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https://issues.apache.org/jira/browse/HELIX-96?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663753#comment-13663753
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kishore gopalakrishna commented on HELIX-96:
--------------------------------------------
Do you have the full stack trace, is it easy to reproduce this ? I want to
understand which helix api are you invoking from your code and if its in the
main thread of a separate thread.
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)
I can provide a patch that will throw exception but i dont know how you plan to
handle the exception.
> 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
> Assignee: Shi Lu
>
> During our failure testing with Zookeeper running in standalone 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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