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https://issues.apache.org/jira/browse/HDFS-15554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17199561#comment-17199561
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Fengnan Li commented on HDFS-15554:
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Thanks [~ayushtkn] [~elgoiri] !
> RBF: force router check file existence in destinations before adding/updating
> mount points
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-15554
> URL: https://issues.apache.org/jira/browse/HDFS-15554
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> Adding/Updating mount points right now is only a router action without
> validation in the downstream namenodes for the destination files/directories.
> In practice we have set up the dangling mount points and when clients call
> listStatus they would get the file returned, but then if they try to access
> the file FileNotFoundException would be thrown out.
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