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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2018) Move all journal stream management code into one place
Date Wed, 15 Jun 2011 23:24:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050141#comment-13050141
] 

Todd Lipcon commented on HDFS-2018:
-----------------------------------

Hi Ivan. I've been thinking about this patch the last couple days and I think I agree we need
to do this. The difficulty seems to be in how we'll manage the current semantics when dealing
with upgrading an old storage directory, while also keeping the code paths manageable.

Let me look over the diff itself and see how it looks.

> 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
>
>
> 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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