[jira] [Created] (SPARK-4370) Limit cores used by Netty transfer service based on executor size

["Aaron Davidson (JIRA)" <ji...@apache.org>]

Aaron Davidson created SPARK-4370:
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             Summary: Limit cores used by Netty transfer service based on executor size
                 Key: SPARK-4370
                 URL: https://issues.apache.org/jira/browse/SPARK-4370
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 1.2.0
            Reporter: Aaron Davidson
            Assignee: Aaron Davidson
            Priority: Critical


Right now, the NettyBlockTransferService uses the total number of cores on the system as the number of threads and buffer arenas to create. The latter is more troubling -- this can lead to significant allocation of extra heap and direct memory in situations where executors are relatively small compared to the whole machine. For instance, on a machine with 32 cores, we will allocate (32 cores * 16MB per arena = 512MB) * 2 for client and server = 1GB direct and heap memory. This can be a huge overhead if you're only using, say, 8 of those cores.



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