GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/9274
[SPARK-11307] Reduce memory consumption of OutputCommitCoordinator
OutputCommitCoordinator uses a map in a place where an array would suffice,
increasing its memory consumption for result stages with millions of tasks.
This patch replaces that map with an array. The only tricky part of this is
reasoning about the range of possible array indexes in order to make sure that
we never index out of bounds.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark SPARK-11307
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9274.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 #9274
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commit 9dc210e0b37bef7c08806f9292b4b66fae5a142e
Author: Josh Rosen <[email protected]>
Date: 2015-10-26T02:18:43Z
[SPARK-11307] Reduce memory consumption of OutputCommitCoordinator.
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