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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.curator;
import com.yahoo.log.LogLevel;
import org.apache.curator.utils.DefaultZookeeperFactory;
import org.apache.curator.utils.ZookeeperFactory;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import java.net.UnknownHostException;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* A ZooKeeper handle factory that handles unknown host exceptions.
*
* @author lulf
* @since 5.9
*/
class DNSResolvingFixerZooKeeperFactory implements ZookeeperFactory {
public static final long UNKNOWN_HOST_WAIT_TIME_MILLIS = TimeUnit.SECONDS.toMillis(10);
private static final Logger log = Logger.getLogger(DNSResolvingFixerZooKeeperFactory.class.getName());
private final DefaultZookeeperFactory zookeeperFactory;
private final long maxTimeout;
public DNSResolvingFixerZooKeeperFactory(long maxTimeout) {
this.maxTimeout = maxTimeout;
this.zookeeperFactory = new DefaultZookeeperFactory();
}
@Override
public ZooKeeper newZooKeeper(String connectString, int sessionTimeout, Watcher watcher, boolean canBeReadOnly) throws Exception {
long endTime = System.currentTimeMillis() + maxTimeout;
do {
try {
return zookeeperFactory.newZooKeeper(connectString, sessionTimeout, watcher, canBeReadOnly);
} catch (UnknownHostException e) {
log.log(LogLevel.WARNING, "Error creating ZooKeeper handle", e);
Thread.sleep(UNKNOWN_HOST_WAIT_TIME_MILLIS);
}
} while (System.currentTimeMillis() < endTime);
throw new RuntimeException("Error creating zookeeper handle within timeout");
}
}
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