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From "Nanda kumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDDS-252) Eliminate the datanode ID file
Date Wed, 18 Jul 2018 20:24:00 GMT

    [ https://issues.apache.org/jira/browse/HDDS-252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548357#comment-16548357
] 

Nanda kumar commented on HDDS-252:
----------------------------------

Thanks [~bharatviswa] for updating the patch.
With this change, we cannot move a volume/disk from one datanode to another as the datanode
uuid is stored as part of each volume. If we move the volume it will cause inconsistency during
datanode startup. We will be having different datanode uuid in a single datanode and the last
volume which is getting initialized will update the uuid, this will become the node's uuid.

> Eliminate the datanode ID file
> ------------------------------
>
>                 Key: HDDS-252
>                 URL: https://issues.apache.org/jira/browse/HDDS-252
>             Project: Hadoop Distributed Data Store
>          Issue Type: Improvement
>            Reporter: Bharat Viswanadham
>            Assignee: Bharat Viswanadham
>            Priority: Major
>             Fix For: 0.2.1
>
>         Attachments: HDDS-252.00.patch, HDDS-252.01.patch, HDDS-252.02.patch
>
>
> This Jira is to remove the datanodeID file. After ContainerIO  work (HDDS-48 branch)
is merged, we have a version file in each Volume which stores datanodeUuid and some additional
fields in that file.
> And also if this disk containing datanodeId path is removed, that DN will now be unusable
with current code.



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