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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