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Date: Thu, 28 Apr 2011 02:26:03 +0000 (UTC)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1792) Add code to detect valid length of
 an edits file
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    [ https://issues.apache.org/jira/browse/HDFS-1792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026073#comment-13026073 ] 

Aaron T. Myers commented on HDFS-1792:
--------------------------------------

If the proposed change in HDFS-1846 gets checked in before this branch gets merged, you'll need to make a change here. That said, the code can be guaranteed to work, since the edits log will be guaranteed to end with 0xFFs instead of maybe being filled with 0x00s.

> 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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