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https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279930#comment-13279930
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Aaron T. Myers commented on HDFS-3368:
--------------------------------------

bq. 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.

IMO, we should add a configuration option for it. Even if it's unlikely to 
change, if someone does want to change it they'll thank us that they don't have 
to change the code/recompile to do so.
                
> 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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