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https://issues.apache.org/jira/browse/KAFKA-4322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15637668#comment-15637668
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ASF GitHub Bot commented on KAFKA-4322:
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GitHub user markcshelton opened a pull request:
https://github.com/apache/kafka/pull/2105
KAFKA-4322 StateRestoreCallback begin and end indication
This adds a begin and end callback to StateRestoreCallback.
The contribution is my original work and I license the work to Apache Kafka
under the Kafka's open source license.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/markcshelton/kafka KAFKA-4322
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2105.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2105
----
commit 9f59ea6ff2aac94bdd84eaafda36c860b12e1dcd
Author: Mark Shelton <[email protected]>
Date: 2016-11-04T20:57:37Z
changes KAFKA-4322 StateRestoreCallback begin and end indication
----
> 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: 0.10.0.1
> 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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