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HBASE-3727 MultiHFileOutputFormat (yi liang)

This commit is contained in:
Jerry He 2016-07-15 21:07:12 -07:00
parent 84b7010a30
commit 60847a2d76
3 changed files with 548 additions and 191 deletions
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145
hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/HFileOutputFormat2.java
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@ -67,6 +67,7 @@ import org.apache.hadoop.hbase.regionserver.HStore;
import org.apache.hadoop.hbase.regionserver.StoreFile;
import org.apache.hadoop.hbase.regionserver.StoreFileWriter;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;
@ -131,51 +132,89 @@ public class HFileOutputFormat2
}
static <V extends Cell> RecordWriter<ImmutableBytesWritable, V>
createRecordWriter(final TaskAttemptContext context)
throws IOException {
createRecordWriter(final TaskAttemptContext context) throws IOException {
return new HFileRecordWriter<V>(context, null);
}
protected static class HFileRecordWriter<V extends Cell>
extends RecordWriter<ImmutableBytesWritable, V> {
private final TaskAttemptContext context;
private final Path outputPath;
private final Path outputDir;
private final Configuration conf;
private final FileSystem fs;
private final long maxsize;
private final Algorithm defaultCompression;
private final boolean compactionExclude;
private final Map<byte[], Algorithm> compressionMap;
private final Map<byte[], BloomType> bloomTypeMap;
private final Map<byte[], Integer> blockSizeMap;
private final Map<byte[], DataBlockEncoding> datablockEncodingMap;
private final DataBlockEncoding overriddenEncoding;
private final Map<byte[], WriterLength> writers;
private byte[] previousRow;
private final byte[] now;
private boolean rollRequested;
/**
* Mapredue job will create a temp path for outputting results. If out != null, it means that
* the caller has set the temp working dir; If out == null, it means we need to set it here.
* Used by HFileOutputFormat2 and MultiHFileOutputFormat. MultiHFileOutputFormat will give us
* temp working dir at the table level and HFileOutputFormat2 has to set it here within this
* constructor.
*/
public HFileRecordWriter(final TaskAttemptContext taContext, final Path out)
throws IOException {
// Get the path of the temporary output file
final Path outputPath = FileOutputFormat.getOutputPath(context);
final Path outputdir = new FileOutputCommitter(outputPath, context).getWorkPath();
final Configuration conf = context.getConfiguration();
final FileSystem fs = outputdir.getFileSystem(conf);
context = taContext;
if (out == null) {
outputPath = FileOutputFormat.getOutputPath(context);
outputDir = new FileOutputCommitter(outputPath, context).getWorkPath();
} else {
outputPath = out;
outputDir = outputPath;
}
conf = context.getConfiguration();
fs = outputDir.getFileSystem(conf);
// These configs. are from hbase-*.xml
final long maxsize = conf.getLong(HConstants.HREGION_MAX_FILESIZE,
HConstants.DEFAULT_MAX_FILE_SIZE);
maxsize = conf.getLong(HConstants.HREGION_MAX_FILESIZE, HConstants.DEFAULT_MAX_FILE_SIZE);
// Invented config. Add to hbase-*.xml if other than default compression.
final String defaultCompressionStr = conf.get("hfile.compression",
Compression.Algorithm.NONE.getName());
final Algorithm defaultCompression = HFileWriterImpl
.compressionByName(defaultCompressionStr);
final boolean compactionExclude = conf.getBoolean(
"hbase.mapreduce.hfileoutputformat.compaction.exclude", false);
String defaultCompressionStr = conf.get("hfile.compression", Compression.Algorithm.NONE.getName());
defaultCompression = HFileWriterImpl.compressionByName(defaultCompressionStr);
compactionExclude =
conf.getBoolean("hbase.mapreduce.hfileoutputformat.compaction.exclude", false);
// create a map from column family to the compression algorithm
final Map<byte[], Algorithm> compressionMap = createFamilyCompressionMap(conf);
final Map<byte[], BloomType> bloomTypeMap = createFamilyBloomTypeMap(conf);
final Map<byte[], Integer> blockSizeMap = createFamilyBlockSizeMap(conf);
compressionMap = createFamilyCompressionMap(conf);
bloomTypeMap = createFamilyBloomTypeMap(conf);
blockSizeMap = createFamilyBlockSizeMap(conf);
// Config for data block encoding
String dataBlockEncodingStr = conf.get(DATABLOCK_ENCODING_OVERRIDE_CONF_KEY);
final Map<byte[], DataBlockEncoding> datablockEncodingMap
= createFamilyDataBlockEncodingMap(conf);
final DataBlockEncoding overriddenEncoding;
datablockEncodingMap = createFamilyDataBlockEncodingMap(conf);
if (dataBlockEncodingStr != null) {
overriddenEncoding = DataBlockEncoding.valueOf(dataBlockEncodingStr);
} else {
overriddenEncoding = null;
}
return new RecordWriter<ImmutableBytesWritable, V>() {
// Map of families to writers and how much has been output on the writer.
