org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hbase-server Show documentation
Show all versions of hbase-server Show documentation
Server 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.mapreduce;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import com.google.protobuf.InvalidProtocolBufferException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.security.token.TokenUtil;
import org.apache.hadoop.hbase.util.Base64;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZKConfig;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.hbase.util.RegionSplitter;
/**
* Utility for {@link TableMapper} and {@link TableReducer}
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@InterfaceAudience.Public
@InterfaceStability.Stable
public class TableMapReduceUtil {
private static final Log LOG = LogFactory.getLog(TableMapReduceUtil.class);
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table The table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(String table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job)
throws IOException {
initTableMapperJob(table, scan, mapper, outputKeyClass, outputValueClass,
job, true);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table The table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(TableName table,
Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass,
Job job) throws IOException {
initTableMapperJob(table.getNameAsString(),
scan,
mapper,
outputKeyClass,
outputValueClass,
job,
true);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table Binary representation of the table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(byte[] table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job)
throws IOException {
initTableMapperJob(Bytes.toString(table), scan, mapper, outputKeyClass, outputValueClass,
job, true);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table The table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(String table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars, Class inputFormatClass)
throws IOException {
initTableMapperJob(table, scan, mapper, outputKeyClass, outputValueClass, job,
addDependencyJars, true, inputFormatClass);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table The table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @param initCredentials whether to initialize hbase auth credentials for the job
* @param inputFormatClass the input format
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(String table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars, boolean initCredentials,
Class inputFormatClass)
throws IOException {
job.setInputFormatClass(inputFormatClass);
if (outputValueClass != null) job.setMapOutputValueClass(outputValueClass);
if (outputKeyClass != null) job.setMapOutputKeyClass(outputKeyClass);
job.setMapperClass(mapper);
if (Put.class.equals(outputValueClass)) {
job.setCombinerClass(PutCombiner.class);
}
Configuration conf = job.getConfiguration();
HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
conf.set(TableInputFormat.INPUT_TABLE, table);
conf.set(TableInputFormat.SCAN, convertScanToString(scan));
conf.setStrings("io.serializations", conf.get("io.serializations"),
MutationSerialization.class.getName(), ResultSerialization.class.getName(),
KeyValueSerialization.class.getName());
if (addDependencyJars) {
addDependencyJars(job);
}
if (initCredentials) {
initCredentials(job);
}
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table Binary representation of the table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @param inputFormatClass The class of the input format
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(byte[] table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars, Class inputFormatClass)
throws IOException {
initTableMapperJob(Bytes.toString(table), scan, mapper, outputKeyClass,
outputValueClass, job, addDependencyJars, inputFormatClass);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table Binary representation of the table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(byte[] table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars)
throws IOException {
initTableMapperJob(Bytes.toString(table), scan, mapper, outputKeyClass,
outputValueClass, job, addDependencyJars, TableInputFormat.class);
}
/**
* Use this before submitting a TableMap job. It will appropriately set up
* the job.
*
* @param table The table name to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(String table, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars)
throws IOException {
initTableMapperJob(table, scan, mapper, outputKeyClass,
outputValueClass, job, addDependencyJars, TableInputFormat.class);
}
/**
* Enable a basic on-heap cache for these jobs. Any BlockCache implementation based on
* direct memory will likely cause the map tasks to OOM when opening the region. This
* is done here instead of in TableSnapshotRegionRecordReader in case an advanced user
* wants to override this behavior in their job.
*/
public static void resetCacheConfig(Configuration conf) {
conf.setFloat(
HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
conf.setFloat(HConstants.BUCKET_CACHE_SIZE_KEY, 0f);
conf.unset(HConstants.BUCKET_CACHE_IOENGINE_KEY);
}
/**
* Sets up the job for reading from one or more table snapshots, with one or more scans
* per snapshot.
* It bypasses hbase servers and read directly from snapshot files.
