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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3368) Missing blocks due to bad DataNodes comming up and down.
Date Mon, 21 May 2012 19:55:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13280418#comment-13280418
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Konstantin Shvachko commented on HDFS-3368:
-------------------------------------------

I incorporated Nicholas's comments.
Double checking on the configuration parameter before changing it. 
Aaron, sounds like you would generally prefer configuration parameters to constants. But this
is not always a good approach. There were many discussions in the past about it. People are
getting confused if you give them too many parameters that they have to understand in order
to change. This one is hardly to be ever changed by anybody. 
So I am asking whether you feel strong about making it an undocumented config 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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