private final Map<byte [], WriterLength> writers =
new TreeMap<byte [], WriterLength>(Bytes.BYTES_COMPARATOR);
private byte [] previousRow = HConstants.EMPTY_BYTE_ARRAY;
private final byte [] now = Bytes.toBytes(System.currentTimeMillis());
private boolean rollRequested = false;
writers = new TreeMap<byte[], WriterLength>(Bytes.BYTES_COMPARATOR);
previousRow = HConstants.EMPTY_BYTE_ARRAY;
now = Bytes.toBytes(EnvironmentEdgeManager.currentTime());
rollRequested = false;
}
@Override
public void write(ImmutableBytesWritable row, V cell)
throws IOException {
public void write(ImmutableBytesWritable row, V cell) throws IOException {
KeyValue kv = KeyValueUtil.ensureKeyValue(cell);
// null input == user explicitly wants to flush
@ -191,7 +230,7 @@ public class HFileOutputFormat2
// If this is a new column family, verify that the directory exists
if (wl == null) {
fs.mkdirs(new Path(outputdir, Bytes.toString(family)));
fs.mkdirs(new Path(outputDir, Bytes.toString(family)));
}
// If any of the HFiles for the column families has reached
@ -212,28 +251,26 @@ public class HFileOutputFormat2
String tableName = conf.get(OUTPUT_TABLE_NAME_CONF_KEY);
if (tableName != null) {
try (Connection connection = ConnectionFactory.createConnection(conf);
RegionLocator locator =
connection.getRegionLocator(TableName.valueOf(tableName))) {
RegionLocator locator = connection.getRegionLocator(TableName.valueOf(tableName))) {
loc = locator.getRegionLocation(rowKey);
} catch (Throwable e) {
LOG.warn("there's something wrong when locating rowkey: " +
Bytes.toString(rowKey), e);
LOG.warn("there's something wrong when locating rowkey: " + Bytes.toString(rowKey),
e);
loc = null;
}
}
if (null == loc) {
if (LOG.isTraceEnabled()) {
LOG.trace("failed to get region location, so use default writer: " +
Bytes.toString(rowKey));
LOG.trace(
"failed to get region location, so use default writer: " + Bytes.toString(rowKey));
}
wl = getNewWriter(family, conf, null);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("first rowkey: [" + Bytes.toString(rowKey) + "]");
}
InetSocketAddress initialIsa =
new InetSocketAddress(loc.getHostname(), loc.getPort());
InetSocketAddress initialIsa = new InetSocketAddress(loc.getHostname(), loc.getPort());
if (initialIsa.isUnresolved()) {
if (LOG.isTraceEnabled()) {
LOG.trace("failed to resolve bind address: " + loc.getHostname() + ":"
@ -264,8 +301,8 @@ public class HFileOutputFormat2
private void rollWriters() throws IOException {
for (WriterLength wl : this.writers.values()) {
if (wl.writer != null) {
LOG.info("Writer=" + wl.writer.getPath() +
((wl.written == 0)? "": ", wrote=" + wl.written));
LOG.info(
"Writer=" + wl.writer.getPath() + ((wl.written == 0) ? "" : ", wrote=" + wl.written));
close(wl.writer);
}
wl.writer = null;
@ -274,7 +311,8 @@ public class HFileOutputFormat2
this.rollRequested = false;
}
/* Create a new StoreFile.Writer.
/*
* Create a new StoreFile.Writer.
* @param family
* @return A WriterLength, containing a new StoreFile.Writer.
