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Posted to jira@kafka.apache.org by "radai rosenblatt (Jira)" <ji...@apache.org> on 2020/04/12 19:49:00 UTC

[jira] [Created] (KAFKA-9855) dont waste memory allocating Struct and values objects for Schemas with no fields

radai rosenblatt created KAFKA-9855:
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             Summary: dont waste memory allocating Struct and values objects for Schemas with no fields
                 Key: KAFKA-9855
                 URL: https://issues.apache.org/jira/browse/KAFKA-9855
             Project: Kafka
          Issue Type: Improvement
          Components: core
    Affects Versions: 2.4.1, 2.4.0
            Reporter: radai rosenblatt
            Assignee: radai rosenblatt


at the time of this writing there are 6 schemas in kafka APIs with no fields - 3 versions each of LIST_GROUPS and API_VERSIONS.

under some workloads this may result in the creation of a lot of Struct objects with an Object[0] for values when deserializing those requests from the wire.

in one particular heap dump we've found a significant amount of heap space wasted on creating such objects.



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