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