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https://issues.apache.org/jira/browse/HDFS-13810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590558#comment-16590558
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Brahma Reddy Battula commented on HDFS-13810:
---------------------------------------------
Both *update* and *add* will call *MountTable newEntry =
MountTable.newInstance(mount, destMap);* which will validate the record.
(update uses same as add,but update should add to existing entry,this can be
discussed HDFS-13853 )
Problem here is, when we trigger *addmount* twices*,*Second time we use
*UpdateMountTableEntryRequest* to add(mount record exists already) the record
which will not validate the record.
To solve this,
i) we might need remove *UpdateMountTableEntryRequest from* addmount which is
incompatiable and it's going to handle HDFS-13507.
ii) Need validate dest before passing to updatereqest Or provided patch.
IMO,HDFS-13507 should got only trunk as it's incompatible.. so we should go
with ii) for lower.
let me know your thought.
> RBF: UpdateMountTableEntryRequest isn't validating the record.
> ---------------------------------------------------------------
>
> Key: HDFS-13810
> URL: https://issues.apache.org/jira/browse/HDFS-13810
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: federation
> Affects Versions: 3.0.0, 2.9.1
> Reporter: venkata ram kumar ch
> Assignee: venkata ram kumar ch
> Priority: Minor
> Attachments: HDFS-13810-002.patch, HDFS-13810.patch
>
>
> In RBF when we try to update the existing mount entry by using the add
> command its creating a mount entry without performing the validation check /
> on the destination path.
> command : ./hdfs dfsrouteradmin -add /aaa ns1 /tmp (record added to the
> mount table)
> Now when we use the below command on the same mount entry.
> Command : hdfs dfsrouteradmin -add /aaa ns1 -order RANDOM (its not
> performing the validation check for the second time).
>
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