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https://issues.apache.org/jira/browse/HDFS-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15456737#comment-15456737
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Jing Zhao commented on HDFS-7878:
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So the InodeId is actually a file handler? Maybe in that sense to directly have
a {{open(FileHandler)}} is OK?
For the patch, one question is how {{HdfsInodeId#nnId}} handles HA setup and
different FileSystem schemes? For the same HDFS file, looks like the nnId URI
can be derived from:
# name service ID in HA or federation
# the detailed host:port of the current active NN
# URI with webhdfs scheme
# URI with hdfs scheme
Should we treat them as the same HdfsInodeId? Or maybe we always use name
service id for nnId?
> 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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