GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/12068
[SPARK-14259][SQL] Add a FileSourceStrategy option for limiting #files in a
partition
## What changes were proposed in this pull request?
This pr is to add a config to control the maximum number of files as even
small files have a non-trivial fixed cost. The current packing can put a lot of
small files together which cases straggler tasks.
## How was this patch tested?
I added tests to check if many files get split into partitions in
FileSourceStrategySuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-14259
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12068.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 #12068
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commit 67cd08f3892b3a23ddeb4639f4e3649ac32b7a9a
Author: Takeshi YAMAMURO <[email protected]>
Date: 2016-03-30T11:18:01Z
Add an FileSourceStrategy option for limiting #files in a partition
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