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From "Zesheng Wu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5682) Heterogeneous Storage phase 2 - APIs to expose Storage Types
Date Tue, 27 May 2014 23:53:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010512#comment-14010512

Zesheng Wu commented on HDFS-5682:

Thanks for the responses [~arpitagarwal]
bq.The function name should communicate that this is disk space quota for a specific storage
type, as opposed to the overall quotas which are set with setQuota. If the proposed name is
hard to follow, how about get/setsetQuotaByStorageType? 

Yes, get/setQuotaByStorageType will be clearer.

bq.Let's defer this for now. The API and protocol can both be easily extended in a backwards
compatible manner in the future without affecting existing applications.


bq. We have to differentiate between quota unavailability vs disk space availability. The
former will result in a quota violation exception, the latter will result in the behavior
you described. We discuss the reasons for this in the HDFS-2832 design doc.

Got it, thanks.  I will look into the HDFS-2832 doc for more details.

> Heterogeneous Storage phase 2 - APIs to expose Storage Types
> ------------------------------------------------------------
>                 Key: HDFS-5682
>                 URL: https://issues.apache.org/jira/browse/HDFS-5682
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: 20140522-Heterogeneous-Storages-API.pdf
> Phase 1 (HDFS-2832) added support to present the DataNode as a collection of discrete
storages of different types.
> This Jira is to track phase 2 of the Heterogeneous Storage work which involves exposing
Storage Types to applications and adding Quota Management support for administrators.
> This phase will also include tools support for administrators/users.

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