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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2737) HA: Automatically trigger log rolls periodically on the active NN
Date Tue, 03 Jan 2012 02:10:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178596#comment-13178596

Aaron T. Myers commented on HDFS-2737:

I also support option 3 from above. I see little advantage to option 2, as it's only slightly
simpler than 3 and we might as well reuse the EditLogTailer thread. Option 1 (rolling based
on time or # txns) is really only a (potentially poor) proxy for #3, and doesn't seem much
> HA: Automatically trigger log rolls periodically on the active NN
> -----------------------------------------------------------------
>                 Key: HDFS-2737
>                 URL: https://issues.apache.org/jira/browse/HDFS-2737
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
> Currently, the edit log tailing process can only read finalized log segments. So, if
the active NN is not rolling its logs periodically, the SBN will lag a lot. This also causes
many datanode messages to be queued up in the PendingDatanodeMessage structure.
> To combat this, the active NN needs to roll its logs periodically -- perhaps based on
a time threshold, or perhaps based on a number of transactions. I'm not sure yet whether it's
better to have the NN roll on its own or to have the SBN ask the active NN to roll its logs.

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