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