*
* @param snapshotScans map of snapshot name to scans on that snapshot.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
*/
public static void initMultiTableSnapshotMapperJob(Map> snapshotScans,
Class mapper, Class outputKeyClass, Class outputValueClass,
Job job, boolean addDependencyJars, Path tmpRestoreDir) throws IOException {
MultiTableSnapshotInputFormat.setInput(job.getConfiguration(), snapshotScans, tmpRestoreDir);
job.setInputFormatClass(MultiTableSnapshotInputFormat.class);
if (outputValueClass != null) {
job.setMapOutputValueClass(outputValueClass);
}
if (outputKeyClass != null) {
job.setMapOutputKeyClass(outputKeyClass);
}
job.setMapperClass(mapper);
Configuration conf = job.getConfiguration();
HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
if (addDependencyJars) {
addDependencyJars(job);
}
resetCacheConfig(job.getConfiguration());
}
/**
* Sets up the job for reading from a table snapshot. It bypasses hbase servers
* and read directly from snapshot files.
*
* @param snapshotName The name of the snapshot (of a table) to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
*
* @param tmpRestoreDir a temporary directory to copy the snapshot files into. Current user should
* have write permissions to this directory, and this should not be a subdirectory of rootdir.
* After the job is finished, restore directory can be deleted.
* @throws IOException When setting up the details fails.
* @see TableSnapshotInputFormat
*/
public static void initTableSnapshotMapperJob(String snapshotName, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars, Path tmpRestoreDir)
throws IOException {
TableSnapshotInputFormat.setInput(job, snapshotName, tmpRestoreDir);
initTableMapperJob(snapshotName, scan, mapper, outputKeyClass,
outputValueClass, job, addDependencyJars, false, TableSnapshotInputFormat.class);
resetCacheConfig(job.getConfiguration());
}
/**
* Sets up the job for reading from a table snapshot. It bypasses hbase servers
* and read directly from snapshot files.
*
* @param snapshotName The name of the snapshot (of a table) to read from.
* @param scan The scan instance with the columns, time range etc.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
*
* @param tmpRestoreDir a temporary directory to copy the snapshot files into. Current user should
* have write permissions to this directory, and this should not be a subdirectory of rootdir.
* After the job is finished, restore directory can be deleted.
* @param splitAlgo algorithm to split
* @param numSplitsPerRegion how many input splits to generate per one region
* @throws IOException When setting up the details fails.
* @see TableSnapshotInputFormat
*/
public static void initTableSnapshotMapperJob(String snapshotName, Scan scan,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars, Path tmpRestoreDir,
RegionSplitter.SplitAlgorithm splitAlgo,
int numSplitsPerRegion)
throws IOException {
TableSnapshotInputFormat.setInput(job, snapshotName, tmpRestoreDir, splitAlgo,
numSplitsPerRegion);
initTableMapperJob(snapshotName, scan, mapper, outputKeyClass,
outputValueClass, job, addDependencyJars, false, TableSnapshotInputFormat.class);
resetCacheConfig(job.getConfiguration());
}
/**
* Use this before submitting a Multi TableMap job. It will appropriately set
* up the job.
*
* @param scans The list of {@link Scan} objects to read from.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is carrying
* all necessary HBase configuration.
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(List scans,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job) throws IOException {
initTableMapperJob(scans, mapper, outputKeyClass, outputValueClass, job,
true);
}
/**
* Use this before submitting a Multi TableMap job. It will appropriately set
* up the job.
*
* @param scans The list of {@link Scan} objects to read from.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is carrying
* all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the
* configured job classes via the distributed cache (tmpjars).
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(List scans,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars) throws IOException {
initTableMapperJob(scans, mapper, outputKeyClass, outputValueClass, job,
addDependencyJars, true);
}
/**
* Use this before submitting a Multi TableMap job. It will appropriately set
* up the job.
*
* @param scans The list of {@link Scan} objects to read from.
* @param mapper The mapper class to use.
* @param outputKeyClass The class of the output key.
* @param outputValueClass The class of the output value.
* @param job The current job to adjust. Make sure the passed job is carrying
* all necessary HBase configuration.
* @param addDependencyJars upload HBase jars and jars for any of the
* configured job classes via the distributed cache (tmpjars).
* @param initCredentials whether to initialize hbase auth credentials for the job
* @throws IOException When setting up the details fails.
