() + rj.reduceProgress()) / 2; |
| } |
| } |
| |
| public static void killJob(Job job) throws IOException { |
| RunningJob runningJob = job.getJobClient().getJob(job.getAssignedJobID()); |
| if (runningJob != null) |
| runningJob.killJob(); |
| } |
| |
| public static Iterator<TaskReport> getTaskReports(Job job, TaskType type) throws IOException { |
| if (job.getJobConf().getBoolean(PigConfiguration.PIG_NO_TASK_REPORT, false)) { |
| LOG.info("TaskReports are disabled for job: " + job.getAssignedJobID()); |
| return null; |
| } |
| JobClient jobClient = job.getJobClient(); |
| TaskReport[] reports = null; |
| if (type == TaskType.MAP) { |
| reports = jobClient.getMapTaskReports(job.getAssignedJobID()); |
| } else { |
| reports = jobClient.getReduceTaskReports(job.getAssignedJobID()); |
| } |
| return reports == null ? null : Arrays.asList(reports).iterator(); |
| } |
| |
| public static boolean isHadoopYARN() { |
| return false; |
| } |
| } |