HBASE-5861 ADDENDUM (missed new MapredcueTestingShim.java file)
git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1330078 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hbase.mapreduce;
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import java.io.IOException;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.mapreduce.Job;
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import org.apache.hadoop.mapreduce.JobContext;
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import org.apache.hadoop.mapreduce.JobID;
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/**
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* This class provides shims for HBase to interact with the Hadoop 1.0.x and the
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* Hadoop 0.23.x series.
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*
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* NOTE: No testing done against 0.22.x, or 0.21.x.
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*/
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abstract public class MapreduceTestingShim {
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private static MapreduceTestingShim instance;
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static {
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try {
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// This class exists in hadoop 0.22+ but not in Hadoop 20.x/1.x
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Class c = Class
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.forName("org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl");
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instance = new MapreduceV2Shim();
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} catch (Exception e) {
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instance = new MapreduceV1Shim();
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}
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}
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abstract public JobContext newJobContext(Configuration jobConf)
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throws IOException;
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public static JobContext createJobContext(Configuration jobConf)
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throws IOException {
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return instance.newJobContext(jobConf);
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}
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private static class MapreduceV1Shim extends MapreduceTestingShim {
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public JobContext newJobContext(Configuration jobConf) throws IOException {
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// Implementing:
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// return new JobContext(jobConf, new JobID());
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JobID jobId = new JobID();
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Constructor<JobContext> c;
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try {
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c = JobContext.class.getConstructor(Configuration.class, JobID.class);
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return c.newInstance(jobConf, jobId);
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} catch (Exception e) {
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throw new IllegalStateException(
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"Failed to instantiate new JobContext(jobConf, new JobID())", e);
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}
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}
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};
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private static class MapreduceV2Shim extends MapreduceTestingShim {
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public JobContext newJobContext(Configuration jobConf) {
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// Implementing:
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// return Job.getInstance(jobConf);
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try {
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Method m = Job.class.getMethod("getInstance", Configuration.class);
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return (JobContext) m.invoke(null, jobConf); // static method, then arg
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} catch (Exception e) {
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e.printStackTrace();
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throw new IllegalStateException(
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"Failed to return from Job.getInstance(jobConf)");
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}
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}
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};
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}
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