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Main functionality for HBase
/**
* 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.regionserver;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.LineReader;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HDFSBlocksDistribution;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.HRegionFileSystem;
import org.apache.hadoop.hbase.regionserver.compactions.CompactionContext;
import org.apache.hadoop.hbase.regionserver.throttle.NoLimitThroughputController;
import org.apache.hadoop.hbase.mapreduce.JobUtil;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.FSTableDescriptors;
import org.apache.hadoop.hbase.util.FSUtils;
/*
* The CompactionTool allows to execute a compaction specifying a:
*
* - table folder (all regions and families will be compacted)
*
- region folder (all families in the region will be compacted)
*
- family folder (the store files will be compacted)
*
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.TOOLS)
public class CompactionTool extends Configured implements Tool {
private static final Log LOG = LogFactory.getLog(CompactionTool.class);
private final static String CONF_TMP_DIR = "hbase.tmp.dir";
private final static String CONF_COMPACT_ONCE = "hbase.compactiontool.compact.once";
private final static String CONF_COMPACT_MAJOR = "hbase.compactiontool.compact.major";
private final static String CONF_DELETE_COMPACTED = "hbase.compactiontool.delete";
private final static String CONF_COMPLETE_COMPACTION = "hbase.hstore.compaction.complete";
/**
* Class responsible to execute the Compaction on the specified path.
* The path can be a table, region or family directory.
*/
private static class CompactionWorker {
private final boolean keepCompactedFiles;
private final boolean deleteCompacted;
private final Configuration conf;
private final FileSystem fs;
private final Path tmpDir;
public CompactionWorker(final FileSystem fs, final Configuration conf) {
this.conf = conf;
this.keepCompactedFiles = !conf.getBoolean(CONF_COMPLETE_COMPACTION, true);
this.deleteCompacted = conf.getBoolean(CONF_DELETE_COMPACTED, false);
this.tmpDir = new Path(conf.get(CONF_TMP_DIR));
this.fs = fs;
}
/**
* Execute the compaction on the specified path.
*
* @param path Directory path on which to run compaction.
* @param compactOnce Execute just a single step of compaction.
* @param major Request major compaction.
*/
public void compact(final Path path, final boolean compactOnce, final boolean major) throws IOException {
if (isFamilyDir(fs, path)) {
Path regionDir = path.getParent();
Path tableDir = regionDir.getParent();
HTableDescriptor htd = FSTableDescriptors.getTableDescriptorFromFs(fs, tableDir);
HRegionInfo hri = HRegionFileSystem.loadRegionInfoFileContent(fs, regionDir);
compactStoreFiles(tableDir, htd, hri, path.getName(), compactOnce, major);
} else if (isRegionDir(fs, path)) {
Path tableDir = path.getParent();
HTableDescriptor htd = FSTableDescriptors.getTableDescriptorFromFs(fs, tableDir);
compactRegion(tableDir, htd, path, compactOnce, major);
} else if (isTableDir(fs, path)) {
compactTable(path, compactOnce, major);
} else {
throw new IOException(
"Specified path is not a table, region or family directory. path=" + path);
}
}
private void compactTable(final Path tableDir, final boolean compactOnce, final boolean major)
throws IOException {
HTableDescriptor htd = FSTableDescriptors.getTableDescriptorFromFs(fs, tableDir);
for (Path regionDir: FSUtils.getRegionDirs(fs, tableDir)) {
compactRegion(tableDir, htd, regionDir, compactOnce, major);
}
}
private void compactRegion(final Path tableDir, final HTableDescriptor htd,
final Path regionDir, final boolean compactOnce, final boolean major)
throws IOException {
HRegionInfo hri = HRegionFileSystem.loadRegionInfoFileContent(fs, regionDir);
for (Path familyDir: FSUtils.getFamilyDirs(fs, regionDir)) {
compactStoreFiles(tableDir, htd, hri, familyDir.getName(), compactOnce, major);
}
}
/**
* Execute the actual compaction job.
* If the compact once flag is not specified, execute the compaction until
* no more compactions are needed. Uses the Configuration settings provided.
*/
private void compactStoreFiles(final Path tableDir, final HTableDescriptor htd,
final HRegionInfo hri, final String familyName, final boolean compactOnce,
final boolean major) throws IOException {
HStore store = getStore(conf, fs, tableDir, htd, hri, familyName, tmpDir);
LOG.info("Compact table=" + htd.getTableName() +
" region=" + hri.getRegionNameAsString() +
" family=" + familyName);
if (major) {
store.triggerMajorCompaction();
}
do {
CompactionContext compaction = store.requestCompaction(Store.PRIORITY_USER, null);
if (compaction == null) break;
List storeFiles =
store.compact(compaction, NoLimitThroughputController.INSTANCE);
if (storeFiles != null && !storeFiles.isEmpty()) {
if (keepCompactedFiles && deleteCompacted) {
for (StoreFile storeFile: storeFiles) {
fs.delete(storeFile.getPath(), false);
}
}
}
} while (store.needsCompaction() && !compactOnce);
}
/**
* Create a "mock" HStore that uses the tmpDir specified by the user and
* the store dir to compact as source.
