[jira] [Updated] (ZOOKEEPER-2012) HBase client hangs after client-side OOM

["Qiang Tian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2012?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Qiang Tian updated ZOOKEEPER-2012:
----------------------------------

    Issue Type: Bug  (was: Improvement)

> HBase client hangs after client-side OOM
> ----------------------------------------
>
>                 Key: ZOOKEEPER-2012
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2012
>             Project: ZooKeeper
>          Issue Type: Bug
>            Reporter: Qiang Tian
>            Priority: Minor
>
> please see http://apache-hbase.679495.n3.nabble.com/HBase-client-hangs-after-client-side-OOM-td4062675.html.
> it looks the send thread caught the error successfully, as it is finally running fine.. but the cleanup fail to notify the main thread...so I suspect it is a very small timing hole that the packet is not on the 2 queues at the same time..it looks it could happen in the latest code ClientCnxnSocketNIO#doIO as well..
> potential fixes:
> 1)add timeout during wait
> 2)try/catch for the possible timing hole:
> {code}
>                   if (!p.bb.hasRemaining()) {
>                         sentCount++;
>                         outgoingQueue.removeFirstOccurrence(p);
>                         if (p.requestHeader != null
>                                 && p.requestHeader.getType() != OpCode.ping
>                                 && p.requestHeader.getType() != OpCode.auth) {
>                             synchronized (pendingQueue) {
>                                 pendingQueue.add(p);
>                             }
>                         }
>                     }
> {code}
> thoughts?
> thanks.



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