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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2283) Make grouped reduce/fold/aggregations stateful using Partitioned state
Date Sat, 03 Oct 2015 09:28:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942206#comment-14942206
] 

ASF GitHub Bot commented on FLINK-2283:
---------------------------------------

Github user mbalassi commented on the pull request:

    https://github.com/apache/flink/pull/1155#issuecomment-145230558
  
    Quick update:
    I made some progress on the custom state checkpointer solution, but run into an issue
with key selectors. This would break the current API usage of aggregations, so I need to solve
it or work around it first. [1]
    
    [1] https://issues.apache.org/jira/browse/FLINK-2812


> 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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