Re: Re: NPE in JobManager

Posted by Dave Marion on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/NPE-in-JobManager-tp11162p11181.html

Stephan,

Thanks for looking at this. Could you elaborate on the misbehavior in the accumulator? I'd like to fix it if it's incorrect.

Dave

On January 20, 2017 at 4:29 AM Stephan Ewen <[hidden email]> wrote:

Hi!

It seems that the accumulator behaves in a non-standard way, but the JobManager should also catch that (log a warning or debug message) and simply continue (not crash).

I'll try to add a patch that the JobManager tolerates these kinds of issues in the accumulators.

Stephan

On Thu, Jan 19, 2017 at 7:26 PM, Dave Marion <[hidden email]> wrote:

Noticed I didn't cc the user list.

---------- Original Message ----------
From: Dave Marion <[hidden email]>
To: Ted Yu <[hidden email]>
Date: January 19, 2017 at 12:13 PM
Subject: Re: NPE in JobManager

That might take some time. Here is a hand typed top N lines. If that is not enough let me know and I will start the process of getting the full stack trace.

NullPointerException

at JobManager$$updateAccumulators$1.apply(JobManager.scala:1790)

at JobManager$$updateAccumulators$1.apply(JobManager.scala:1788)

at scala.collection.mutable.ResizableArray$class.forEach(ArrayBuffer.scala:48)

at scala.collection.mutable.ArrayBuffer.forEach(ArrayBuffer.scala:48)

at org.apache.flink.runtime.jobmanager.JobManager.org$apache$flink$runtime$jobmanager$JobManager$$updateAccumulators(JobManager.scala:1788)

at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1.applyOrElse(JobManager.scala:967)

at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)

at org.apache.flink.runtime.LeaderSessionMassageFilter$$anonfun$receive$1.applyOrEslse(LeaderSessionMessageFilter.scala:44)

at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)

at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:33)

at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:28)

at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)

at org.apache.flink.runtime.LogMesages$$anon$1.applyOrElse(LogMessages.scala:28)

On January 19, 2017 at 11:58 AM Ted Yu <[hidden email]> wrote:

Can you pastebin the complete stack trace for the NPE ?

Thanks

On Thu, Jan 19, 2017 at 8:57 AM, Dave Marion <[hidden email]> wrote:

I'm running flink-1.1.4-bin-hadoop27-scala_2.11 and I'm running into an issue where after some period of time (measured in 1 - 3 hours) the JobManager gets an NPE and shuts itself down. The failure is at JobManager$$updateAccumulators$1.apply(JobManager.scala:1790). I'm using a custom accumulator[1], but can't tell from the JobManager code whether the issue is in my Accumulator, or is a bug in the JobManager.

[1] https://github.com/NationalSecurityAgency/timely/blob/master/analytics/src/main/java/timely/analytics/flink/SortedStringAccumulator.java