GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/6352
[SPARK-7826][CORE] Suppress extra calling getCacheLocs.
There are too many extra call method `getCacheLocs` for `DAGScheduler`,
which includes Akka communication.
To improve `DAGScheduler` performance, suppress extra calling the method.
In my application with over 1200 stages, the execution time became 3.8 min
from 8.5 min with my patch.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-7826
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6352.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 #6352
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commit 9a80fad6b2f5d73e206aacf72cd5e075fa8bcba0
Author: Takuya UESHIN <[email protected]>
Date: 2015-05-22T08:31:02Z
Suppress extra calling getCacheLocs.
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