GitHub user jimfcarroll opened a pull request:
https://github.com/apache/spark/pull/3254
[SPARK-4386] Improve performance when writing Parquet files.
If you profile the writing of a Parquet file, the single worst time
consuming call inside of
org.apache.spark.sql.parquet.MutableRowWriteSupport.write is actually in the
scala.collection.AbstractSequence.size call. This is because the size call
actually ends up COUNTING the elements in a
scala.collection.LinearSeqOptimized.length ("optimized?").
This doesn't need to be done. "size" is called repeatedly where needed
rather than called once at the top of the method and stored in a 'val'.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jimfcarroll/spark parquet-perf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3254.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 #3254
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commit 30cc0b592789befb7e212783846624a8a4d4381f
Author: Jim Carroll <[email protected]>
Date: 2014-11-13T20:40:52Z
Improve performance when writing Parquet files.
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