[jira] [Comment Edited] (KAFKA-4304) Extend Interactive Queries for return latest update timestamp per key

["Jeyhun Karimov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027964#comment-16027964 ] 

Jeyhun Karimov edited comment on KAFKA-4304 at 5/28/17 10:25 PM:
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From the user perspective, one would query {{ReadOnlyKeyValueStore#get(key)}} to get the corresponding value and then she would query again for {{ReadOnlyKeyValueStore#getKeyWithTs}} to get key's timestamp. As a result we search twice. This is only for specific use-cases like this.

Maybe we can overload {{ReadOnlyKeyValueStore#get}} method to return {{KeyWithTimestamp<K>}} and also add {{ReadOnlyKeyValueStore#get(key)}} for the use-cases only requiring just key timestamp.


was (Author: jeyhunkarimov):
From the user perspective, one would query {{ReadOnlyKeyValueStore#get(key)}} to get the corresponding value and then she would query again for {{ReadOnlyKeyValueStore#getKeyWithTs}} to get key's timestamp. As a result we search twice. This is only for specific use-cases like this. 

Maybe we can overload {{ReadOnlyKeyValueStore#get}} method to return {{KeyWithTimestamp<K>}}

> Extend Interactive Queries for return latest update timestamp per key
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-4304
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4304
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Matthias J. Sax
>            Priority: Minor
>              Labels: needs-kip
>
> Currently, when querying state store, it is not clear when the key was updated last. The ides of this JIRA is to make the latest update timestamp for each key-value-pair of the state store accessible.
> For example, this might be useful to
>  * check if a value was update but did not changed (just compare the update TS)
>  * if you want to consider only recently updated keys



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