GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/17442
[SPARK-20107][SQL] Speed up HadoopMapReduceCommitProtocol#commitJob for
many output files
## What changes were proposed in this pull request?
Set `mapreduce.fileoutputcommitter.algorithm.version=2` to speed up
[HadoopMapReduceCommitProtocol#commitJob](https://github.com/apache/spark/blob/v2.1.0/core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala#L121)
for many output files.
It can speed up `11 minutes` for 216869 output files.
This improvement can effect all cloudera's hadoop cdh5-2.6.0_5.4.0 higher
versions(see:
https://github.com/cloudera/hadoop-common/commit/1c1236182304d4075276c00c4592358f428bc433
and
https://github.com/cloudera/hadoop-common/commit/16b2de27321db7ce2395c08baccfdec5562017f0)
and apache's hadoop 2.7.0 higher versions.
## How was this patch tested?
Manual test and exist tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-20107
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17442.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 #17442
----
commit ad30e414d394018fb73a0a5b295542e5a5ec3255
Author: Yuming Wang <[email protected]>
Date: 2017-03-27T12:16:27Z
Speed up FileOutputCommitter#commitJob for many output files
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