GitHub user rdblue opened a pull request:
https://github.com/apache/spark/pull/14985
[SPARK-17396][core] Share the task support between UnionRDD instances.
## What changes were proposed in this pull request?
Share the ForkJoinTaskSupport between UnionRDD instances to avoid creating
a huge number of threads if lots of RDDs are created at the same time.
## How was this patch tested?
This uses existing UnionRDD tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rdblue/spark SPARK-17396-use-shared-pool
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14985.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 #14985
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commit 89065fd08cb2eb1e492571ce5980daa8f059a820
Author: Ryan Blue <[email protected]>
Date: 2016-09-06T23:18:32Z
SPARK-17396: Share the task support between UnionRDD instances.
This removes the private task support in each UnionRDD and replaces it
with a shared pool on the UnionRDD object.
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