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YARN-5623. Apply SLIDER-1166 to yarn-native-services branch. Contributed by Gour Saha

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This commit is contained in:
Jian He 2016-09-12 10:44:39 +08:00
parent bce06ed1af
commit 9dc46aa379
2 changed files with 36 additions and 7 deletions
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7
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/client/SliderClient.java
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@ -604,11 +604,14 @@ protected ZKIntegration getZkClient(String clusterName, String user) throws Yarn
BlockingZKWatcher watcher = new BlockingZKWatcher();
client = ZKIntegration.newInstance(registryQuorum, user, clusterName, true, false, watcher,
ZKIntegration.SESSION_TIMEOUT);
client.init();
boolean fromCache = client.init();
if (!fromCache) {
watcher.waitForZKConnection(2 * 1000);
}
} catch (InterruptedException e) {
client = null;
log.warn("Unable to connect to zookeeper quorum {}", registryQuorum, e);
log.warn("Interrupted - unable to connect to zookeeper quorum {}",
registryQuorum, e);
} catch (IOException e) {
log.warn("Unable to connect to zookeeper quorum {}", registryQuorum, e);
}

34
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-slider/hadoop-yarn-slider-core/src/main/java/org/apache/slider/core/zk/ZKIntegration.java
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@ -33,6 +33,8 @@
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
@ -65,6 +67,8 @@ public class ZKIntegration implements Watcher, Closeable {
private final String clustername;
private final String userPath;
private int sessionTimeout = SESSION_TIMEOUT;
private static final Map<String, ZooKeeper> ZK_SESSIONS = new HashMap<>();
/**
flag to set to indicate that the user path should be created if
it is not already there
@ -93,10 +97,32 @@ protected ZKIntegration(String zkConnection,
this.userPath = mkSliderUserPath(username);
}
public void init() throws IOException {
assert zookeeper == null;
log.debug("Binding ZK client to {}", zkConnection);
zookeeper = new ZooKeeper(zkConnection, sessionTimeout, this, canBeReadOnly);
/**
* Returns true only if an active ZK session is available and retrieved from
* cache, false when it has to create a new one.
*
* @return true if from cache, false when new session created
* @throws IOException
*/
public synchronized boolean init() throws IOException {
if (zookeeper != null && getAlive()) {
return true;
}
synchronized (ZK_SESSIONS) {
if (ZK_SESSIONS.containsKey(zkConnection)) {
zookeeper = ZK_SESSIONS.get(zkConnection);
}
if (zookeeper == null || !getAlive()) {
log.info("Binding ZK client to {}", zkConnection);
zookeeper = new ZooKeeper(zkConnection, sessionTimeout, this,
canBeReadOnly);
ZK_SESSIONS.put(zkConnection, zookeeper);
return false;
} else {
return true;
}
}
}
/**