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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5115) Make StorageID a UUID
Date Thu, 22 Aug 2013 23:23:51 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HDFS-5115:
--------------------------------

          Resolution: Fixed
    Target Version/s: Heterogeneous Storage (HDFS-2832)
              Status: Resolved  (was: Patch Available)

Thanks for the review Nicholas. I committed this to branch HDFS-2832.
                
> Make StorageID a UUID
> ---------------------
>
>                 Key: HDFS-5115
>                 URL: https://issues.apache.org/jira/browse/HDFS-5115
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 3.0.0
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: h5115.01.patch, h5115.02.patch
>
>
> The Storage ID is currently generated from the DataNode's IP+Port+Random components.
This scheme will not work when we have separate Storage IDs for each storage directory as
there is a possibility of conflicts when an unreliable storage is intermittently offline.
> Converting it to a UUID makes collisions very unlikely.

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