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From Aaron Davidson <ilike...@gmail.com>
Subject Re: Spark stalling during shuffle (maybe a memory issue)
Date Tue, 20 May 2014 04:09:28 GMT
This is very likely because the serialized map output locations buffer
exceeds the akka frame size. Please try setting "spark.akka.frameSize"
(default 10 MB) to some higher number, like 64 or 128.

In the newest version of Spark, this would throw a better error, for what
it's worth.



On Mon, May 19, 2014 at 8:39 PM, jonathan.keebler <jkeebler42@gmail.com>wrote:

> Has anyone observed Spark worker threads stalling during a shuffle phase
> with
> the following message (one per worker host) being echoed to the terminal on
> the driver thread?
>
> INFO spark.MapOutputTrackerActor: Asked to send map output locations for
> shuffle 0 to [worker host]...
>
>
> At this point Spark-related activity on the hadoop cluster completely halts
> .. there's no network activity, disk IO or CPU activity, and individual
> tasks are not completing and the job just sits in this state.  At this
> point
> we just kill the job & a re-start of the Spark server service is required.
>
> Using identical jobs we were able to by-pass this halt point by increasing
> available heap memory to the workers, but it's odd we don't get an
> out-of-memory error or any error at all.  Upping the memory available isn't
> a very satisfying answer to what may be going on :)
>
> We're running Spark 0.9.0 on CDH5.0 in stand-alone mode.
>
> Thanks for any help or ideas you may have!
>
> Cheers,
> Jonathan
>
>
>
>
> --
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> Sent from the Apache Spark User List mailing list archive at Nabble.com.
>

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