Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/6268#issuecomment-103674646
@tdas Most of the changes are actually not required, because they
eventually get cleaned later through other methods. We established this rule in
#5787.
So the only places that are actually required are: `filter`,
`combineByKey`, `mapValues` and `flatMapValues`.
Additionally there are a few calls in `updateStateByKey` that need to be
cleaned. In general, the following pattern needs cleaning:
```
def somePublicMethod(func: () => Int): Unit = {
val cleanedF = sc.clean(func)
new SomeRDD(this, (unused: Int) => cleanedF())
}
```
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