GitHub user raofu opened a pull request:
https://github.com/apache/spark/pull/22157
[SPARK-25126] Avoid creating Reader for all orc files
In OrFileOperator.ReadSchema, a Reader is created for every file
although only the first valid one is used. This uses significant
amount of memory when there `paths` have a lot of files. In 2.3
a different code path OrcUtils.readSchema is used for inferring
schema for orc files. This commit change both function to creat
Reader lazily.
## What changes were proposed in this pull request?
(Please fill in changes proposed in this fix)
## How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/raofu/spark SPARK-25126
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22157.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 #22157
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commit 5a86b3618da695431c01ddbe4bb102a45f93b3b1
Author: Rao Fu <rao@...>
Date: 2018-08-17T23:40:05Z
[SPARK-25126] Avoid creating Reader for all orc files
In OrFileOperator.ReadSchema, a Reader is created for every file
although only the first valid one is used. This uses significant
amount of memory when there `paths` have a lot of files. In 2.3
a different code path OrcUtils.readSchema is used for inferring
schema for orc files. This commit change both function to creat
Reader lazily.
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