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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