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Posted to issues@spark.apache.org by "Nishkam Ravi (JIRA)" <ji...@apache.org> on 2015/05/30 01:14:17 UTC

[jira] [Created] (SPARK-7959) Uneven distribution of receivers in the cluster

Nishkam Ravi created SPARK-7959:
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             Summary: 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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