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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1792) Add code to detect valid length of an edits file
Date Thu, 05 May 2011 02:20:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029107#comment-13029107
] 

Todd Lipcon commented on HDFS-1792:
-----------------------------------

Thanks for the feedback. I made the rename like you suggested. Please see HDFS-1892, which
is a related JIRA that takes into account the OP_INVALID based filler.

> Add code to detect valid length of an edits file
> ------------------------------------------------
>
>                 Key: HDFS-1792
>                 URL: https://issues.apache.org/jira/browse/HDFS-1792
>             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-1792.txt
>
>
> In some edit log corruption situations, it's useful to be able to determine the "valid"
length of an edit log. For this JIRA we define "valid" as the length of the file excluding
any trailing 0x00 bytes, usually left there by the preallocation done while writing. In the
future this API can be extended to look at edit checksums, etc.

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