GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/11308
[SPARK-12546][SQL] Change default number of open parquet files
A common problem that users encounter with Spark 1.6.0 is that writing to a
partitioned parquet table OOMs. The root cause is that parquet allocates a
significant amount of memory that is not accounted for by our own mechanisms.
As a workaround, we can ensure that only a single file is open per task unless
the user explicitly asks for more.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark parquetWriteOOM
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11308.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 #11308
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