GitHub user ConeyLiu opened a pull request:
https://github.com/apache/spark/pull/17300
[SPARK-19956][Core]Optimize a location order of blocks with topology
information
## What changes were proposed in this pull request?
When call the method getLocations of BlockManager, we only compare the data
block host. Random selection for non-local data blocks, this may cause the
selected data block to be in a different rack. So in this patch to increase the
sort of the rack.
## How was this patch tested?
New test case.
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ConeyLiu/spark blockmanager
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17300.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 #17300
----
commit 926ea2551487f170b24f06a0d6c11879103b05b5
Author: Xianyang Liu <[email protected]>
Date: 2017-03-15T02:42:49Z
optimize a location order of blocks with topology information
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