[jira] [Updated] (KAFKA-1933) Fine-grained locking in log append

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

     [ https://issues.apache.org/jira/browse/KAFKA-1933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao updated KAFKA-1933:
---------------------------
    Fix Version/s:     (was: 0.8.3)

> Fine-grained locking in log append
> ----------------------------------
>
>                 Key: KAFKA-1933
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1933
>             Project: Kafka
>          Issue Type: Improvement
>          Components: log
>            Reporter: Maxim Ivanov
>            Assignee: Maxim Ivanov
>            Priority: Minor
>         Attachments: KAFKA-1933.patch, KAFKA-1933_2015-02-09_12:27:06.patch
>
>
> This patch adds finer locking when appending to log. It breaks
> global append lock into 2 sequential and 1 parallel phase.
> Basic idea is to allow every thread to "reserve" offsets in non
> overlapping ranges, then do compression in parallel and then
> "commit" write to log in the same order offsets where reserved.
> Results on a server with 16 cores CPU available:
> gzip: 564.0 sec -> 45.2 sec (12.4x speedup)
> LZ4: 56.7 sec -> 9.9 sec (5.7x speedup)
> Kafka was configured to run 16  IO threads, data was pushed using 32 netcat instances pushing in parallel batches of 200 msg 6.2 kb each (3264 MB in total)



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