GitHub user saurfang opened a pull request:
https://github.com/apache/spark/pull/9205
[SPARK-11244][SPARKR] sparkR.stop() should remove SQLContext
SparkR should remove `.sparkRSQLsc` and `.sparkRHivesc` when
`sparkR.stop()` is called. Otherwise even when SparkContext is reinitialized,
`sparkRSQL.init` returns the stale copy of the object and complains:
```r
sc <- sparkR.init("local")
sqlContext <- sparkRSQL.init(sc)
sparkR.stop()
sc <- sparkR.init("local")
sqlContext <- sparkRSQL.init(sc)
sqlContext
```
producing
```r
Error in callJMethod(x, "getClass") :
Invalid jobj 1. If SparkR was restarted, Spark operations need to be
re-executed.
```
I have added the check and removal only when SparkContext itself is
initialized. I have also added corresponding test for this fix. Let me know if
you want me to move the test to SQL test suite instead.
p.s. I tried lint-r but ended up a lots of errors on existing code.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/saurfang/spark sparkR.stop
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9205.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 #9205
----
commit 7f5154907ad45811722019f275b90cd12cff1134
Author: Forest Fang <forest.f...@outlook.com>
Date: 2015-10-21T19:49:00Z
remove SQLContext on stop
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