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https://issues.apache.org/jira/browse/FLINK-2283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14900557#comment-14900557
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ASF GitHub Bot commented on FLINK-2283:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1155#issuecomment-141952418
It is for the "infinite state" aggregations.
I think this will fail if the types (input/output and key type) are not
serializable. For those to work a TypeSerializer must be used to but a
serialized value into the state map.
> Make grouped reduce/fold/aggregations stateful using Partitioned state
> ----------------------------------------------------------------------
>
> Key: FLINK-2283
> URL: https://issues.apache.org/jira/browse/FLINK-2283
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 0.10
> Reporter: Gyula Fora
> Assignee: Márton Balassi
> Priority: Minor
>
> Currently the inner state of the grouped aggregations are not persisted as an
> operator state.
> These operators should be reimplemented to use the newly introduced
> partitioned state abstractions which will make them fault tolerant and
> scalable for the future.
> A suggested implementation would be to use a stateful mapper to implement the
> desired behaviour.
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