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
This commit is contained in:
Jonathan Hsieh 2012-04-25 01:00:04 +00:00
parent 2a853d4a96
commit 917a07b73f
1 changed files with 88 additions and 0 deletions

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/**
* 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.hbase.mapreduce;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.JobID;
/**
* This class provides shims for HBase to interact with the Hadoop 1.0.x and the
* Hadoop 0.23.x series.
*
* NOTE: No testing done against 0.22.x, or 0.21.x.
*/
abstract public class MapreduceTestingShim {
private static MapreduceTestingShim instance;
static {
try {
// This class exists in hadoop 0.22+ but not in Hadoop 20.x/1.x
Class c = Class
.forName("org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl");
instance = new MapreduceV2Shim();
} catch (Exception e) {
instance = new MapreduceV1Shim();
}
}
abstract public JobContext newJobContext(Configuration jobConf)
throws IOException;
public static JobContext createJobContext(Configuration jobConf)
throws IOException {
return instance.newJobContext(jobConf);
}
private static class MapreduceV1Shim extends MapreduceTestingShim {
public JobContext newJobContext(Configuration jobConf) throws IOException {
// Implementing:
// return new JobContext(jobConf, new JobID());
JobID jobId = new JobID();
Constructor<JobContext> c;
try {
c = JobContext.class.getConstructor(Configuration.class, JobID.class);
return c.newInstance(jobConf, jobId);
} catch (Exception e) {
throw new IllegalStateException(
"Failed to instantiate new JobContext(jobConf, new JobID())", e);
}
}
};
private static class MapreduceV2Shim extends MapreduceTestingShim {
public JobContext newJobContext(Configuration jobConf) {
// Implementing:
// return Job.getInstance(jobConf);
try {
Method m = Job.class.getMethod("getInstance", Configuration.class);
return (JobContext) m.invoke(null, jobConf); // static method, then arg
} catch (Exception e) {
e.printStackTrace();
throw new IllegalStateException(
"Failed to return from Job.getInstance(jobConf)");
}
}
};
}