* @throws IOException
@ -284,7 +322,7 @@ public class HFileOutputFormat2
private WriterLength getNewWriter(byte[] family, Configuration conf,
InetSocketAddress[] favoredNodes) throws IOException {
WriterLength wl = new WriterLength();
Path familydir = new Path(outputdir, Bytes.toString(family));
Path familyDir = new Path(outputDir, Bytes.toString(family));
Algorithm compression = compressionMap.get(family);
compression = compression == null ? defaultCompression : compression;
BloomType bloomType = bloomTypeMap.get(family);
@ -296,11 +334,9 @@ public class HFileOutputFormat2
encoding = encoding == null ? DataBlockEncoding.NONE : encoding;
Configuration tempConf = new Configuration(conf);
tempConf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0.0f);
HFileContextBuilder contextBuilder = new HFileContextBuilder()
.withCompression(compression)
HFileContextBuilder contextBuilder = new HFileContextBuilder().withCompression(compression)
.withChecksumType(HStore.getChecksumType(conf))
.withBytesPerCheckSum(HStore.getBytesPerChecksum(conf))
.withBlockSize(blockSize);
.withBytesPerCheckSum(HStore.getBytesPerChecksum(conf)).withBlockSize(blockSize);
if (HFile.getFormatVersion(conf) >= HFile.MIN_FORMAT_VERSION_WITH_TAGS) {
contextBuilder.withIncludesTags(true);
@ -310,14 +346,13 @@ public class HFileOutputFormat2
HFileContext hFileContext = contextBuilder.build();
if (null == favoredNodes) {
wl.writer =
new StoreFileWriter.Builder(conf, new CacheConfig(tempConf), fs)
.withOutputDir(familydir).withBloomType(bloomType)
wl.writer = new StoreFileWriter.Builder(conf, new CacheConfig(tempConf), fs)
.withOutputDir(familyDir).withBloomType(bloomType)
.withComparator(CellComparator.COMPARATOR).withFileContext(hFileContext).build();
} else {
wl.writer =
new StoreFileWriter.Builder(conf, new CacheConfig(tempConf), new HFileSystem(fs))
.withOutputDir(familydir).withBloomType(bloomType)
.withOutputDir(familyDir).withBloomType(bloomType)
.withComparator(CellComparator.COMPARATOR).withFileContext(hFileContext)
.withFavoredNodes(favoredNodes).build();
}
@ -328,12 +363,10 @@ public class HFileOutputFormat2
private void close(final StoreFileWriter w) throws IOException {
if (w != null) {
w.appendFileInfo(StoreFile.BULKLOAD_TIME_KEY,
Bytes.toBytes(System.currentTimeMillis()));
w.appendFileInfo(StoreFile.BULKLOAD_TIME_KEY, Bytes.toBytes(EnvironmentEdgeManager.currentTime()));
w.appendFileInfo(StoreFile.BULKLOAD_TASK_KEY,
Bytes.toBytes(context.getTaskAttemptID().toString()));
w.appendFileInfo(StoreFile.MAJOR_COMPACTION_KEY,
Bytes.toBytes(true));
w.appendFileInfo(StoreFile.MAJOR_COMPACTION_KEY, Bytes.toBytes(true));
w.appendFileInfo(StoreFile.EXCLUDE_FROM_MINOR_COMPACTION_KEY,
Bytes.toBytes(compactionExclude));
w.appendTrackedTimestampsToMetadata();
@ -342,13 +375,11 @@ public class HFileOutputFormat2
}
@Override
public void close(TaskAttemptContext c)
throws IOException, InterruptedException {
public void close(TaskAttemptContext c) throws IOException, InterruptedException {
for (WriterLength wl : this.writers.values()) {
close(wl.writer);
}
}
};
}
/*

102
hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/MultiHFileOutputFormat.java Normal file
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@ -0,0 +1,102 @@
/**
* 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.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.hbase.mapreduce.HFileOutputFormat2;
import com.google.common.annotations.VisibleForTesting;
/**
* Create 3 level tree directory, first level is using table name as parent directory and then use
* family name as child directory, and all related HFiles for one family are under child directory
* -tableName1
* -columnFamilyName1
* -columnFamilyName2
* -HFiles
* -tableName2
* -columnFamilyName1
* -HFiles
* -columnFamilyName2
* <p>
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
@VisibleForTesting
public class MultiHFileOutputFormat extends FileOutputFormat<ImmutableBytesWritable, Cell> {
private static final Log LOG = LogFactory.getLog(MultiHFileOutputFormat.class);
@Override
public RecordWriter<ImmutableBytesWritable, Cell>
