GitHub user jhu-chang opened a pull request:
https://github.com/apache/spark/pull/8881
[SPARK-10772][Streaming][Scala]: NullPointerException when transform
function in DStream returns NULL
Currently, the ```TransformedDStream``` will using
```Some(transformFunc(parentRDDs, validTime))``` as compute return value, when
the ```transformFunc``` somehow returns null as return value, the followed
operator will have NullPointerExeception.
This fix uses the ```Option()``` instead of ```Some()``` to deal with the
possible null value. When ```transformFunc``` returns ```null```, the option
will transform null to ```None```, the downstream can handle ```None```
correctly.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jhu-chang/spark Fix_Transform
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8881.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 #8881
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commit bd77f3cd5a2fac5d66dd4d89b0db176345cad9e3
Author: Jacker Hu <[email protected]>
Date: 2015-09-23T07:02:09Z
Fix SPARK-10772: using Option in TransformedDStream instead of Some
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