You are viewing a plain text version of this content. The canonical link for it is here.

Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (Created) (JIRA)" <ji...@apache.org> on 2012/02/28 20:37:46 UTC

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

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


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)

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira