GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/13229
[SPARK-14031] [SQL] speedup CSV writer
## What changes were proposed in this pull request?
Currently, we create an CSVWriter for every row, it's very expensive and
memory hungry, took about 15 seconds to write out 1 mm rows (two columns).
This PR will write the rows in batch mode, create a CSVWriter for every 1k
rows, which could write out 1 mm rows in about 1 seconds (15X faster).
## How was this patch tested?
Manually benchmark it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark csv_writer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13229.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 #13229
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commit 43f3760bee09eb233a6bbf3d63b6cefbbc924998
Author: Davies Liu <[email protected]>
Date: 2016-05-20T20:04:35Z
speedup CSV writer
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