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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.List;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
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.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HConnectionManager;
import org.apache.hadoop.hbase.client.Row;
import org.apache.hadoop.hbase.client.coprocessor.Batch;
/**
* Provides ability to create multiple HConnection instances and allows to process a batch of
* actions using HConnection.processBatchCallback()
*/
@InterfaceAudience.Private
public class MultiHConnection {
private static final Log LOG = LogFactory.getLog(MultiHConnection.class);
private HConnection[] hConnections;
private int noOfConnections;
private ExecutorService batchPool;
/**
* Create multiple HConnection instances and initialize a thread pool executor
* @param conf configuration
* @param noOfConnections total no of HConnections to create
* @throws IOException
*/
public MultiHConnection(Configuration conf, int noOfConnections)
throws IOException {
this.noOfConnections = noOfConnections;
hConnections = new HConnection[noOfConnections];
for (int i = 0; i < noOfConnections; i++) {
HConnection conn = HConnectionManager.createConnection(conf);
hConnections[i] = conn;
}
createBatchPool(conf);
}
/**
* Close the open connections and shutdown the batchpool
*/
public void close() {
if (hConnections != null) {
synchronized (hConnections) {
if (hConnections != null) {
for (HConnection conn : hConnections) {
if (conn != null) {
try {
conn.close();
} catch (IOException e) {
LOG.info("Got exception in closing connection", e);
} finally {
conn = null;
}
}
}
hConnections = null;
}
}
}
if (this.batchPool != null && !this.batchPool.isShutdown()) {
this.batchPool.shutdown();
try {
if (!this.batchPool.awaitTermination(10, TimeUnit.SECONDS)) {
this.batchPool.shutdownNow();
}
} catch (InterruptedException e) {
this.batchPool.shutdownNow();
}
}
}
private static ThreadLocal threadLocalRandom = new ThreadLocal() {
@Override
protected Random initialValue() {
return new Random();
}
};
/**
* Randomly pick a connection and process the batch of actions for a given table
* @param actions the actions
* @param tableName table name
* @param results the results array
* @param callback
* @throws IOException
* @throws InterruptedException
*/
@SuppressWarnings("deprecation")
public void processBatchCallback(List actions, TableName tableName,
Object[] results, Batch.Callback callback) throws IOException {
// Currently used by RegionStateStore
// A deprecated method is used as multiple threads accessing RegionStateStore do a single put
// and htable is not thread safe. Alternative would be to create an Htable instance for each
// put but that is not very efficient.
// See HBASE-11610 for more details.
try {
hConnections[threadLocalRandom.get().nextInt(noOfConnections)].processBatchCallback(
actions, tableName, this.batchPool, results, callback);
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
}
}
// Copied from HConnectionImplementation.getBatchPool()
// We should get rid of this when HConnection.processBatchCallback is un-deprecated and provides
// an API to manage a batch pool
private void createBatchPool(Configuration conf) {
// Use the same config for keep alive as in HConnectionImplementation.getBatchPool();
int maxThreads = conf.getInt("hbase.multihconnection.threads.max", 256);
int coreThreads = conf.getInt("hbase.multihconnection.threads.core", 256);
if (maxThreads == 0) {
maxThreads = Runtime.getRuntime().availableProcessors() * 8;
}
if (coreThreads == 0) {
coreThreads = Runtime.getRuntime().availableProcessors() * 8;
}
long keepAliveTime = conf.getLong("hbase.multihconnection.threads.keepalivetime", 60);
LinkedBlockingQueue workQueue =
new LinkedBlockingQueue(maxThreads
* conf.getInt(HConstants.HBASE_CLIENT_MAX_TOTAL_TASKS,
HConstants.DEFAULT_HBASE_CLIENT_MAX_TOTAL_TASKS));
ThreadPoolExecutor tpe =
new ThreadPoolExecutor(coreThreads, maxThreads, keepAliveTime, TimeUnit.SECONDS, workQueue,
Threads.newDaemonThreadFactory("MultiHConnection" + "-shared-"));
tpe.allowCoreThreadTimeOut(true);
this.batchPool = tpe;
}
}