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https://issues.apache.org/jira/browse/HDFS-2981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213103#comment-13213103
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Todd Lipcon commented on HDFS-2981:
-----------------------------------

I disagree that it should be true by default. Apps like HBase which are 
latency-sensitive don't want to wait for a whole block to be re-transferred 
when a node in the pipeline fails. Apps which are long-running writes and 
non-latency-sensitive (eg log collection) can flip this to true on their own 
client, no?
                
> The default value of 
> dfs.client.block.write.replace-datanode-on-failure.enable should be true
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2981
>                 URL: https://issues.apache.org/jira/browse/HDFS-2981
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h2981_20120221.patch
>
>
> There was a typo earlier in the default value of 
> dfs.client.block.write.replace-datanode-on-failure.enable.  Then, HDFS-2944 
> changed from "ture" to "false".  It should be changed to "true".

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