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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7173) Only keep successfully loaded volumes in the configuration.
Date Fri, 24 Oct 2014 21:48:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183585#comment-14183585
] 

Colin Patrick McCabe commented on HDFS-7173:
--------------------------------------------

{code}
    /** The unchanged locations that are existed in the old configuration */
{code}
Should be "the unchanged locations that exist in the old configuration"

There's a whitepsace change in DataNode.java that isn't necessary, can we remove that?

+1 once those are addressed.

> Only keep successfully loaded volumes in the configuration.
> -----------------------------------------------------------
>
>                 Key: HDFS-7173
>                 URL: https://issues.apache.org/jira/browse/HDFS-7173
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 3.0.0, 2.6.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-7173.000.combo.patch, HDFS-7173.000.patch, HDFS-7173.001.combo.patch,
HDFS-7173.001.patch, HDFS-7173.002.combo.patch, HDFS-7173.002.patch
>
>
> Hot swapping data volumes might fail. The user should be able to fix the failed volumes
and disks, then ask the {{DataNode}} to retry the previously failed volumes. 
> To attempt to reload the failed volume again on the same directory, this failed directory
must not be presented in the {{Configuration}} object that {{DataNode has}}. Therefore, it
should only put successfully loaded volumes into the {{Configuration}} object.



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