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https://issues.apache.org/jira/browse/HDFS-12666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662343#comment-16662343
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Ewan Higgs commented on HDFS-12666:
-----------------------------------
This is subsumed into HDFS-13777 patch 7.
> [PROVIDED Phase 2] Provided Storage Mount Manager (PSMM) mount
> --------------------------------------------------------------
>
> Key: HDFS-12666
> URL: https://issues.apache.org/jira/browse/HDFS-12666
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ewan Higgs
> Assignee: Ewan Higgs
> Priority: Major
> Attachments: HDFS-12666-HDFS-12090.001.patch
>
>
> Implement the Provided Storage Mount Manager. This is a service (thread) in
> the Namenode that manages backup mounts, unmounts, snapshotting, and
> monitoring the progress of backups.
> On mount, the mount manager writes XATTR information at the top level of the
> mount to do the appropriate bookkeeping. This is done to maintain state in
> case the Namenode falls over.
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