*/
public static void initTableMapperJob(List scans,
Class mapper,
Class outputKeyClass,
Class outputValueClass, Job job,
boolean addDependencyJars,
boolean initCredentials) throws IOException {
job.setInputFormatClass(MultiTableInputFormat.class);
if (outputValueClass != null) {
job.setMapOutputValueClass(outputValueClass);
}
if (outputKeyClass != null) {
job.setMapOutputKeyClass(outputKeyClass);
}
job.setMapperClass(mapper);
Configuration conf = job.getConfiguration();
HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
List scanStrings = new ArrayList();
for (Scan scan : scans) {
scanStrings.add(convertScanToString(scan));
}
job.getConfiguration().setStrings(MultiTableInputFormat.SCANS,
scanStrings.toArray(new String[scanStrings.size()]));
if (addDependencyJars) {
addDependencyJars(job);
}
if (initCredentials) {
initCredentials(job);
}
}
public static void initCredentials(Job job) throws IOException {
UserProvider userProvider = UserProvider.instantiate(job.getConfiguration());
if (userProvider.isHadoopSecurityEnabled()) {
// propagate delegation related props from launcher job to MR job
if (System.getenv("HADOOP_TOKEN_FILE_LOCATION") != null) {
job.getConfiguration().set("mapreduce.job.credentials.binary",
System.getenv("HADOOP_TOKEN_FILE_LOCATION"));
}
}
if (userProvider.isHBaseSecurityEnabled()) {
try {
// init credentials for remote cluster
String quorumAddress = job.getConfiguration().get(TableOutputFormat.QUORUM_ADDRESS);
User user = userProvider.getCurrent();
if (quorumAddress != null) {
Configuration peerConf = HBaseConfiguration.createClusterConf(job.getConfiguration(),
quorumAddress, TableOutputFormat.OUTPUT_CONF_PREFIX);
Connection peerConn = ConnectionFactory.createConnection(peerConf);
try {
TokenUtil.addTokenForJob(peerConn, user, job);
} finally {
peerConn.close();
}
}
Connection conn = ConnectionFactory.createConnection(job.getConfiguration());
try {
TokenUtil.addTokenForJob(conn, user, job);
} finally {
conn.close();
}
} catch (InterruptedException ie) {
LOG.info("Interrupted obtaining user authentication token");
Thread.currentThread().interrupt();
}
}
}
/**
* Obtain an authentication token, for the specified cluster, on behalf of the current user
* and add it to the credentials for the given map reduce job.
*
* The quorumAddress is the key to the ZK ensemble, which contains:
* hbase.zookeeper.quorum, hbase.zookeeper.client.port and
* zookeeper.znode.parent
*
* @param job The job that requires the permission.
* @param quorumAddress string that contains the 3 required configuratins
* @throws IOException When the authentication token cannot be obtained.
* @deprecated Since 1.2.0, use {@link #initCredentialsForCluster(Job, Configuration)} instead.
*/
@Deprecated
public static void initCredentialsForCluster(Job job, String quorumAddress)
throws IOException {
Configuration peerConf = HBaseConfiguration.createClusterConf(job.getConfiguration(),
quorumAddress);
initCredentialsForCluster(job, peerConf);
}
/**
* Obtain an authentication token, for the specified cluster, on behalf of the current user
* and add it to the credentials for the given map reduce job.
*
* @param job The job that requires the permission.
* @param conf The configuration to use in connecting to the peer cluster
* @throws IOException When the authentication token cannot be obtained.
*/
public static void initCredentialsForCluster(Job job, Configuration conf)
throws IOException {
UserProvider userProvider = UserProvider.instantiate(job.getConfiguration());
if (userProvider.isHBaseSecurityEnabled()) {
try {
Connection peerConn = ConnectionFactory.createConnection(conf);
try {
TokenUtil.addTokenForJob(peerConn, userProvider.getCurrent(), job);
} finally {
peerConn.close();
}
} catch (InterruptedException e) {
LOG.info("Interrupted obtaining user authentication token");
Thread.interrupted();
}
}
}
/**
* Writes the given scan into a Base64 encoded string.
*
* @param scan The scan to write out.
* @return The scan saved in a Base64 encoded string.
* @throws IOException When writing the scan fails.
