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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 16:01:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182781#comment-16182781
] 

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

Github user StefanRRichter commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4722#discussion_r141390478
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/state/StateBackendTestBase.java
---
    @@ -190,6 +193,39 @@ protected CheckpointStreamFactory createStreamFactory() throws Exception
{
     	}
     
     	@Test
    +	public void testGetKeys() throws Exception {
    +		final int elementsToTest = 1000;
    +		String fieldName = "get-keys-while-modifying-test";
    --- End diff --
    
    nit: this name is a bit misleading now


> 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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