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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2737) HA: Automatically trigger log rolls periodically on the active NN
Date Sat, 21 Jan 2012 03:14:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190293#comment-13190293
] 

Todd Lipcon commented on HDFS-2737:
-----------------------------------

+1
                
> 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: Aaron T. Myers
>         Attachments: HDFS-2737-HDFS-1623.patch, HDFS-2737-HDFS-1623.patch, HDFS-2737-HDFS-1623.patch,
HDFS-2737-HDFS-1623.patch, hdfs-2737-prelim.txt
>
>
> 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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