[ https://issues.apache.org/jira/browse/HDFS-487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HDFS-487:
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Attachment: fileid1.txt
This patch implements a 64 bit fileid per file. It uses the already existing generation stamp
counter to populate this field.
One major question that is unanswered by this patch: what to do with files that were created
by older versions of hadoop. I think a good answer will be assign them unique fileids.
> HDFS should expose a fileid to uniquely identify a file
> -------------------------------------------------------
>
> Key: HDFS-487
> URL: https://issues.apache.org/jira/browse/HDFS-487
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: fileid1.txt
>
>
> HDFS should expose a id that uniquely identifies a file. This helps in developing applications
that work correctly even when files are moved from one directory to another. A typical use-case
is to make the Pluggable Block Placement Policy (HDFS-385) use fileid instead of filename.
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