[jira] [Updated] (KAFKA-2102) Remove unnecessary synchronization when managing metadata

["Jun Rao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao updated KAFKA-2102:
---------------------------
    Status: In Progress  (was: Patch Available)

> Remove unnecessary synchronization when managing metadata
> ---------------------------------------------------------
>
>                 Key: KAFKA-2102
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2102
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Tim Brooks
>            Assignee: Tim Brooks
>         Attachments: KAFKA-2102.patch, KAFKA-2102_2015-04-08_00:20:33.patch, KAFKA-2102_2015-04-15_19:55:45.patch, KAFKA-2102_2015-04-26_17:25:21.patch, eight-threads-patch.txt, eight-threads-trunk.txt, five-threads-patch.txt, five-threads-trunk.txt
>
>
> Usage of the org.apache.kafka.clients.Metadata class is synchronized. It seems like the current functionality could be maintained without synchronizing the whole class.
> I have been working on improving this by moving to finer grained locks and using atomic operations. My initial benchmarking of the producer is that this will improve latency (using HDRHistogram) on submitting messages.
> I have produced an initial patch. I do not necessarily believe this is complete. And I want to definitely produce some more benchmarks. However, I wanted to get early feedback because this change could be deceptively tricky.
> I am interested in knowing if this is:
> 1. Something that is of interest to the maintainers/community.
> 2. Along the right track
> 3. If there are any gotchas that make my current approach naive.



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