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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2731) HA: Autopopulate standby name dirs if they're empty
Date Mon, 12 Mar 2012 19:46:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-2731:

       Resolution: Fixed
    Fix Version/s: 0.23.3
     Release Note: The HA NameNode may now be started with the "-bootstrapStandby" flag. This
causes it to copy the namespace information and most recent checkpoint from its HA pair, and
save it to local storage, allowing an HA setup to be bootstrapped without use of rsync or
external tools.
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Committed to 23.3 and trunk, thanks for the reviews Aaron.
> HA: 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: New Feature
>          Components: ha
>    Affects Versions: 0.24.0
>            Reporter: Aaron T. Myers
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0, 0.23.3
>         Attachments: hdfs-2731.txt, hdfs-2731.txt, hdfs-2731.txt
> 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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