[jira] [Created] (KUDU-1962) NPE and lost callback in Java client when master queue overflows

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created KUDU-1962:
---------------------------------

             Summary: NPE and lost callback in Java client when master queue overflows
                 Key: KUDU-1962
                 URL: https://issues.apache.org/jira/browse/KUDU-1962
             Project: Kudu
          Issue Type: Bug
          Components: client
    Affects Versions: 1.3.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Blocker


An Impala user reported seeing the following stack trace in the frontend, followed by a query hanging in planning:

{code}
	
Mar 30, 2017 2:14:32 AM org.apache.kudu.client.shaded.org.jboss.netty.util.HashedWheelTimer
WARNING: An exception was thrown by TimerTask.
java.lang.NullPointerException
at org.apache.kudu.client.AsyncKuduClient.sendRpcToTablet(AsyncKuduClient.java:737)
at org.apache.kudu.client.AsyncKuduClient$2RetryTimer.run(AsyncKuduClient.java:1297)
at org.apache.kudu.client.shaded.org.jboss.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:556)
at org.apache.kudu.client.shaded.org.jboss.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:632)
at org.apache.kudu.client.shaded.org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:369)
at org.apache.kudu.client.shaded.org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at java.lang.Thread.run(Thread.java:745)
{code}



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