[jira] [Updated] (HDFS-7878) API - expose a unique file identifier

["Chris Douglas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Douglas updated HDFS-7878:
--------------------------------
    Summary: API - expose a unique file identifier  (was: API - expose an unique file identifier)

> API - expose a 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-7878.07.patch, HDFS-7878.08.patch, HDFS-7878.09.patch, HDFS-7878.10.patch, HDFS-7878.11.patch, HDFS-7878.12.patch, HDFS-7878.13.patch, HDFS-7878.14.patch, HDFS-7878.15.patch, HDFS-7878.16.patch, HDFS-7878.17.patch, HDFS-7878.18.patch, HDFS-7878.19.patch, HDFS-7878.20.patch, HDFS-7878.21.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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