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https://issues.apache.org/jira/browse/HDFS-2987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214930#comment-13214930
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Suresh Srinivas commented on HDFS-2987:
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I did consider removing it earlier but decided to leave it alone. It might come
handy in the future, even though it is not used currently.
> DNA_SHUTDOWN command is never sent by the NN
> --------------------------------------------
>
> Key: HDFS-2987
> URL: https://issues.apache.org/jira/browse/HDFS-2987
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Todd Lipcon
> Priority: Trivial
> Labels: newbie
>
> The DataNode has a code path to handle a DNA_SHUTDOWN command, but in fact
> this command has never been sent by the NN (it was introduced by HADOOP-641
> in 0.8.0!)
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