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https://issues.apache.org/jira/browse/HDFS-14226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761401#comment-16761401
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Íñigo Goiri commented on HDFS-14226:
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For folders, that's why we have {{isPathAll()}}, folders will be in all
subclsuters in those cases.
For the other ones it will just be in one of them.
HASH will only have the folders in one of the subclusters, HASH_ALL will have
it all (same for RANDOM).
> RBF: Setting attributes should set on all subclusters' directories.
> -------------------------------------------------------------------
>
> Key: HDFS-14226
> URL: https://issues.apache.org/jira/browse/HDFS-14226
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Takanobu Asanuma
> Priority: Major
> Labels: RBF
> Attachments: HDFS-14226-HDFS-13891-01.patch
>
>
> Only one subcluster is set now.
> {noformat}
> // create a mount point of multiple subclusters
> hdfs dfsrouteradmin -add /all_data ns1 /data1
> hdfs dfsrouteradmin -add /all_data ns2 /data2
> hdfs ec -Dfs.defaultFS=hdfs://router:8888 -setPolicy -path /all_data -policy
> RS-3-2-1024k
> Set RS-3-2-1024k erasure coding policy on /all_data
> hdfs ec -Dfs.defaultFS=hdfs://router:8888 -getPolicy -path /all_data
> RS-3-2-1024k
> hdfs ec -Dfs.defaultFS=hdfs://ns1-namenode:8020 -getPolicy -path /data1
> RS-3-2-1024k
> hdfs ec -Dfs.defaultFS=hdfs://ns2-namenode:8020 -getPolicy -path /data2
> The erasure coding policy of /data2 is unspecified
> {noformat}
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