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https://issues.apache.org/jira/browse/HDFS-16791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HDFS-16791.
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Resolution: Fixed
> Add getEnclosingRoot() API to filesystem interface and implementations
> ----------------------------------------------------------------------
>
> Key: HDFS-16791
> URL: https://issues.apache.org/jira/browse/HDFS-16791
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: fs
> Affects Versions: 3.3.6
> Reporter: Tom McCormick
> Assignee: Tom McCormick
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> At LinkedIn we run many HDFS volumes that are federated by either
> ViewFilesystem or Router Based Federation. As our number of hdfs volumes
> grows, we have a growing need to migrate data seemlessly across volumes.
> Many frameworks have a notion of staging or temp directories, but those
> directories often live in random locations. We want an API getEnclosingRoot,
> which provides the root path a file or dataset.
> In ViewFilesystem / Router Based Federation, the enclosingRoot will be the
> mount point.
> We will also take into account other restrictions for renames like
> encryptions zones.
> If there are several paths (a mount point and an encryption zone), we will
> return the longer path
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