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From "Robert Metzger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2081) Change order of restore state and open for Streaming Operators
Date Wed, 27 May 2015 14:39:17 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561084#comment-14561084
] 

Robert Metzger commented on FLINK-2081:
---------------------------------------

Can we come to an agreement here?
I think both approaches are equal. Its a matter of estimating which case is more frequent.

I'll now implement the {{PersistentKafkaSource}} assuming that {{restoreState()}} is called
before {{open()}}. Whoever changes the order as part of this issue has to change that in the
KafkaSource as well.

> Change order of restore state and open for Streaming Operators
> --------------------------------------------------------------
>
>                 Key: FLINK-2081
>                 URL: https://issues.apache.org/jira/browse/FLINK-2081
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> Right now, the order is restore state -> open. Users often set internal state in the
open method, this would overwrite state that was restored from a checkpoint. If we change
the order to open -> restore this should not be a problem anymore.



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