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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7374) Allow decommissioning of dead DataNodes
Date Tue, 18 Nov 2014 20:05:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14216701#comment-14216701
] 

Zhe Zhang commented on HDFS-7374:
---------------------------------

[~andrew.wang] Thanks for helping out! The new change (reordering in {{registerDatanode}})
looks good to me. The 2 failed tests both pass locally for me. 

> Allow decommissioning of dead DataNodes
> ---------------------------------------
>
>                 Key: HDFS-7374
>                 URL: https://issues.apache.org/jira/browse/HDFS-7374
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7374-001.patch, HDFS-7374-002.patch, HDFS-7374.003.patch
>
>
> We have seen the use case of decommissioning DataNodes that are already dead or unresponsive,
and not expected to rejoin the cluster.
> The logic introduced by HDFS-6791 will mark those nodes as {{DECOMMISSION_INPROGRESS}},
with a hope that they can come back and finish the decommission work. If an upper layer application
is monitoring the decommissioning progress, it will hang forever.



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