*/
private static HStore getStore(final Configuration conf, final FileSystem fs,
final Path tableDir, final HTableDescriptor htd, final HRegionInfo hri,
final String familyName, final Path tempDir) throws IOException {
HRegionFileSystem regionFs = new HRegionFileSystem(conf, fs, tableDir, hri) {
@Override
public Path getTempDir() {
return tempDir;
}
};
HRegion region = new HRegion(regionFs, null, conf, htd, null);
return new HStore(region, htd.getFamily(Bytes.toBytes(familyName)), conf);
}
}
private static boolean isRegionDir(final FileSystem fs, final Path path) throws IOException {
Path regionInfo = new Path(path, HRegionFileSystem.REGION_INFO_FILE);
return fs.exists(regionInfo);
}
private static boolean isTableDir(final FileSystem fs, final Path path) throws IOException {
return FSTableDescriptors.getTableInfoPath(fs, path) != null;
}
private static boolean isFamilyDir(final FileSystem fs, final Path path) throws IOException {
return isRegionDir(fs, path.getParent());
}
private static class CompactionMapper
extends Mapper {
private CompactionWorker compactor = null;
private boolean compactOnce = false;
private boolean major = false;
@Override
public void setup(Context context) {
Configuration conf = context.getConfiguration();
compactOnce = conf.getBoolean(CONF_COMPACT_ONCE, false);
major = conf.getBoolean(CONF_COMPACT_MAJOR, false);
try {
FileSystem fs = FileSystem.get(conf);
this.compactor = new CompactionWorker(fs, conf);
} catch (IOException e) {
throw new RuntimeException("Could not get the input FileSystem", e);
}
}
@Override
public void map(LongWritable key, Text value, Context context)
throws InterruptedException, IOException {
Path path = new Path(value.toString());
this.compactor.compact(path, compactOnce, major);
}
}
/**
* Input format that uses store files block location as input split locality.
*/
private static class CompactionInputFormat extends TextInputFormat {
@Override
protected boolean isSplitable(JobContext context, Path file) {
return true;
}
/**
* Returns a split for each store files directory using the block location
* of each file as locality reference.
*/
@Override
public List getSplits(JobContext job) throws IOException {
List splits = new ArrayList();
List files = listStatus(job);
Text key = new Text();
for (FileStatus file: files) {
Path path = file.getPath();
FileSystem fs = path.getFileSystem(job.getConfiguration());
LineReader reader = new LineReader(fs.open(path));
long pos = 0;
int n;
try {
while ((n = reader.readLine(key)) > 0) {
String[] hosts = getStoreDirHosts(fs, path);
splits.add(new FileSplit(path, pos, n, hosts));
pos += n;
}
} finally {
reader.close();
}
}
return splits;
}
/**
* return the top hosts of the store files, used by the Split
*/
private static String[] getStoreDirHosts(final FileSystem fs, final Path path)
throws IOException {
FileStatus[] files = FSUtils.listStatus(fs, path);
if (files == null) {
return new String[] {};
}
HDFSBlocksDistribution hdfsBlocksDistribution = new HDFSBlocksDistribution();
for (FileStatus hfileStatus: files) {
HDFSBlocksDistribution storeFileBlocksDistribution =
FSUtils.computeHDFSBlocksDistribution(fs, hfileStatus, 0, hfileStatus.getLen());
hdfsBlocksDistribution.add(storeFileBlocksDistribution);
}
List hosts = hdfsBlocksDistribution.getTopHosts();
return hosts.toArray(new String[hosts.size()]);
}
/**
* Create the input file for the given directories to compact.
* The file is a TextFile with each line corrisponding to a
* store files directory to compact.
*/
public static void createInputFile(final FileSystem fs, final Path path,
final Set toCompactDirs) throws IOException {
// Extract the list of store dirs
List storeDirs = new LinkedList();
for (Path compactDir: toCompactDirs) {
if (isFamilyDir(fs, compactDir)) {
storeDirs.add(compactDir);
} else if (isRegionDir(fs, compactDir)) {
for (Path familyDir: FSUtils.getFamilyDirs(fs, compactDir)) {
storeDirs.add(familyDir);
}
} else if (isTableDir(fs, compactDir)) {
// Lookup regions
for (Path regionDir: FSUtils.getRegionDirs(fs, compactDir)) {
for (Path familyDir: FSUtils.getFamilyDirs(fs, regionDir)) {
storeDirs.add(familyDir);
}
}
} else {
throw new IOException(
"Specified path is not a table, region or family directory. path=" + compactDir);
}
}
// Write Input File
FSDataOutputStream stream = fs.create(path);
LOG.info("Create input file=" + path + " with " + storeDirs.size() + " dirs to compact.");
try {
final byte[] newLine = Bytes.toBytes("\n");
for (Path storeDir: storeDirs) {
stream.write(Bytes.toBytes(storeDir.toString()));
stream.write(newLine);
}
} finally {
stream.close();
}
}
}
/**
* Execute compaction, using a Map-Reduce job.
