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https://issues.apache.org/jira/browse/HDFS-4196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499221#comment-13499221
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Aaron T. Myers commented on HDFS-4196:
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I don't *think* that will be a problem, as nothing that changes the actual
INode structures should be grabbing the FSDir lock without also grabbing the
FSNS lock. But regardless, it shouldn't hurt to over-lock the FSDir in this
situation.
Then how about this for the locking structure of snapshot operations:
# Lock the FSNS lock in FSNS before calling into SnapshotManager methods.
# Lock the FSDir lock in the SnapshotManager methods themselves.
How does this sound?
> 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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