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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2737) HA: Automatically trigger log rolls periodically on the active NN
Date Tue, 10 Jan 2012 05:38:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183093#comment-13183093
] 

Suresh Srinivas commented on HDFS-2737:
---------------------------------------

For the time being, it is okay not to read the editlog in progress and trigger editlog rolling
using existing JournalProtocol mechanism. We should revisit this in the future to read editlog
in progress.
                
> 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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