getRecordWriter(final TaskAttemptContext context) throws IOException, InterruptedException {
return createMultiHFileRecordWriter(context);
}
static <V extends Cell> RecordWriter<ImmutableBytesWritable, V>
createMultiHFileRecordWriter(final TaskAttemptContext context) throws IOException {
// Get the path of the output directory
final Path outputPath = FileOutputFormat.getOutputPath(context);
final Path outputDir = new FileOutputCommitter(outputPath, context).getWorkPath();
final Configuration conf = context.getConfiguration();
final FileSystem fs = outputDir.getFileSystem(conf);
// Map of tables to writers
final Map<ImmutableBytesWritable, RecordWriter<ImmutableBytesWritable, V>> tableWriters =
new HashMap<ImmutableBytesWritable, RecordWriter<ImmutableBytesWritable, V>>();
return new RecordWriter<ImmutableBytesWritable, V>() {
@Override
public void write(ImmutableBytesWritable tableName, V cell)
throws IOException, InterruptedException {
RecordWriter<ImmutableBytesWritable, V> tableWriter = tableWriters.get(tableName);
// if there is new table, verify that table directory exists
if (tableWriter == null) {
// using table name as directory name
final Path tableOutputDir = new Path(outputDir, Bytes.toString(tableName.copyBytes()));
fs.mkdirs(tableOutputDir);
LOG.info("Writing Table '" + tableName.toString() + "' data into following directory"
+ tableOutputDir.toString());
// Create writer for one specific table
tableWriter = new HFileOutputFormat2.HFileRecordWriter<V>(context, tableOutputDir);
// Put table into map
tableWriters.put(tableName, tableWriter);
}
// Write <Row, Cell> into tableWriter
// in the original code, it does not use Row
tableWriter.write(null, cell);
}
@Override
public void close(TaskAttemptContext c) throws IOException, InterruptedException {
for (RecordWriter<ImmutableBytesWritable, V> writer : tableWriters.values()) {
writer.close(c);
}
}
};
}
}

224
hbase-server/src/test/java/org/apache/hadoop/hbase/mapreduce/TestMultiHFileOutputFormat.java Normal file
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@ -0,0 +1,224 @@
/**
* 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.assertTrue;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;
import java.util.TreeSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.io.hfile.HFile;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.FileOutputCommitter;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Test for{@link MultiHFileOutputFormat}. Sets up and runs a mapreduce job that output directories and
* writes hfiles.
*/
@Category(MediumTests.class)
public class TestMultiHFileOutputFormat {
private static final Log LOG = LogFactory.getLog(TestMultiHFileOutputFormat.class);
private HBaseTestingUtility util = new HBaseTestingUtility();
private static int ROWSPERSPLIT = 10;
private static final int KEYLEN_DEFAULT = 10;
private static final String KEYLEN_CONF = "randomkv.key.length";
private static final int VALLEN_DEFAULT = 10;
private static final String VALLEN_CONF = "randomkv.val.length";
private static final byte[][] TABLES =
{ Bytes.add(Bytes.toBytes(PerformanceEvaluation.TABLE_NAME), Bytes.toBytes("-1")),
Bytes.add(Bytes.toBytes(PerformanceEvaluation.TABLE_NAME), Bytes.toBytes("-2")) };
private static final byte[][] FAMILIES =
{ Bytes.add(PerformanceEvaluation.FAMILY_NAME, Bytes.toBytes("-A")),
Bytes.add(PerformanceEvaluation.FAMILY_NAME, Bytes.toBytes("-B")) };
private static final byte[] QUALIFIER = Bytes.toBytes("data");
public static void main(String[] args) throws Exception {
new TestMultiHFileOutputFormat().testWritingDataIntoHFiles();
}
/**
* Run small MR job. this MR job will write HFile into
* testWritingDataIntoHFiles/tableNames/columFamilies/
*/
@Test
public void testWritingDataIntoHFiles() throws Exception {
Configuration conf = util.getConfiguration();
util.startMiniCluster();
Path testDir = util.getDataTestDirOnTestFS("testWritingDataIntoHFiles");
FileSystem fs = testDir.getFileSystem(conf);
LOG.info("testWritingDataIntoHFiles dir writing to dir: " + testDir);
// Set down this value or we OOME in eclipse.
conf.setInt("mapreduce.task.io.sort.mb", 20);
// Write a few files by setting max file size.
