/**
* 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.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.HTable;
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.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Tests various scan start and stop row scenarios. This is set in a scan and
* tested in a MapReduce job to see if that is handed over and done properly
* too.
*/
@Category(LargeTests.class)
public class TestMultiTableInputFormat {
static final Log LOG = LogFactory.getLog(TestMultiTableInputFormat.class);
static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
static final String TABLE_NAME = "scantest";
static final byte[] INPUT_FAMILY = Bytes.toBytes("contents");
static final String KEY_STARTROW = "startRow";
static final String KEY_LASTROW = "stpRow";
@BeforeClass
public static void setUpBeforeClass() throws Exception {
// switch TIF to log at DEBUG level
TEST_UTIL.enableDebug(MultiTableInputFormat.class);
TEST_UTIL.enableDebug(MultiTableInputFormatBase.class);
// start mini hbase cluster
TEST_UTIL.startMiniCluster(3);
// create and fill table
for (int i = 0; i < 3; i++) {
HTable table =
TEST_UTIL.createTable(TableName.valueOf(TABLE_NAME + String.valueOf(i)), INPUT_FAMILY);
TEST_UTIL.createMultiRegions(TEST_UTIL.getConfiguration(), table, INPUT_FAMILY, 4);
TEST_UTIL.loadTable(table, INPUT_FAMILY, false);
}
// start MR cluster
TEST_UTIL.startMiniMapReduceCluster();
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
TEST_UTIL.shutdownMiniMapReduceCluster();
TEST_UTIL.shutdownMiniCluster();
}
@After
public void tearDown() throws Exception {
Configuration c = TEST_UTIL.getConfiguration();
FileUtil.fullyDelete(new File(c.get("hadoop.tmp.dir")));
}
/**
* Pass the key and value to reducer.
*/
public static class ScanMapper extends
TableMapper<ImmutableBytesWritable, ImmutableBytesWritable> {
/**
* Pass the key and value to reduce.
*
* @param key The key, here "aaa", "aab" etc.
* @param value The value is the same as the key.
* @param context The task context.
* @throws IOException When reading the rows fails.
*/
@Override
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) + "'.");
}
String val = Bytes.toStringBinary(value.getValue(INPUT_FAMILY, null));
LOG.debug("map: key -> " + Bytes.toStringBinary(key.get()) +
", value -> " + val);
context.write(key, key);
}
}
/**
* Checks the last and first keys seen against the scanner boundaries.
*/
public static class ScanReducer
extends
Reducer<ImmutableBytesWritable, ImmutableBytesWritable,
NullWritable, NullWritable> {
private String first = null;
private String last = null;
protected void reduce(ImmutableBytesWritable key,
Iterable<ImmutableBytesWritable> values, Context context)
throws IOException, InterruptedException {
int count = 0;
for (ImmutableBytesWritable value : values) {
String val = Bytes.toStringBinary(value.get());
LOG.debug("reduce: key[" + count + "] -> " +
Bytes.toStringBinary(key.get()) + ", value -> " + val);
if (first == null) first = val;
last = val;
count++;
}
assertEquals(3, count);
}
protected void cleanup(Context context) throws IOException,
InterruptedException {
Configuration c = context.getConfiguration();
String startRow = c.get(KEY_STARTROW);
String lastRow = c.get(KEY_LASTROW);
LOG.info("cleanup: first -> \"" + first + "\", start row -> \"" +
startRow + "\"");
LOG.info("cleanup: last -> \"" + last + "\", last row -> \"" + lastRow +
"\"");
if (startRow != null && startRow.length() > 0) {
assertEquals(startRow, first);
}
if (lastRow != null && lastRow.length() > 0) {
assertEquals(lastRow, last);
}
}
}
@Test
public void testScanEmptyToEmpty() throws IOException, InterruptedException,
ClassNotFoundException {
testScan(null, null, null);
}
@Test
public void testScanEmptyToAPP() throws IOException, InterruptedException,
ClassNotFoundException {
testScan(null, "app", "apo");
}
@Test
public void testScanOBBToOPP() throws IOException, InterruptedException,
ClassNotFoundException {
testScan("obb", "opp", "opo");
}
@Test
public void testScanYZYToEmpty() throws IOException, InterruptedException,
ClassNotFoundException {
testScan("yzy", null, "zzz");
}
/**
* Tests a MR scan using specific start and stop rows.
*
* @throws IOException
* @throws ClassNotFoundException
* @throws InterruptedException
*/
private void testScan(String start, String stop, String last)
throws IOException, InterruptedException, ClassNotFoundException {
String jobName =
"Scan" + (start != null ? start.toUpperCase() : "Empty") + "To" +
(stop != null ? stop.toUpperCase() : "Empty");
LOG.info("Before map/reduce startup - job " + jobName);
Configuration c = new Configuration(TEST_UTIL.getConfiguration());
c.set(KEY_STARTROW, start != null ? start : "");
c.set(KEY_LASTROW, last != null ? last : "");
List<Scan> scans = new ArrayList<Scan>();
for(int i=0; i<3; i++){
Scan scan = new Scan();
scan.addFamily(INPUT_FAMILY);
scan.setAttribute(Scan.SCAN_ATTRIBUTES_TABLE_NAME, Bytes.toBytes(TABLE_NAME + i));
if (start != null) {
scan.setStartRow(Bytes.toBytes(start));
}
if (stop != null) {
scan.setStopRow(Bytes.toBytes(stop));
}
scans.add(scan);
LOG.info("scan before: " + scan);
}
Job job = new Job(c, jobName);
TableMapReduceUtil.initTableMapperJob(scans, ScanMapper.class,
ImmutableBytesWritable.class, ImmutableBytesWritable.class, job);
job.setReducerClass(ScanReducer.class);
job.setNumReduceTasks(1); // one to get final "first" and "last" key
FileOutputFormat.setOutputPath(job, new Path(job.getJobName()));
LOG.info("Started " + job.getJobName());
job.waitForCompletion(true);
assertTrue(job.isSuccessful());
LOG.info("After map/reduce completion - job " + jobName);
}
}