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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7878) API - expose an unique file identifier
Date Fri, 10 Apr 2015 00:27:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14488619#comment-14488619
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Sergey Shelukhin commented on HDFS-7878:
----------------------------------------

1-2) I can replace with nullable, but it seems that it's cleaner to have hasFile/getFile.
Either way works.
3) It is a public API. See comment above from [~jingzhao] - the intent is to get file ID and
open files by file ID, so there needs to be an utility method to get file ID based path
4) What kind of testing? It adds a field.

> 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
>         Attachments: HDFS-7878.01.patch, HDFS-7878.02.patch, HDFS-7878.03.patch, HDFS-7878.04.patch,
HDFS-7878.05.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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