conf.setLong(HConstants.HREGION_MAX_FILESIZE, 64 * 1024);
try {
Job job = Job.getInstance(conf, "testWritingDataIntoHFiles");
FileOutputFormat.setOutputPath(job, testDir);
job.setInputFormatClass(NMapInputFormat.class);
job.setMapperClass(Random_TableKV_GeneratingMapper.class);
job.setMapOutputKeyClass(ImmutableBytesWritable.class);
job.setMapOutputValueClass(KeyValue.class);
job.setReducerClass(Table_KeyValueSortReducer.class);
job.setOutputFormatClass(MultiHFileOutputFormat.class);
job.getConfiguration().setStrings("io.serializations", conf.get("io.serializations"),
MutationSerialization.class.getName(), ResultSerialization.class.getName(),
KeyValueSerialization.class.getName());
TableMapReduceUtil.addDependencyJars(job);
TableMapReduceUtil.initCredentials(job);
LOG.info("\nStarting test testWritingDataIntoHFiles\n");
assertTrue(job.waitForCompletion(true));
LOG.info("\nWaiting on checking MapReduce output\n");
assertTrue(checkMROutput(fs, testDir, 0));
} finally {
testDir.getFileSystem(conf).delete(testDir, true);
util.shutdownMiniCluster();
}
}
/**
* MR will output a 3 level directory, tableName->ColumnFamilyName->HFile this method to check the
* created directory is correct or not A recursion method, the testDir had better be small size
*/
private boolean checkMROutput(FileSystem fs, Path testDir, int level)
throws FileNotFoundException, IOException {
if (level >= 3) {
return HFile.isHFileFormat(fs, testDir);
}
FileStatus[] fStats = fs.listStatus(testDir);
if (fStats == null || fStats.length <= 0) {
LOG.info("Created directory format is not correct");
return false;
}
for (FileStatus stats : fStats) {
// skip the _SUCCESS file created by MapReduce
if (level == 0 && stats.getPath().getName().endsWith(FileOutputCommitter.SUCCEEDED_FILE_NAME))
continue;
if (level < 2 && !stats.isDirectory()) {
LOG.info("Created directory format is not correct");
return false;
}
boolean flag = checkMROutput(fs, stats.getPath(), level + 1);
if (flag == false) return false;
}
return true;
}
/**
* Simple mapper that makes <TableName, KeyValue> output. With no input data
*/
static class Random_TableKV_GeneratingMapper
extends Mapper<NullWritable, NullWritable, ImmutableBytesWritable, Cell> {
private int keyLength;
private int valLength;
@Override
protected void setup(Context context) throws IOException, InterruptedException {
super.setup(context);
Configuration conf = context.getConfiguration();
keyLength = conf.getInt(KEYLEN_CONF, KEYLEN_DEFAULT);
valLength = conf.getInt(VALLEN_CONF, VALLEN_DEFAULT);
}
@Override
protected void map(NullWritable n1, NullWritable n2,
Mapper<NullWritable, NullWritable, ImmutableBytesWritable, Cell>.Context context)
throws java.io.IOException, InterruptedException {
byte keyBytes[] = new byte[keyLength];
byte valBytes[] = new byte[valLength];
ArrayList<ImmutableBytesWritable> tables = new ArrayList<ImmutableBytesWritable>();
for (int i = 0; i < TABLES.length; i++) {
tables.add(new ImmutableBytesWritable(TABLES[i]));
}
int taskId = context.getTaskAttemptID().getTaskID().getId();
assert taskId < Byte.MAX_VALUE : "Unit tests dont support > 127 tasks!";
Random random = new Random();
for (int i = 0; i < ROWSPERSPLIT; i++) {
random.nextBytes(keyBytes);
// Ensure that unique tasks generate unique keys
keyBytes[keyLength - 1] = (byte) (taskId & 0xFF);
random.nextBytes(valBytes);
for (ImmutableBytesWritable table : tables) {
for (byte[] family : FAMILIES) {
Cell kv = new KeyValue(keyBytes, family, QUALIFIER, valBytes);
context.write(table, kv);
}
}
}
}
}
/**
* Simple Reducer that have input <TableName, KeyValue>, with KeyValues have no order. and output
* <TableName, KeyValue>, with KeyValues are ordered
*/
static class Table_KeyValueSortReducer
extends Reducer<ImmutableBytesWritable, KeyValue, ImmutableBytesWritable, KeyValue> {
protected void reduce(ImmutableBytesWritable table, java.lang.Iterable<KeyValue> kvs,
org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable, KeyValue, ImmutableBytesWritable, KeyValue>.Context context)
throws java.io.IOException, InterruptedException {
TreeSet<KeyValue> map = new TreeSet<KeyValue>(KeyValue.COMPARATOR);
for (KeyValue kv : kvs) {
try {
map.add(kv.clone());
} catch (CloneNotSupportedException e) {
throw new java.io.IOException(e);
}
}
context.setStatus("Read " + map.getClass());
int index = 0;
for (KeyValue kv : map) {
context.write(table, kv);
if (++index % 100 == 0) context.setStatus("Wrote " + index);
}
}
}
}