Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1690#issuecomment-205819299
I think the functionality is very desirable. In many cases, you really
don't want Flink to write something to Zookeeper for some random GroupId. This
floods ZooKeeper with garbage that helps no one.
I think that this is actually a kind of nice solution. The
`auto.commit.enable` in Flink means not necessary periodically, but "on
checkpoint or periodically".
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