Guozhang Wang created KAFKA-3184:
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Summary: Add Checkpoint for In-memory State Store
Key: KAFKA-3184
URL: https://issues.apache.org/jira/browse/KAFKA-3184
Project: Kafka
Issue Type: Sub-task
Reporter: Guozhang Wang
Currently Kafka Streams does not make a checkpoint of the persistent state
store upon committing, which would be expensive since it is "stopping the
world" and write on disks: for example, RocksDB would require you to copy the
file directory to make a copy naively.
However, for in-memory stores checkpointing maybe doable in an asynchronous
manner hence it can be done quickly. And the benefit of having intermediate
checkpoint is to avoid restoring from scratch if standby tasks are not present.
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