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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-5232) Protocol changes to transmit StorageUuid
Date Fri, 20 Sep 2013 22:06:55 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal resolved HDFS-5232.
---------------------------------

       Resolution: Fixed
    Fix Version/s: Heterogeneous Storage (HDFS-2832)

Thanks Nicholas! I have committed this to branch HDFS-2832.
                
> Protocol changes to transmit StorageUuid
> ----------------------------------------
>
>                 Key: HDFS-5232
>                 URL: https://issues.apache.org/jira/browse/HDFS-5232
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client, namenode
>    Affects Versions: Heterogeneous Storage (HDFS-2832)
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: Heterogeneous Storage (HDFS-2832)
>
>         Attachments: HDFS-5232.01.patch, HDFS-5232.02.patch, HDFS-5232.03.patch
>
>
> Currently the StorageID is used to identify both the Datanode and the storage. This works
because we treat all storages attached to the Datanode as a single storage unit.
> We plan to replace the StorageID with two independent IDs:
> # Datanode UUID - this will be a string that uniquely identifies each Datanode in the
cluster. For upgraded clusters, the Datanode UUID will be the StorageID prior to the upgrade.
i.e. we will reuse the prior Storage ID.
> # Storage UUID - Each storage attached to the datanode will be identified by a UUID.

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