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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1793) Add code to inspect a storage directory with txid-based filenames
Date Fri, 01 Apr 2011 03:46:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-1793:

    Attachment: HDFS-1793.txt

Rebased on committed versions of 1538 and 1792.

Also changed the name FSImageCurrentStorageInspector to FSImageTransactionalStorageInspector,
since "current" is always relative.

I will be committing this version of the patch to the branch, please feel free to reopen this
JIRA or file a new one if you have any comments.

> Add code to inspect a storage directory with txid-based filenames
> -----------------------------------------------------------------
>                 Key: HDFS-1793
>                 URL: https://issues.apache.org/jira/browse/HDFS-1793
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>         Attachments: HDFS-1793.txt, hdfs-1793.txt
> After HDFS-1538, the startup of the NN is done with the following phases:
> - Inspect storage directories
> - Formulate a "load plan", where a load plan is:
> -- A set of recovery actions (eg deleting half-uploaded checkpoint uplods)
> -- The fsimage to restore
> -- A sequence of edit logs to replay
> - Run the recovery
> - Load specified image
> - Load specified edits.
> This JIRA adds code to inspect a set of storage directories where the image and edits
files are named according to the scheme designed in HDFS-1073, and formulate such a load plan.

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