a502e4b845
Currently, the background checkpointing thread fails silently if the checkpoint is not serializable. It is hard to debug and therefore its best to fail fast at `start()` when checkpointing is enabled and the checkpoint is not serializable.
Author: Tathagata Das <tathagata.das1565@gmail.com>
Closes #6292 from tdas/SPARK-7767 and squashes the following commits:
51304e6 [Tathagata Das] Addressed comments.
c35237b [Tathagata Das] Added test for checkpoint serialization in StreamingContext.start()
(cherry picked from commit
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