*/
public static String convertScanToString(Scan scan) throws IOException {
ClientProtos.Scan proto = ProtobufUtil.toScan(scan);
return Base64.encodeBytes(proto.toByteArray());
}
/**
* Converts the given Base64 string back into a Scan instance.
*
* @param base64 The scan details.
* @return The newly created Scan instance.
* @throws IOException When reading the scan instance fails.
*/
public static Scan convertStringToScan(String base64) throws IOException {
byte [] decoded = Base64.decode(base64);
ClientProtos.Scan scan;
try {
scan = ClientProtos.Scan.parseFrom(decoded);
} catch (InvalidProtocolBufferException ipbe) {
throw new IOException(ipbe);
}
return ProtobufUtil.toScan(scan);
}
/**
* Use this before submitting a TableReduce job. It will
* appropriately set up the JobConf.
*
* @param table The output table.
* @param reducer The reducer class to use.
* @param job The current job to adjust.
* @throws IOException When determining the region count fails.
*/
public static void initTableReducerJob(String table,
Class reducer, Job job)
throws IOException {
initTableReducerJob(table, reducer, job, null);
}
/**
* Use this before submitting a TableReduce job. It will
* appropriately set up the JobConf.
*
* @param table The output table.
* @param reducer The reducer class to use.
* @param job The current job to adjust.
* @param partitioner Partitioner to use. Pass null to use
* default partitioner.
* @throws IOException When determining the region count fails.
*/
public static void initTableReducerJob(String table,
Class reducer, Job job,
Class partitioner) throws IOException {
initTableReducerJob(table, reducer, job, partitioner, null, null, null);
}
/**
* Use this before submitting a TableReduce job. It will
* appropriately set up the JobConf.
*
* @param table The output table.
* @param reducer The reducer class to use.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param partitioner Partitioner to use. Pass null to use
* default partitioner.
* @param quorumAddress Distant cluster to write to; default is null for
* output to the cluster that is designated in hbase-site.xml.
* Set this String to the zookeeper ensemble of an alternate remote cluster
* when you would have the reduce write a cluster that is other than the
* default; e.g. copying tables between clusters, the source would be
* designated by hbase-site.xml and this param would have the
* ensemble address of the remote cluster. The format to pass is particular.
* Pass <hbase.zookeeper.quorum>:<
* hbase.zookeeper.client.port>:<zookeeper.znode.parent>
* such as server,server2,server3:2181:/hbase.
* @param serverClass redefined hbase.regionserver.class
* @param serverImpl redefined hbase.regionserver.impl
* @throws IOException When determining the region count fails.
*/
public static void initTableReducerJob(String table,
Class reducer, Job job,
Class partitioner, String quorumAddress, String serverClass,
String serverImpl) throws IOException {
initTableReducerJob(table, reducer, job, partitioner, quorumAddress,
serverClass, serverImpl, true);
}
/**
* Use this before submitting a TableReduce job. It will
* appropriately set up the JobConf.
*
* @param table The output table.
* @param reducer The reducer class to use.
* @param job The current job to adjust. Make sure the passed job is
* carrying all necessary HBase configuration.
* @param partitioner Partitioner to use. Pass null to use
* default partitioner.
* @param quorumAddress Distant cluster to write to; default is null for
* output to the cluster that is designated in hbase-site.xml.
* Set this String to the zookeeper ensemble of an alternate remote cluster
* when you would have the reduce write a cluster that is other than the
* default; e.g. copying tables between clusters, the source would be
* designated by hbase-site.xml and this param would have the
* ensemble address of the remote cluster. The format to pass is particular.
* Pass <hbase.zookeeper.quorum>:<
* hbase.zookeeper.client.port>:<zookeeper.znode.parent>
* such as server,server2,server3:2181:/hbase.
* @param serverClass redefined hbase.regionserver.class
* @param serverImpl redefined hbase.regionserver.impl
* @param addDependencyJars upload HBase jars and jars for any of the configured
* job classes via the distributed cache (tmpjars).
* @throws IOException When determining the region count fails.
