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Posted to jira@kafka.apache.org by "Bill Bejeck (JIRA)" <ji...@apache.org> on 2019/03/06 19:04:00 UTC

[jira] [Updated] (KAFKA-8007) In-memory window store copies on fetch

     [ https://issues.apache.org/jira/browse/KAFKA-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Bejeck updated KAFKA-8007:
-------------------------------
    Fix Version/s: 2.3.0

> In-memory window store copies on fetch
> --------------------------------------
>
>                 Key: KAFKA-8007
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8007
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 2.3.0
>            Reporter: Sophie Blee-Goldman
>            Assignee: Sophie Blee-Goldman
>            Priority: Major
>             Fix For: 2.3.0
>
>
> The current implementation of InMemoryWindowStore copies all record data into a new list and returns an iterator over that list when fetching. That is inefficient in terms of both memory and time. The fetching logic should be moved to the iterators, which could be cleaned up as well (currently they rely on ListIterator to provide peekNextKey() functionality, which is unnecessary). 



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