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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4988) Datanode must support all the volumes as individual storages
Date Wed, 25 Sep 2013 17:32:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777784#comment-13777784
] 

Arpit Agarwal commented on HDFS-4988:
-------------------------------------

Thanks for taking a look Nicholas.

I think renaming StorageID is necessary to avoid confusion. The new StorageUuid describes
a physical storage whereas StorageID was unique per Datanode. I am concerned that merging
another branch could introduce bugs if StorageID is being used per the older convention. By
renaming it we ensure a merge conflict or compile error. I agree we could skip renaming volumeMap.
However let me move the StorageID rename into a separate patch.
                
> Datanode must support all the volumes as individual storages
> ------------------------------------------------------------
>
>                 Key: HDFS-4988
>                 URL: https://issues.apache.org/jira/browse/HDFS-4988
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Suresh Srinivas
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-4988.01.patch, HDFS-4988.02.patch, HDFS-4988.03.patch, HDFS-4988.04.patch,
HDFS-4988.05.patch
>
>
> Currently all the volumes on datanode is reported as a single storage. This change proposes
reporting them as individual storage. This requires:
> # A unique storage ID for each storage
> #* This needs to be generated during formatting
> # There should be an option to allow existing disks to be reported as single storage
unit for backward compatibility.
> # A functionality is also needed to split the existing all volumes as single storage
unit to to individual storage units.
> # -Configuration must allow for each storage unit a storage type attribute. (Now HDFS-5000)-
> # Block reports must be sent on a per storage basis. In some cases (such memory tier)
block reports may need to be sent more frequently. That means block reporting period must
be on a per storage type basis.
> My proposal is for new clusters to configure volumes by default as separate storage unit.
Lets discuss.

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