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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2018) Move all journal stream management code into one place
Date Thu, 07 Jul 2011 21:32:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061600#comment-13061600
] 

Sanjay Radia commented on HDFS-2018:
------------------------------------

HDFS 1580 (Journal class) is important to get into 0.23 since it will help us abstract away
fencing etc; HDFS-1580 is easier after this patch. 

If you are 2 weeks away from merging 1073 into trunk then we should commit this patch into
1073 branch since it does clean up the code and makes 1580 easier and makes the code simpler.

> 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: Improvement
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>             Fix For: Edit log branch (HDFS-1073)
>
>         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
>
>
> 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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