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https://issues.apache.org/jira/browse/HDFS-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15456969#comment-15456969
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Chris Douglas commented on HDFS-7878:
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[~jingzhao] Good idea on {{FileHandle}}; I prefer that to {{InodeId}}, though
it's potentially confusing if we want to allow handles to directories, too
(e.g., if a process wanted to walk a subtree, ignoring parent renames).
bq. one question is how HdfsInodeId#nnId handles HA setup and different
FileSystem schemes
Good point. For HDFS, I don't think we care which protocol they use or which NN
the client contacts. Is {{clusterID}} the right identifier?
> API - expose an unique file identifier
> --------------------------------------
>
> Key: HDFS-7878
> URL: https://issues.apache.org/jira/browse/HDFS-7878
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Labels: BB2015-05-TBR
> Attachments: HDFS-7878.01.patch, HDFS-7878.02.patch,
> HDFS-7878.03.patch, HDFS-7878.04.patch, HDFS-7878.05.patch,
> HDFS-7878.06.patch, HDFS-7878.patch
>
>
> See HDFS-487.
> Even though that is resolved as duplicate, the ID is actually not exposed by
> the JIRA it supposedly duplicates.
> INode ID for the file should be easy to expose; alternatively ID could be
> derived from block IDs, to account for appends...
> This is useful e.g. for cache key by file, to make sure cache stays correct
> when file is overwritten.
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