maobaolong commented on HDFS-13237:

[~elgoiri] Thank you for this documentation update.

Would you like to introduce where we use those 
"HASH|LOCAL|RANDOM|HASH_ALL|SPACE" modes, and in each mode, what we should 

Such as, RANDOM mode, i think we should know a series mkdir operation under a 
parent dir could transfer to any of the targets, so if one of the target ns 
down, the listing or du operation will get the wrong result. I think this is a 
terrible thing.

> [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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