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Posted to hdfs-issues@hadoop.apache.org by "Eli Collins (Commented) (JIRA)" <ji...@apache.org> on 2012/03/01 00:57:57 UTC

[jira] [Commented] (HDFS-3025) Automatic log sync shouldn't happen inside logEdit path

    [ https://issues.apache.org/jira/browse/HDFS-3025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219667#comment-13219667 ] 

Eli Collins commented on HDFS-3025:
-----------------------------------

+1 looks good
                
> Automatic log sync shouldn't happen inside logEdit path
> -------------------------------------------------------
>
>                 Key: HDFS-3025
>                 URL: https://issues.apache.org/jira/browse/HDFS-3025
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node, performance
>    Affects Versions: 0.23.3
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3025.txt, hdfs-3025.txt
>
>
> HDFS-3020 fixes the "automatic log sync" functionality so that, when logEdits is called without log sync, it eventually triggers a sync. That sync ends up being inline, though, which means the FSN lock is usually held during it. This causes a bunch of threads to pile up.
> Instead, we should have it just set a "syncNeeded" flag and trigger a sync from another thread which isn't holding the lock (or from the same thread using a "logSyncIfNeeded" call).
> (credit to the FB branch for this idea)

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