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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2731) Autopopulate standby name dirs if they're empty
Date Fri, 30 Dec 2011 00:55:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177478#comment-13177478
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Todd Lipcon commented on HDFS-2731:
-----------------------------------

bq. as an optimization it could copy the logs from the shared dir
I dont think it's necessarily an optimization - might actually be _easier_ to implement this
way :)

bq. If the other NN is still in standby then it should fail to start as it does currently
Can you explain what you mean by this? Why not allow it to download the image from the other
NN anyway?
                
> Autopopulate standby name dirs if they're empty
> -----------------------------------------------
>
>                 Key: HDFS-2731
>                 URL: https://issues.apache.org/jira/browse/HDFS-2731
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>
> To setup a SBN we currently format the primary then manually copy the name dirs to the
SBN. The SBN should do this automatically. Specifically, on NN startup, if HA with a shared
edits dir is configured and populated, if the SBN has empty name dirs it should downloads
the image and log from the primary (as an optimization it could copy the logs from the shared
dir). If the other NN is still in standby then it should fail to start as it does currently.

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