Github user ahmed-mahran commented on the issue:
https://github.com/apache/spark/pull/13866
The idea is about removing persisted RDDs and BlockRDDs data. Setting
StreamingContext to null would make driver-side metadata GCed but not cached
blocks, right?
What makes this significant is that when checkpointing is enabled, the
remember duration is set at least twice the checkpoint duration (usually
checkpoint duration is assumed to be relatively large).
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