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https://issues.apache.org/jira/browse/KAFKA-3778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313233#comment-15313233
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Guozhang Wang commented on KAFKA-3778:
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[~h...@pinterest.com] I remember you already have some code fixes regarding
this issue, could you share your local commits as a reference?
> Change the RocksDB implementation for KStream windowed aggregations, to not
> use “range queries” but multiple gets
> -----------------------------------------------------------------------------------------------------------------
>
> 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
> 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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