*/
public static void initTableReducerJob(String table,
Class reducer, Job job,
Class partitioner, String quorumAddress, String serverClass,
String serverImpl, boolean addDependencyJars) throws IOException {
Configuration conf = job.getConfiguration();
HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
job.setOutputFormatClass(TableOutputFormat.class);
if (reducer != null) job.setReducerClass(reducer);
conf.set(TableOutputFormat.OUTPUT_TABLE, table);
conf.setStrings("io.serializations", conf.get("io.serializations"),
MutationSerialization.class.getName(), ResultSerialization.class.getName());
// If passed a quorum/ensemble address, pass it on to TableOutputFormat.
if (quorumAddress != null) {
// Calling this will validate the format
ZKConfig.validateClusterKey(quorumAddress);
conf.set(TableOutputFormat.QUORUM_ADDRESS,quorumAddress);
}
if (serverClass != null && serverImpl != null) {
conf.set(TableOutputFormat.REGION_SERVER_CLASS, serverClass);
conf.set(TableOutputFormat.REGION_SERVER_IMPL, serverImpl);
}
job.setOutputKeyClass(ImmutableBytesWritable.class);
job.setOutputValueClass(Writable.class);
if (partitioner == HRegionPartitioner.class) {
job.setPartitionerClass(HRegionPartitioner.class);
int regions = MetaTableAccessor.getRegionCount(conf, TableName.valueOf(table));
if (job.getNumReduceTasks() > regions) {
job.setNumReduceTasks(regions);
}
} else if (partitioner != null) {
job.setPartitionerClass(partitioner);
}
if (addDependencyJars) {
addDependencyJars(job);
}
initCredentials(job);
}
/**
* Ensures that the given number of reduce tasks for the given job
* configuration does not exceed the number of regions for the given table.
*
* @param table The table to get the region count for.
* @param job The current job to adjust.
* @throws IOException When retrieving the table details fails.
*/
public static void limitNumReduceTasks(String table, Job job)
throws IOException {
int regions =
MetaTableAccessor.getRegionCount(job.getConfiguration(), TableName.valueOf(table));
if (job.getNumReduceTasks() > regions)
job.setNumReduceTasks(regions);
}
/**
* Sets the number of reduce tasks for the given job configuration to the
* number of regions the given table has.
*
* @param table The table to get the region count for.
* @param job The current job to adjust.
* @throws IOException When retrieving the table details fails.
*/
public static void setNumReduceTasks(String table, Job job)
throws IOException {
job.setNumReduceTasks(MetaTableAccessor.getRegionCount(job.getConfiguration(),
TableName.valueOf(table)));
}
/**
* Sets the number of rows to return and cache with each scanner iteration.
* Higher caching values will enable faster mapreduce jobs at the expense of
* requiring more heap to contain the cached rows.
*
* @param job The current job to adjust.
* @param batchSize The number of rows to return in batch with each scanner
* iteration.
*/
public static void setScannerCaching(Job job, int batchSize) {
job.getConfiguration().setInt("hbase.client.scanner.caching", batchSize);
}
/**
* Add HBase and its dependencies (only) to the job configuration.
*
* This is intended as a low-level API, facilitating code reuse between this
* class and its mapred counterpart. It also of use to external tools that
* need to build a MapReduce job that interacts with HBase but want
* fine-grained control over the jars shipped to the cluster.
*
* @param conf The Configuration object to extend with dependencies.
* @see org.apache.hadoop.hbase.mapred.TableMapReduceUtil
* @see PIG-3285
*/
public static void addHBaseDependencyJars(Configuration conf) throws IOException {
// PrefixTreeCodec is part of the hbase-prefix-tree module. If not included in MR jobs jar
// dependencies, MR jobs that write encoded hfiles will fail.
// We used reflection here so to prevent a circular module dependency.
// TODO - if we extract the MR into a module, make it depend on hbase-prefix-tree.
