GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/6583
[SPARK-8014] [SQL] Avoid premature metadata discovery when writing a
HadoopFsRelation with a save mode other than Append
The current code references the schema of the DataFrame to be written
before checking save mode. This triggers expensive metadata discovery
prematurely. For save mode other than `Append`, this metadata discovery is
useless since we either ignore the result (for `Ignore` and `ErrorIfExists`) or
delete existing files (for `Overwrite`) later.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark spark-8014
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6583.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 #6583
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commit 8fbd93fe485d9d212944f340933235226e67ee82
Author: Cheng Lian <[email protected]>
Date: 2015-06-02T12:35:26Z
Fixes SPARK-8014
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