GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/16977
[SPARK-19651][SQL] ParallelCollectionRDD.collect should not issue a Spark
job
## What changes were proposed in this pull request?
`ParallelCollectionRDD` already keeps the data, it doesn't make sense to
send the data to executors and collect it back when users call `collect`.
This PR override the `collect` method in `ParallelCollectionRDD`, and
return the data directly, with a round-trip serialization to simulate the
previously behavior and make sure `collect` returns a new copy of data.
## How was this patch tested?
existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark minor
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16977.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 #16977
----
commit c7f4300f3eb764713be0f353a8bb0aedda638d69
Author: Wenchen Fan <[email protected]>
Date: 2017-02-17T23:52:54Z
ParallelCollectionRDD.colect should not issuse a Spark job
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