GitHub user zhuoliu opened a pull request:
https://github.com/apache/spark/pull/11060
[SPARK-11316] setupGroups in coalescedRDD causes super long delay.
In coalescedRDD, the setupGroups causes super long delay due to the O(n^2)
loop in the second while. That while is used to make sure that each
PartitionGroup contains at least one partition. In some cases, this while will
take O(n^2) to complete. If number of partitions is very large, this would take
tens of minutes or even hours to complete.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zhuoliu/spark 11316
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11060.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 #11060
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commit e202f579c994be49b255edd4014c0e7cfebaad78
Author: zhuol <zh...@yahoo-inc.com>
Date: 2016-02-03T21:21:50Z
[SPARK-11316] setupGroups in coalesceRDD causes super long delay due to the
O(n^2) loop.
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