Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1417#issuecomment-160175731
I also tested this on a cluster with Kafka and very large state. The
backups and kafka I/O were running along smoothly and concurrently. The state
was big enough for the checkpoint interval to be too low. But with
@StephanEwen's recent fix I only ever saw one checkpoint in progress.
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