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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