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Date: Mon, 21 Jun 2010 23:05:57 -0400 (EDT)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1222) NameNode fail stop in spite of
 multiple metadata directories
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    [ https://issues.apache.org/jira/browse/HDFS-1222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881034#action_12881034 ] 

Konstantin Shvachko commented on HDFS-1222:
-------------------------------------------

I did not understand the failure scenario. Could you please elaborate.
When the name-node gets an exception while loading image from one of the directories, does it fail or not?
Is it only the startup exceptions you are testing here?

> NameNode fail stop in spite of multiple metadata directories
> ------------------------------------------------------------
>
>                 Key: HDFS-1222
>                 URL: https://issues.apache.org/jira/browse/HDFS-1222
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20.1
>            Reporter: Thanh Do
>
> Despite the ability to configure multiple name directories
> (to store fsimage) and edits directories, the NameNode will fail stop 
> in most of the time it faces exception when accessing to these directories.
>  
> NameNode fail stops if an exception happens when loading fsimage,
> reading fstime, loading edits log, writing fsimage.ckpt ..., although there 
> are still good replicas. NameNode could have tried to work with other replicas,
> and marked the faulty one.
> This bug was found by our Failure Testing Service framework:
> http://www.eecs.berkeley.edu/Pubs/TechRpts/2010/EECS-2010-98.html
> For questions, please email us: Thanh Do (thanhdo@cs.wisc.edu) and 
> Haryadi Gunawi (haryadi@eecs.berkeley.edu)

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