[jira] [Resolved] (KAFKA-3778) Avoiding using range queries of RocksDBWindowStore on KStream windowed aggregations

["Eno Thereska (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-3778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eno Thereska resolved KAFKA-3778.
---------------------------------
    Resolution: Fixed

> Avoiding using range queries of RocksDBWindowStore on KStream windowed aggregations
> -----------------------------------------------------------------------------------
>
>                 Key: KAFKA-3778
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3778
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions: 0.10.1.0
>            Reporter: Eno Thereska
>            Assignee: Eno Thereska
>             Fix For: 0.10.1.0
>
>
> RocksDbWindowStore currently does not use caches, but its window segments implemented as RocksDbStore does. However, its range query {{fetch(key, fromTime, toTime)}} will cause all its touched segments' cache to be flushed. 
> After KAFKA-3777, we should change its implementation for KStreamWindowAggregation / KStreamWindowReduce to not use {{fetch}}, but just as multiple {{get}} calls on the underlying segments, one for each affected window range.



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