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Date: Sat, 19 May 2012 00:36:07 +0000 (UTC)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3368) Missing blocks due to bad DataNodes
 comming up and down.
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    [ https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279368#comment-13279368 ] 

Konstantin Shvachko commented on HDFS-3368:
-------------------------------------------

Thanks for the review.
Name change makes sense.
I was thinking about making it configurable, but decided not to introduce yet another parameter. The value is chosen based on experimental data. If you feel strongly about making it a configuration key, I can add an undocumented parameter.
                
> Missing blocks due to bad DataNodes comming up and down.
> --------------------------------------------------------
>
>                 Key: HDFS-3368
>                 URL: https://issues.apache.org/jira/browse/HDFS-3368
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0, 1.0.0, 2.0.0, 3.0.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: blockDeletePolicy-0.22.patch, blockDeletePolicy-trunk.patch, blockDeletePolicy.patch
>
>
> All replicas of a block can be removed if bad DataNodes come up and down during cluster restart resulting in data loss.

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