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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7374) Allow decommissioning of dead DataNodes
Date Sat, 15 Nov 2014 01:28:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14213247#comment-14213247
] 

Andrew Wang commented on HDFS-7374:
-----------------------------------

Yea, precisely :) I don't know how realistic this is in an active cluster with lots of failing
disks, but it'd fix it for some users at least.

> 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
>
>
> 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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