GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/7154
[SPARK-8756][SQL] Keep cached information and avoid re-calculating footers
in ParquetRelation2
JIRA: https://issues.apache.org/jira/browse/SPARK-8756
Currently, in ParquetRelation2, footers are re-read every time refresh() is
called. But we can check if it is possibly changed before we do the reading
because reading all footers will be expensive when there are too many
partitions. This pr fixes this by keeping some cached information to check it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 cached_footer_parquet_relation
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7154.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 #7154
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commit 0ef8caf461d0a0ef7eee6bbc78db600bc46dc846
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-07-01T09:41:53Z
Keep cached information and avoid re-calculating footers.
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