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https://issues.apache.org/jira/browse/HDFS-4196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499217#comment-13499217
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Jing Zhao commented on HDFS-4196:
---------------------------------
Aaron, thanks for the comments. For the synchronization from
SnapshotManager#createSnapshot, I think we may remove the synchronization in
the SnapshotManager, but explicitly acquiring the write lock of FSDirectory
seems still necessary to me. Otherwise it is possible that some operation tries
to change FSDir between individual FSDir read/write calls within
SnapshotManager#createSnapshot (although FSDir#getINode etc. needs to acquire
the read or write lock of FSDir). I'm not sure if FSNS locking can prevent this
scenario?
> Support renaming of snapshots
> -----------------------------
>
> Key: HDFS-4196
> URL: https://issues.apache.org/jira/browse/HDFS-4196
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: data-node, name-node
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-4196.001.patch, HDFS-4196.002.patch,
> HDFS-4196.003.patch
>
>
> Add the functionality of renaming an existing snapshot with a given new name.
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