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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1496) TestStorageRestore is failing after HDFS-903 fix
Date Sat, 13 Nov 2010 00:08:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931589#action_12931589
] 

Hairong Kuang commented on HDFS-1496:
-------------------------------------

This turns out to be a bug in storage directory restoration. Image validation exposes the
error.

Currently NN uses rollFSEdits to trigger storage directory recovery. The recovery may trigger
a saving of the namespace to the newly restored directory which as a result changes in memory
image digest. However later on image & edits were fetched from an old storage directory,
thus causing the checksum mismatch.

The problem with this storage restoration scheme is that it makes the on-disk state of all
storage directories inconsistent.

> TestStorageRestore is failing after HDFS-903 fix
> ------------------------------------------------
>
>                 Key: HDFS-1496
>                 URL: https://issues.apache.org/jira/browse/HDFS-1496
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Konstantin Boudnik
>            Assignee: Hairong Kuang
>
> TestStorageRestore seems to be failing after HDFS-903 commit. Running git bisect confirms
it.

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