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https://issues.apache.org/jira/browse/HDFS-13237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432935#comment-16432935
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Íñigo Goiri commented on HDFS-13237:
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[~maobaolong] thanks for the comments.
We introduced those methods in HDFS-13224 and HDFS-13250.

Regarding subclusters being down, I think the operations will fail.
We should add unit tests for those cases.

In  [^HDFS-13237.003.patch], we already add a disclaimer stating we don't have 
consistency.
We could make the wording stronger if you feel so.

> [Documentation] RBF: Mount points across multiple subclusters
> -------------------------------------------------------------
>
>                 Key: HDFS-13237
>                 URL: https://issues.apache.org/jira/browse/HDFS-13237
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Minor
>         Attachments: HDFS-13237.000.patch, HDFS-13237.001.patch, 
> HDFS-13237.002.patch, HDFS-13237.003.patch
>
>
> Document the feature to spread mount points across multiple subclusters.



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