*/
private int doMapReduce(final FileSystem fs, final Set toCompactDirs,
final boolean compactOnce, final boolean major) throws Exception {
Configuration conf = getConf();
conf.setBoolean(CONF_COMPACT_ONCE, compactOnce);
conf.setBoolean(CONF_COMPACT_MAJOR, major);
Job job = new Job(conf);
job.setJobName("CompactionTool");
job.setJarByClass(CompactionTool.class);
job.setMapperClass(CompactionMapper.class);
job.setInputFormatClass(CompactionInputFormat.class);
job.setOutputFormatClass(NullOutputFormat.class);
job.setMapSpeculativeExecution(false);
job.setNumReduceTasks(0);
// add dependencies (including HBase ones)
TableMapReduceUtil.addDependencyJars(job);
Path stagingDir = JobUtil.getStagingDir(conf);
try {
// Create input file with the store dirs
Path inputPath = new Path(stagingDir, "compact-"+ EnvironmentEdgeManager.currentTime());
CompactionInputFormat.createInputFile(fs, inputPath, toCompactDirs);
CompactionInputFormat.addInputPath(job, inputPath);
// Initialize credential for secure cluster
TableMapReduceUtil.initCredentials(job);
// Start the MR Job and wait
return job.waitForCompletion(true) ? 0 : 1;
} finally {
fs.delete(stagingDir, true);
}
}
/**
* Execute compaction, from this client, one path at the time.
*/
private int doClient(final FileSystem fs, final Set toCompactDirs,
final boolean compactOnce, final boolean major) throws IOException {
CompactionWorker worker = new CompactionWorker(fs, getConf());
for (Path path: toCompactDirs) {
worker.compact(path, compactOnce, major);
}
return 0;
}
@Override
public int run(String[] args) throws Exception {
Set toCompactDirs = new HashSet();
boolean compactOnce = false;
boolean major = false;
boolean mapred = false;
Configuration conf = getConf();
FileSystem fs = FileSystem.get(conf);
try {
for (int i = 0; i < args.length; ++i) {
String opt = args[i];
if (opt.equals("-compactOnce")) {
compactOnce = true;
} else if (opt.equals("-major")) {
major = true;
} else if (opt.equals("-mapred")) {
mapred = true;
} else if (!opt.startsWith("-")) {
Path path = new Path(opt);
FileStatus status = fs.getFileStatus(path);
if (!status.isDirectory()) {
printUsage("Specified path is not a directory. path=" + path);
return 1;
}
toCompactDirs.add(path);
} else {
printUsage();
}
}
} catch (Exception e) {
printUsage(e.getMessage());
return 1;
}
if (toCompactDirs.size() == 0) {
printUsage("No directories to compact specified.");
return 1;
}
// Execute compaction!
if (mapred) {
return doMapReduce(fs, toCompactDirs, compactOnce, major);
} else {
return doClient(fs, toCompactDirs, compactOnce, major);
}
}
private void printUsage() {
printUsage(null);
}
private void printUsage(final String message) {
if (message != null && message.length() > 0) {
System.err.println(message);
}
System.err.println("Usage: java " + this.getClass().getName() + " \\");
System.err.println(" [-compactOnce] [-major] [-mapred] [-D]* files...");
System.err.println();
System.err.println("Options:");
System.err.println(" mapred Use MapReduce to run compaction.");
System.err.println(" compactOnce Execute just one compaction step. (default: while needed)");
System.err.println(" major Trigger major compaction.");
System.err.println();
System.err.println("Note: -D properties will be applied to the conf used. ");
System.err.println("For example: ");
System.err.println(" To preserve input files, pass -D"+CONF_COMPLETE_COMPACTION+"=false");
System.err.println(" To stop delete of compacted file, pass -D"+CONF_DELETE_COMPACTED+"=false");
System.err.println(" To set tmp dir, pass -D"+CONF_TMP_DIR+"=ALTERNATE_DIR");
System.err.println();
System.err.println("Examples:");
System.err.println(" To compact the full 'TestTable' using MapReduce:");
System.err.println(" $ bin/hbase " + this.getClass().getName() + " -mapred hdfs:///hbase/data/default/TestTable");
System.err.println();
System.err.println(" To compact column family 'x' of the table 'TestTable' region 'abc':");
System.err.println(" $ bin/hbase " + this.getClass().getName() + " hdfs:///hbase/data/default/TestTable/abc/x");
}
public static void main(String[] args) throws Exception {
System.exit(ToolRunner.run(HBaseConfiguration.create(), new CompactionTool(), args));
}
}