GitHub user cmccabe opened a pull request:
https://github.com/apache/spark/pull/1486
SPARK-1767: Prefer HDFS-cached replicas when scheduling data-local tasks
This change reorders the replicas returned by
HadoopRDD#getPreferredLocations so that replicas cached by HDFS are at
the start of the list. This requires Hadoop 2.5 or higher; previous
versions of Hadoop do not expose the information needed to determine
whether a replica is cached.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cmccabe/spark SPARK-1767
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1486.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 #1486
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commit 4fe4e26ebb65b9b770ae2128f0bb5e62d9a9197a
Author: Colin Patrick Mccabe <[email protected]>
Date: 2014-07-17T18:25:56Z
SPARK-1767: Prefer HDFS-cached replicas when scheduling data-local tasks
This change reorders the replicas returned by
HadoopRDD#getPreferredLocations so that replicas cached by HDFS are at
the start of the list. This requires Hadoop 2.5 or higher; previous
versions of Hadoop do not expose the information needed to determine
whether a replica is cached.
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