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Posted to dev@kafka.apache.org by "Sophie Blee-Goldman (JIRA)" <ji...@apache.org> on 2019/02/27 06:32:00 UTC

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

Sophie Blee-Goldman created KAFKA-8007:
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             Summary: In-memory window store copies on fetch
                 Key: KAFKA-8007
                 URL: https://issues.apache.org/jira/browse/KAFKA-8007
             Project: Kafka
          Issue Type: Improvement
            Reporter: Sophie Blee-Goldman
            Assignee: Sophie Blee-Goldman


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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