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

    [ https://issues.apache.org/jira/browse/SPARK-7959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566891#comment-14566891
] 

Nishkam Ravi commented on SPARK-7959:
-------------------------------------

New feature JIRA: https://issues.apache.org/jira/browse/SPARK-7988

> Uneven distribution of receivers in the cluster
> -----------------------------------------------
>
>                 Key: SPARK-7959
>                 URL: https://issues.apache.org/jira/browse/SPARK-7959
>             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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