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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3510) Some FSEditLog pre-allocation problems in branch-1
Date Tue, 05 Jun 2012 22:18:23 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-3510:
---------------------------------------

    Status: Patch Available  (was: Open)
    
> Some FSEditLog pre-allocation problems in branch-1
> --------------------------------------------------
>
>                 Key: HDFS-3510
>                 URL: https://issues.apache.org/jira/browse/HDFS-3510
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 1.0.0
>
>         Attachments: HDFS-3510-b1.001.patch
>
>
> In the FSEditLog, we want to avoid running out of space in the middle of writing an edit
log operation to the disk.  We do this by a process called "preallocation"-- reserving space
on the disk for the upcoming edit log entries before beginning to write them.
> branch-1 has some major problems with the way it does preallocation.  These problems
can lead to corrupt edit logs when the disk runs out of space during an edit log sync operation.

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