Class prefixTreeCodecClass = null;
try {
prefixTreeCodecClass =
Class.forName("org.apache.hadoop.hbase.codec.prefixtree.PrefixTreeCodec");
} catch (ClassNotFoundException e) {
// this will show up in unit tests but should not show in real deployments
LOG.warn("The hbase-prefix-tree module jar containing PrefixTreeCodec is not present." +
" Continuing without it.");
}
addDependencyJarsForClasses(conf,
// explicitly pull a class from each module
org.apache.hadoop.hbase.HConstants.class, // hbase-common
org.apache.hadoop.hbase.protobuf.generated.ClientProtos.class, // hbase-protocol
org.apache.hadoop.hbase.client.Put.class, // hbase-client
org.apache.hadoop.hbase.CompatibilityFactory.class, // hbase-hadoop-compat
org.apache.hadoop.hbase.mapreduce.TableMapper.class, // hbase-server
org.apache.hbase.thirdparty.com.google.gson.GsonBuilder.class, // hbase-shaded-gson
prefixTreeCodecClass, // hbase-prefix-tree (if null will be skipped)
// pull necessary dependencies
org.apache.zookeeper.ZooKeeper.class,
io.netty.channel.Channel.class,
com.google.protobuf.Message.class,
com.google.common.collect.Lists.class,
org.apache.htrace.Trace.class,
com.yammer.metrics.core.MetricsRegistry.class);
}
/**
* Returns a classpath string built from the content of the "tmpjars" value in {@code conf}.
* Also exposed to shell scripts via `bin/hbase mapredcp`.
*/
public static String buildDependencyClasspath(Configuration conf) {
if (conf == null) {
throw new IllegalArgumentException("Must provide a configuration object.");
}
Set paths = new HashSet(conf.getStringCollection("tmpjars"));
if (paths.size() == 0) {
throw new IllegalArgumentException("Configuration contains no tmpjars.");
}
StringBuilder sb = new StringBuilder();
for (String s : paths) {
// entries can take the form 'file:/path/to/file.jar'.
int idx = s.indexOf(":");
if (idx != -1) s = s.substring(idx + 1);
if (sb.length() > 0) sb.append(File.pathSeparator);
sb.append(s);
}
return sb.toString();
}
/**
* Add the HBase dependency jars as well as jars for any of the configured
* job classes to the job configuration, so that JobClient will ship them
* to the cluster and add them to the DistributedCache.
*/
public static void addDependencyJars(Job job) throws IOException {
addHBaseDependencyJars(job.getConfiguration());
try {
addDependencyJarsForClasses(job.getConfiguration(),
// when making changes here, consider also mapred.TableMapReduceUtil
// pull job classes
job.getMapOutputKeyClass(),
job.getMapOutputValueClass(),
job.getInputFormatClass(),
job.getOutputKeyClass(),
job.getOutputValueClass(),
job.getOutputFormatClass(),
job.getPartitionerClass(),
job.getCombinerClass());
} catch (ClassNotFoundException e) {
throw new IOException(e);
}
}
/**
* Add the jars containing the given classes to the job's configuration
* such that JobClient will ship them to the cluster and add them to
* the DistributedCache.
* @deprecated rely on {@link #addDependencyJars(Job)} instead.
*/
@Deprecated
public static void addDependencyJars(Configuration conf,
Class... classes) throws IOException {
LOG.warn("The addDependencyJars(Configuration, Class...) method has been deprecated since it"
+ " is easy to use incorrectly. Most users should rely on addDependencyJars(Job) " +
"instead. See HBASE-8386 for more details.");
addDependencyJarsForClasses(conf, classes);
}
/**
* Add the jars containing the given classes to the job's configuration
* such that JobClient will ship them to the cluster and add them to
* the DistributedCache.
*
* N.B. that this method at most adds one jar per class given. If there is more than one
* jar available containing a class with the same name as a given class, we don't define
* which of those jars might be chosen.
*
* @param conf The Hadoop Configuration to modify
* @param classes will add just those dependencies needed to find the given classes
* @throws IOException if an underlying library call fails.
*/
@InterfaceAudience.Private
public static void addDependencyJarsForClasses(Configuration conf,
Class... classes) throws IOException {
FileSystem localFs = FileSystem.getLocal(conf);
Set jars = new HashSet();
// Add jars that are already in the tmpjars variable
jars.addAll(conf.getStringCollection("tmpjars"));
// add jars as we find them to a map of contents jar name so that we can avoid
// creating new jars for classes that have already been packaged.
