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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2018) 1073: Move all journal stream management code into one place
Date Thu, 11 Aug 2011 21:04:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083528#comment-13083528
] 

Jitendra Nath Pandey commented on HDFS-2018:
--------------------------------------------

>The APIs here feel a little strange, how FSEditLog has to keep going back to JournalManager
to find the next stream, and 
>then JournalManager is calling "listFiles" over and over again.
I didn't get the concern here. selectStream calls getNumberOfTransactions on each journal
and then chooses the best one. Am I looking at different part of the code from what you are
referring to?




> 1073: Move all journal stream management code into one place
> ------------------------------------------------------------
>
>                 Key: HDFS-2018
>                 URL: https://issues.apache.org/jira/browse/HDFS-2018
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: 0.23.0
>
>         Attachments: HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff,
HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff,
HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff, HDFS-2018.diff
>
>
> Currently in the HDFS-1073 branch, the code for creating output streams is in FileJournalManager
and the code for input streams is in the inspectors. This change does a number of things.
>   - Input and Output streams are now created by the JournalManager.
>   - FSImageStorageInspectors now deals with URIs when referring to edit logs
>   - Recovery of inprogress logs is performed by counting the number of transactions instead
of looking at the length of the file.
> The patch for this applies on top of the HDFS-1073 branch + HDFS-2003 patch.

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