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/**
*
* 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.util;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.RegionInfoBuilder;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility methods for interacting with the regions.
*/
@InterfaceAudience.Private
public abstract class ModifyRegionUtils {
private static final Logger LOG = LoggerFactory.getLogger(ModifyRegionUtils.class);
private ModifyRegionUtils() {
}
public interface RegionFillTask {
void fillRegion(final HRegion region) throws IOException;
}
public interface RegionEditTask {
void editRegion(final RegionInfo region) throws IOException;
}
public static RegionInfo[] createRegionInfos(TableDescriptor tableDescriptor,
byte[][] splitKeys) {
long regionId = System.currentTimeMillis();
RegionInfo[] hRegionInfos = null;
if (splitKeys == null || splitKeys.length == 0) {
hRegionInfos = new RegionInfo[]{
RegionInfoBuilder.newBuilder(tableDescriptor.getTableName())
.setStartKey(null)
.setEndKey(null)
.setSplit(false)
.setRegionId(regionId)
.build()
};
} else {
int numRegions = splitKeys.length + 1;
hRegionInfos = new RegionInfo[numRegions];
byte[] startKey = null;
byte[] endKey = null;
for (int i = 0; i < numRegions; i++) {
endKey = (i == splitKeys.length) ? null : splitKeys[i];
hRegionInfos[i] =
RegionInfoBuilder.newBuilder(tableDescriptor.getTableName())
.setStartKey(startKey)
.setEndKey(endKey)
.setSplit(false)
.setRegionId(regionId)
.build();
startKey = endKey;
}
}
return hRegionInfos;
}
/**
* Create new set of regions on the specified file-system.
* NOTE: that you should add the regions to hbase:meta after this operation.
*
* @param conf {@link Configuration}
* @param rootDir Root directory for HBase instance
* @param tableDescriptor description of the table
* @param newRegions {@link RegionInfo} that describes the regions to create
* @param task {@link RegionFillTask} custom code to populate region after creation
* @throws IOException
*/
public static List createRegions(final Configuration conf, final Path rootDir,
final TableDescriptor tableDescriptor, final RegionInfo[] newRegions,
final RegionFillTask task) throws IOException {
if (newRegions == null) return null;
int regionNumber = newRegions.length;
ThreadPoolExecutor exec = getRegionOpenAndInitThreadPool(conf,
"RegionOpenAndInitThread-" + tableDescriptor.getTableName(), regionNumber);
try {
return createRegions(exec, conf, rootDir, tableDescriptor, newRegions, task);
} finally {
exec.shutdownNow();
}
}
/**
* Create new set of regions on the specified file-system.
* NOTE: that you should add the regions to hbase:meta after this operation.
*
* @param exec Thread Pool Executor
* @param conf {@link Configuration}
* @param rootDir Root directory for HBase instance
* @param tableDescriptor description of the table
* @param newRegions {@link RegionInfo} that describes the regions to create
* @param task {@link RegionFillTask} custom code to populate region after creation
* @throws IOException
*/
public static List createRegions(final ThreadPoolExecutor exec,
final Configuration conf, final Path rootDir,
final TableDescriptor tableDescriptor, final RegionInfo[] newRegions,
final RegionFillTask task) throws IOException {
if (newRegions == null) return null;
int regionNumber = newRegions.length;
CompletionService completionService = new ExecutorCompletionService<>(exec);
List regionInfos = new ArrayList<>();
for (final RegionInfo newRegion : newRegions) {
completionService.submit(new Callable() {
@Override
public RegionInfo call() throws IOException {
return createRegion(conf, rootDir, tableDescriptor, newRegion, task);
}
});
}
try {
// wait for all regions to finish creation
for (int i = 0; i < regionNumber; i++) {
regionInfos.add(completionService.take().get());
}
} catch (InterruptedException e) {
LOG.error("Caught " + e + " during region creation");
throw new InterruptedIOException(e.getMessage());
} catch (ExecutionException e) {
throw new IOException(e);
}
return regionInfos;
}
/**
* Create new set of regions on the specified file-system.
* @param conf {@link Configuration}
* @param rootDir Root directory for HBase instance
* @param tableDescriptor description of the table
* @param newRegion {@link RegionInfo} that describes the region to create
* @param task {@link RegionFillTask} custom code to populate region after creation
* @throws IOException
*/
public static RegionInfo createRegion(final Configuration conf, final Path rootDir,
final TableDescriptor tableDescriptor, final RegionInfo newRegion,
final RegionFillTask task) throws IOException {
// 1. Create HRegion
// The WAL subsystem will use the default rootDir rather than the passed in rootDir
// unless I pass along via the conf.
Configuration confForWAL = new Configuration(conf);
confForWAL.set(HConstants.HBASE_DIR, rootDir.toString());
HRegion region = HRegion.createHRegion(newRegion, rootDir, conf, tableDescriptor, null, false);
try {
// 2. Custom user code to interact with the created region
if (task != null) {
task.fillRegion(region);
}
} finally {
// 3. Close the new region to flush to disk. Close log file too.
region.close();
}
return region.getRegionInfo();
}
/**
* Execute the task on the specified set of regions.
*
* @param exec Thread Pool Executor
* @param regions {@link RegionInfo} that describes the regions to edit
* @param task {@link RegionFillTask} custom code to edit the region
* @throws IOException
*/
public static void editRegions(final ThreadPoolExecutor exec,
final Collection regions, final RegionEditTask task) throws IOException {
final ExecutorCompletionService completionService = new ExecutorCompletionService<>(exec);
for (final RegionInfo hri: regions) {
completionService.submit(new Callable() {
@Override
public Void call() throws IOException {
task.editRegion(hri);
return null;
}
});
}
try {
for (RegionInfo hri: regions) {
completionService.take().get();
}
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
} catch (ExecutionException e) {
IOException ex = new IOException();
ex.initCause(e.getCause());
throw ex;
}
}
/*
* used by createRegions() to get the thread pool executor based on the
* "hbase.hregion.open.and.init.threads.max" property.
*/
static ThreadPoolExecutor getRegionOpenAndInitThreadPool(final Configuration conf,
final String threadNamePrefix, int regionNumber) {
int maxThreads = Math.min(regionNumber, conf.getInt(
"hbase.hregion.open.and.init.threads.max", 16));
ThreadPoolExecutor regionOpenAndInitThreadPool = Threads
.getBoundedCachedThreadPool(maxThreads, 30L, TimeUnit.SECONDS,
new ThreadFactory() {
private int count = 1;
@Override
public Thread newThread(Runnable r) {
return new Thread(r, threadNamePrefix + "-" + count++);
}
});
return regionOpenAndInitThreadPool;
}
}