RocksDB vs in-memory store when not writing changelog to Kafka

[Jack Huang]

Hi all,

Is there any reason to use RocksDB without associating it to changelog in
Kafka? My understanding is that even though Rocks persists data to disk,
when container fails the partition might be restarted on a different
machine, where there is no persisted data on disk. In that case, wouldn't
it make sense to use a in-memory store (e.g. java.util.Map) instead since
Rocks effectively does not provide persistence under Samza's architecture?

Thanks,
Jack