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Posted to dev@bookkeeper.apache.org by "Ivan Kelly (JIRA)" <ji...@apache.org> on 2013/07/29 14:45:48 UTC

[jira] [Commented] (BOOKKEEPER-664) Compaction increases latency on journal writes

    [ https://issues.apache.org/jira/browse/BOOKKEEPER-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13722403#comment-13722403 ] 

Ivan Kelly commented on BOOKKEEPER-664:
---------------------------------------

Hmm, I can't find the changes on Twitter's branch now :/. I'll reimplement as it's a simple fix anyhow.
                
> Compaction increases latency on journal writes
> ----------------------------------------------
>
>                 Key: BOOKKEEPER-664
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-664
>             Project: Bookkeeper
>          Issue Type: Bug
>    Affects Versions: 4.2.1
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 4.2.2, 4.3.0
>
>
> Compaction writes to the journal to avoid data loss (see BOOKKEEPER-530). BOOKKEEPER-530 correctly identified that this may affect latency on the journal but we have observed this since in production. It is possible to avoid the journal completely, as twitter do in their github branch. Basically, we need to write to the entrylogger first, flush the entry log and then add to the index.

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