Map packagedClasses = new HashMap();
// Add jars containing the specified classes
for (Class clazz : classes) {
if (clazz == null) continue;
Path path = findOrCreateJar(clazz, localFs, packagedClasses);
if (path == null) {
LOG.warn("Could not find jar for class " + clazz +
" in order to ship it to the cluster.");
continue;
}
if (!localFs.exists(path)) {
LOG.warn("Could not validate jar file " + path + " for class "
+ clazz);
continue;
}
jars.add(path.toString());
}
if (jars.isEmpty()) return;
conf.set("tmpjars", StringUtils.arrayToString(jars.toArray(new String[jars.size()])));
}
/**
* Finds the Jar for a class or creates it if it doesn't exist. If the class is in
* a directory in the classpath, it creates a Jar on the fly with the
* contents of the directory and returns the path to that Jar. If a Jar is
* created, it is created in the system temporary directory. Otherwise,
* returns an existing jar that contains a class of the same name. Maintains
* a mapping from jar contents to the tmp jar created.
* @param my_class the class to find.
* @param fs the FileSystem with which to qualify the returned path.
* @param packagedClasses a map of class name to path.
* @return a jar file that contains the class.
* @throws IOException
*/
private static Path findOrCreateJar(Class my_class, FileSystem fs,
Map packagedClasses)
throws IOException {
// attempt to locate an existing jar for the class.
String jar = findContainingJar(my_class, packagedClasses);
if (null == jar || jar.isEmpty()) {
jar = getJar(my_class);
updateMap(jar, packagedClasses);
}
if (null == jar || jar.isEmpty()) {
return null;
}
LOG.debug(String.format("For class %s, using jar %s", my_class.getName(), jar));
return new Path(jar).makeQualified(fs);
}
/**
* Add entries to packagedClasses corresponding to class files
* contained in jar.
* @param jar The jar who's content to list.
* @param packagedClasses map[class -> jar]
*/
private static void updateMap(String jar, Map packagedClasses) throws IOException {
if (null == jar || jar.isEmpty()) {
return;
}
ZipFile zip = null;
try {
zip = new ZipFile(jar);
for (Enumeration iter = zip.entries(); iter.hasMoreElements();) {
ZipEntry entry = iter.nextElement();
if (entry.getName().endsWith("class")) {
packagedClasses.put(entry.getName(), jar);
}
}
} finally {
if (null != zip) zip.close();
}
}
/**
* Find a jar that contains a class of the same name, if any. It will return
* a jar file, even if that is not the first thing on the class path that
* has a class with the same name. Looks first on the classpath and then in
* the packagedClasses map.
* @param my_class the class to find.
* @return a jar file that contains the class, or null.
* @throws IOException
*/
private static String findContainingJar(Class my_class, Map packagedClasses)
throws IOException {
ClassLoader loader = my_class.getClassLoader();
String class_file = my_class.getName().replaceAll("\\.", "/") + ".class";
if (loader != null) {
// first search the classpath
for (Enumeration itr = loader.getResources(class_file); itr.hasMoreElements();) {
URL url = itr.nextElement();
if ("jar".equals(url.getProtocol())) {
String toReturn = url.getPath();
if (toReturn.startsWith("file:")) {
toReturn = toReturn.substring("file:".length());
}
// URLDecoder is a misnamed class, since it actually decodes
// x-www-form-urlencoded MIME type rather than actual
// URL encoding (which the file path has). Therefore it would
// decode +s to ' 's which is incorrect (spaces are actually
// either unencoded or encoded as "%20"). Replace +s first, so
// that they are kept sacred during the decoding process.
toReturn = toReturn.replaceAll("\\+", "%2B");
toReturn = URLDecoder.decode(toReturn, "UTF-8");
return toReturn.replaceAll("!.*$", "");
}
}
}
// now look in any jars we've packaged using JarFinder. Returns null when
// no jar is found.
return packagedClasses.get(class_file);
}
/**
* Invoke 'getJar' on a custom JarFinder implementation. Useful for some job
* configuration contexts (HBASE-8140) and also for testing on MRv2.
* check if we have HADOOP-9426.
* @param my_class the class to find.
* @return a jar file that contains the class, or null.
*/
private static String getJar(Class my_class) {
String ret = null;
try {
ret = JarFinder.getJar(my_class);
} catch (Exception e) {
// toss all other exceptions, related to reflection failure
throw new RuntimeException("getJar invocation failed.", e);
}
return ret;
}
}