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https://issues.apache.org/jira/browse/HDFS-5712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13862002#comment-13862002
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Brandon Li commented on HDFS-5712:
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Makes sense. Thanks!
> ViewFS should check the existence of the mapped namespace directories in the
> mount table
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-5712
> URL: https://issues.apache.org/jira/browse/HDFS-5712
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: federation
> Affects Versions: 3.0.0
> Reporter: Brandon Li
>
> ViewFS doesn't validate the mount table mapping. Even the mapped directory on
> NameNode doesn't exist, list directories or "dfs -ls" command can still show
> the mapped directory.
> This confuses users and applications when they try to create files under the
> mapped directories. They will get file-not-exist error but viewfs shows the
> directory exists.
> It would be less misleading if ViewFS can validate the mount table and
> report found errors.
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