org.apache.hadoop.hive.ql.lockmgr.zookeeper.CuratorFrameworkSingleton Maven / Gradle / Ivy
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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.hive.ql.lockmgr.zookeeper;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.util.ZooKeeperHiveHelper;
public class CuratorFrameworkSingleton {
private static HiveConf conf = null;
private static CuratorFramework sharedClient = null;
static final Log LOG = LogFactory.getLog("CuratorFrameworkSingleton");
static {
// Add shutdown hook.
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
closeAndReleaseInstance();
}
});
}
public static synchronized CuratorFramework getInstance(HiveConf hiveConf) {
if (sharedClient == null) {
// Create a client instance
if (hiveConf == null) {
conf = new HiveConf();
} else {
conf = hiveConf;
}
int sessionTimeout = (int) conf.getTimeVar(HiveConf.ConfVars.HIVE_ZOOKEEPER_SESSION_TIMEOUT, TimeUnit.MILLISECONDS);
int baseSleepTime = (int) conf.getTimeVar(HiveConf.ConfVars.HIVE_ZOOKEEPER_CONNECTION_BASESLEEPTIME, TimeUnit.MILLISECONDS);
int maxRetries = conf.getIntVar(HiveConf.ConfVars.HIVE_ZOOKEEPER_CONNECTION_MAX_RETRIES);
String quorumServers = ZooKeeperHiveHelper.getQuorumServers(conf);
sharedClient = CuratorFrameworkFactory.builder().connectString(quorumServers)
.sessionTimeoutMs(sessionTimeout)
.retryPolicy(new ExponentialBackoffRetry(baseSleepTime, maxRetries))
.build();
sharedClient.start();
}
return sharedClient;
}
public static synchronized void closeAndReleaseInstance() {
if (sharedClient != null) {
sharedClient.close();
sharedClient = null;
String shutdownMsg = "Closing ZooKeeper client.";
LOG.info(shutdownMsg);
}
}
}