Ming Fang created HELIX-96:
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Summary: ZkBaseDataAccessor.get() hangs during Zookeeper failure
Key: HELIX-96
URL: https://issues.apache.org/jira/browse/HELIX-96
Project: Apache Helix
Issue Type: Bug
Components: helix-core
Affects Versions: 0.6.0-incubating
Reporter: Ming Fang
During our failure testing with Zookeeper running in standard alone mode, we
sometimes see our application hanging in the callstack below...
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x187c1f10> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkUntil(LockSupport.java:237)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitUntil(AbstractQueuedSynchronizer.java:2072)
at org.I0Itec.zkclient.ZkClient.waitForKeeperState(ZkClient.java:636)
at org.I0Itec.zkclient.ZkClient.waitUntilConnected(ZkClient.java:619)
at org.I0Itec.zkclient.ZkClient.waitUntilConnected(ZkClient.java:615)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:679)
at org.apache.helix.manager.zk.ZkClient.readData(ZkClient.java:254)
at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:761)
at
org.apache.helix.manager.zk.ZkBaseDataAccessor.get(ZkBaseDataAccessor.java:315)
at
org.apache.helix.manager.zk.ZkCacheBaseDataAccessor.get(ZkCacheBaseDataAccessor.java:461)
The comment in ZKClient.java line 677 seems to say that eventually it would get
a Disconnected event and then throw an exception, but we waited for many
minutes.
Also we were able to resume by simply restarting Zookeeper.
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