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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7683) Add method to iterate over all of the existing keys in a statebackend
Date Wed, 27 Sep 2017 12:27:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182475#comment-16182475
] 

ASF GitHub Bot commented on FLINK-7683:
---------------------------------------

Github user pnowojski commented on the issue:

    https://github.com/apache/flink/pull/4722
  
    We have got carried away with those concurrent modifications and snapshots. To rewrite
keyed state variable from an old to a new one, old is used as a read only. Thus `getKeys`
for the the old one doesn't have to care about any modifications. 
    
    I have reverted snapshot rocks db changes.


> Add method to iterate over all of the existing keys in a statebackend
> ---------------------------------------------------------------------
>
>                 Key: FLINK-7683
>                 URL: https://issues.apache.org/jira/browse/FLINK-7683
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski
>
> This is required to make possible preserving backward compatibility while changing state
definition of a keyed state operator (to do so operator must iterate over all of the existing
keys and rewrites them into a new state variable).



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