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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4322) StateRestoreCallback begin and end indication
Date Mon, 07 Nov 2016 19:56:58 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15645243#comment-15645243

ASF GitHub Bot commented on KAFKA-4322:

Github user markcshelton closed the pull request at:


> StateRestoreCallback begin and end indication
> ---------------------------------------------
>                 Key: KAFKA-4322
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4322
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions:
>            Reporter: Mark Shelton
>            Assignee: Guozhang Wang
>            Priority: Minor
> In Kafka Streams, the StateRestoreCallback interface provides only a single method "restore(byte[]
key, byte[] value)" that is called for every key-value pair to be restored. 
> It would be nice to have "beginRestore" and "endRestore" methods as part of StateRestoreCallback.
> Kafka Streams would call "beginRestore" before restoring any keys, and would call "endRestore"
when it determines that it is done. This allows an implementation, for example, to report
on the number of keys restored and perform a commit after the last key was restored. Other
uses are conceivable.

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