GitHub user vanzin opened a pull request:
https://github.com/apache/spark/pull/18639
[SPARK-21408][core] Better default number of RPC dispatch threads.
Instead of using the host's cpu count, use the number of cores allocated
for the Spark process when sizing the RPC dispatch thread pool. This avoids
creating large thread pools on large machines when the number of allocated
cores is small.
Tested by verifying number of threads with spark.executor.cores set
to 1 and 4; same thing for YARN AM.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vanzin/spark SPARK-21408
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18639.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18639
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commit 85029e0a1c4347259997cae7e85bf6d432f83385
Author: Marcelo Vanzin <[email protected]>
Date: 2017-07-14T21:10:05Z
[SPARK-21408][core] Better default number of RPC dispatch threads.
Instead of using the host's cpu count, use the number of cores allocated
for the Spark process when sizing the RPC dispatch thread pool. This avoids
creating large thread pools on large machines when the number of allocated
cores is small.
Tested by verifying number of threads with spark.executor.cores set
to 1 and 4; same thing for YARN AM.
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