GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/16204
[SPARK-18775][SQL] Limit the max number of records written per file - WIP
## What changes were proposed in this pull request?
Currently, Spark writes a single file out per task, sometimes leading to
very large files. It would be great to have an option to limit the max number
of records written per file in a task, to avoid humongous files.
This patch introduces a new write config option `maxRecordsPerFile`
(default to a session-wide setting `spark.sql.files.maxRecordsPerFile`) that
limits the max number of records written to a single file.
## How was this patch tested?
I tested this manually for now. Will add some automated tests once I see
what other tests are failing.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-18775
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16204.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 #16204
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commit fca401f19d717a25e0b6a028ce5ba7ad3b7b5ea2
Author: Reynold Xin <r...@databricks.com>
Date: 2016-12-08T00:45:10Z
[SPARK-18775][SQL] Limit the max number of records written per file
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