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From Tathagata Das <>
Subject Re: combineByKey at ShuffledDStream.scala
Date Wed, 23 Jul 2014 05:05:43 GMT
Can you give an idea of the streaming program? Rest of the transformation
you are doing on the input streams?

On Tue, Jul 22, 2014 at 11:05 AM, Bill Jay <>

> Hi all,
> I am currently running a Spark Streaming program, which consumes data from
> Kakfa and does the group by operation on the data. I try to optimize the
> running time of the program because it looks slow to me. It seems the stage
> named:
> * combineByKey at ShuffledDStream.scala:42 *
> always takes the longest running time. And If I open this stage, I only
> see two executors on this stage. Does anyone has an idea what this stage
> does and how to increase the speed for this stage? Thanks!
> Bill

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