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Date: Fri, 4 May 2012 00:26:51 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3335) check for edit log corruption at the
 end of the log
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     [ https://issues.apache.org/jira/browse/HDFS-3335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-3335:
---------------------------------------

    Attachment: HDFS-3335.003.patch

* correctly handle pre-transactional edit logs

* in FSEditLogOp#readOp, catch Throwable.  Thi should be unecessary once HDFS-3134 is in, but it is not yet.
                
> check for edit log corruption at the end of the log
> ---------------------------------------------------
>
>                 Key: HDFS-3335
>                 URL: https://issues.apache.org/jira/browse/HDFS-3335
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 0.23.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-3335-b1.001.patch, HDFS-3335-b1.002.patch, HDFS-3335-b1.003.patch, HDFS-3335.001.patch, HDFS-3335.002.patch, HDFS-3335.003.patch
>
>
> Even after encountering an OP_INVALID, we should check the end of the edit log to make sure that it contains no more edits.
> This will catch things like rare race conditions or log corruptions that would otherwise remain undetected.  They will got from being silent data loss scenarios to being cases that we can detect and fix.
> Using recovery mode, we can choose to ignore the end of the log if necessary.

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