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From "Nishkam Ravi (JIRA)" <>
Subject [jira] [Commented] (SPARK-7959) Uneven distribution of receivers in the cluster
Date Mon, 01 Jun 2015 02:34:17 GMT


Nishkam Ravi commented on SPARK-7959:

New feature JIRA:

> Uneven distribution of receivers in the cluster
> -----------------------------------------------
>                 Key: SPARK-7959
>                 URL:
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 1.3.1, 1.4.0
>            Reporter: Nishkam Ravi
>         Attachments: Screen Shot 2015-05-29 at 3.52.01 PM.png
> Receivers are not getting scheduled as expected. Attached is a screenshot for 8 receivers
running on a cluster with 4 workers. In some cases, all receivers get scheduled on a single
node.  When the receivers get distributed evenly, the throughput can be upto 25% better (for
the workload experimented with). 
> Not sure if this is a known issue and I haven't investigated it further. But given that
I do see perfectly well distributed receivers (in round robin fashion) at times, my hunch
is that the receivers are racing with other jobs/tasks being scheduled. 

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