/**
*
* 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 static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.NavigableMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.junit.experimental.categories.Category;
/**
* Test Map/Reduce job over HBase tables. The map/reduce process we're testing
* on our tables is simple - take every row in the table, reverse the value of
* a particular cell, and write it back to the table.
*/
@Category(LargeTests.class)
public class TestTableMapReduce extends TestTableMapReduceBase {
private static final Log LOG = LogFactory.getLog(TestTableMapReduce.class);
protected Log getLog() { return LOG; }
/**
* Pass the given key and processed record reduce
*/
static class ProcessContentsMapper extends TableMapper<ImmutableBytesWritable, Put> {
/**
* Pass the key, and reversed value to reduce
*
* @param key
* @param value
* @param context
* @throws IOException
*/
public void map(ImmutableBytesWritable key, Result value,
Context context)
throws IOException, InterruptedException {
if (value.size() != 1) {
throw new IOException("There should only be one input column");
}
Map<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>>
cf = value.getMap();
if(!cf.containsKey(INPUT_FAMILY)) {
throw new IOException("Wrong input columns. Missing: '" +
Bytes.toString(INPUT_FAMILY) + "'.");
}
// Get the original value and reverse it
String originalValue = Bytes.toString(value.getValue(INPUT_FAMILY, null));
StringBuilder newValue = new StringBuilder(originalValue);
newValue.reverse();
// Now set the value to be collected
Put outval = new Put(key.get());
outval.add(OUTPUT_FAMILY, null, Bytes.toBytes(newValue.toString()));
context.write(key, outval);
}
}
protected void runTestOnTable(HTable table) throws IOException {
Job job = null;
try {
LOG.info("Before map/reduce startup");
job = new Job(table.getConfiguration(), "process column contents");
job.setNumReduceTasks(1);
Scan scan = new Scan();
scan.addFamily(INPUT_FAMILY);
TableMapReduceUtil.initTableMapperJob(
Bytes.toString(table.getTableName()), scan,
ProcessContentsMapper.class, ImmutableBytesWritable.class,
Put.class, job);
TableMapReduceUtil.initTableReducerJob(
Bytes.toString(table.getTableName()),
IdentityTableReducer.class, job);
FileOutputFormat.setOutputPath(job, new Path("test"));
LOG.info("Started " + Bytes.toString(table.getTableName()));
assertTrue(job.waitForCompletion(true));
LOG.info("After map/reduce completion");
// verify map-reduce results
verify(table.getName());
} catch (InterruptedException e) {
throw new IOException(e);
} catch (ClassNotFoundException e) {
throw new IOException(e);
} finally {
table.close();
if (job != null) {
FileUtil.fullyDelete(
new File(job.getConfiguration().get("hadoop.tmp.dir")));
}
}
}
}