Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/9421#issuecomment-153673079
I there is a general problem that bugs me. I am not sure whether the KCL
guarantees that the IRecordProcessor.shutdown() will be called when the worker
is shutdown. From the source code of the KCL it seems that the shutdown will
only be called when the corresponding processor loses the shard lease or the
shard is terminated due to resharding. So we cannot guarantee the shutdown of
the KinesisCheckpointState will be called when the receiver stops.
For that to happen, the design needs to change. There should a central
single `KinesisCheckpointer` in the `KinesisReceiver` that is responsible for
checkpointing all the shards.All the `KinesisRecordProcessor`s register and
deregister their `IRecordProcessorCheckpointer` to the `KinesisCheckpointer`
for each `shardId`. For each shardId, the `KinesisCheckpointer` will
periodically try to call `KinesisRecordProcessor.checkpoint()` with the shardId
in `shardIdTolatestStoreSeqNumber`. As an optimization, it will keep track of
the last saved sequence number for each shardId and call checkpoint only if it
has changed. Finally, when the receiver is stopped, the
`KinesisCheckpointer.shutdown` will do a final round of checkpointing.
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