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From Zach Cox <zcox...@gmail.com>
Subject Kafka state backend?
Date Tue, 05 Apr 2016 20:24:00 GMT
Hi - as clarified in another thread [1] stateful operators store all of
their current state in the backend on each checkpoint. Just curious if
Kafka topics with log compaction have ever been considered as a possible
state backend?

Samza [2] uses RocksDB as a local state store, with all writes also going
to a log-compacted Kafka topic for persistence. This seems like it might
also be a good alternative backend in Flink for jobs with large amounts of
long-lasting state. You would give up some throughput (due to Kafka
producer writes) but there would be almost nothing to do on checkpoints.

Just wanted to propose the idea and see if it has already been discussed,
or maybe I'm missing some reasons why it would be a bad idea.

Thanks,
Zach

[1]
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Checkpoint-state-stored-in-backend-and-deleting-old-checkpoint-state-td5927.html
[2]
http://samza.apache.org/learn/documentation/0.10/container/state-management.html#local-state-in-samza

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