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https://issues.apache.org/jira/browse/HDFS-13255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16706074#comment-16706074
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Ayush Saxena commented on HDFS-13255:
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Thanks [~wuweiwei] for putting this up.
I think there are quite a few reasons for this happening.
Firstly /rm-test-all is not mounted --> So while resolving it will try to find
that mount point and respective destinations.But won't find any thus no
deletion.
Secondly --> Am not pretty sure that whether we allow to delete a mount entry
which is created by an admin by a regular user.The user has the permissions
over the destinations, Not on the mount point.For the mount point operation
Admin only has the permissions.
Thirdly --> If we consider deleting in such a recursive manner by the admin and
give such capabilities.We will be in a threat to loose our entire mount table
in one operation.
If the mount existed then if we had called the rm .It would delete the
destination folder which is mounted which the owner had permissions but the
leave the mount-point for the admin to decide.That is how I suppose mounting is
supposed to work at user level.Route all requests to actual destination.
Not sure whether actually we can do anything in such scenario or not.
> RBF: Fail when try to remove mount point paths
> ----------------------------------------------
>
> Key: HDFS-13255
> URL: https://issues.apache.org/jira/browse/HDFS-13255
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Weiwei Wu
> Priority: Major
>
> when delete a ns-fed path which include mount point paths, will issue a error.
> Need to delete each mount point path independently.
> Operation step:
> {code:java}
> [hadp@root]$ hdfs dfsrouteradmin -ls
> Mount Table Entries:
> Source Destinations Owner Group Mode Quota/Usage
> /rm-test-all/rm-test-ns10 ns10->/rm-test hadp hadp rwxr-xr-x [NsQuota: -/-,
> SsQuota: -/-]
> /rm-test-all/rm-test-ns2 ns1->/rm-test hadp hadp rwxr-xr-x [NsQuota: -/-,
> SsQuota: -/-]
> [hadp@root]$ hdfs dfs -ls hdfs://ns-fed/rm-test-all/rm-test-ns10/
> Found 2 items
> -rw-r--r-- 3 hadp supergroup 3118 2018-03-07 21:52
> hdfs://ns-fed/rm-test-all/rm-test-ns10/core-site.xml
> -rw-r--r-- 3 hadp supergroup 7481 2018-03-07 21:52
> hdfs://ns-fed/rm-test-all/rm-test-ns10/hdfs-site.xml
> [hadp@root]$ hdfs dfs -ls hdfs://ns-fed/rm-test-all/rm-test-ns2/
> Found 2 items
> -rw-r--r-- 3 hadp supergroup 101 2018-03-07 16:57
> hdfs://ns-fed/rm-test-all/rm-test-ns2/NOTICE.txt
> -rw-r--r-- 3 hadp supergroup 1366 2018-03-07 16:57
> hdfs://ns-fed/rm-test-all/rm-test-ns2/README.txt
> [hadp@root]$ hdfs dfs -ls hdfs://ns-fed/rm-test-all/rm-test-ns10/
> Found 2 items
> -rw-r--r-- 3 hadp supergroup 3118 2018-03-07 21:52
> hdfs://ns-fed/rm-test-all/rm-test-ns10/core-site.xml
> -rw-r--r-- 3 hadp supergroup 7481 2018-03-07 21:52
> hdfs://ns-fed/rm-test-all/rm-test-ns10/hdfs-site.xml
> [hadp@root]$ hdfs dfs -rm -r hdfs://ns-fed/rm-test-all/
> rm: Failed to move to trash: hdfs://ns-fed/rm-test-all. Consider using
> -skipTrash option
> [hadp@root]$ hdfs dfs -rm -r -skipTrash hdfs://ns-fed/rm-test-all/
> rm: `hdfs://ns-fed/rm-test-all': Input/output error
> {code}
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