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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4489) Use InodeID as as an identifier of a file in HDFS protocols and APIs
Date Wed, 27 Mar 2013 01:57:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614802#comment-13614802
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Suresh Srinivas commented on HDFS-4489:
---------------------------------------

One more thing I forgot to add. There are many optimizations that are possible to reduce the
memory consumed. It comes at the cost of code complexity and not so clean abstractions. I
would rather avoid it and go for additional memory given newer machines are coming with more
memory, than make the code unclean.
                
> Use InodeID as as an identifier of a file in HDFS protocols and APIs
> --------------------------------------------------------------------
>
>                 Key: HDFS-4489
>                 URL: https://issues.apache.org/jira/browse/HDFS-4489
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>
> The benefit of using InodeID to uniquely identify a file can be multiple folds. Here
are a few of them:
> 1. uniquely identify a file cross rename, related JIRAs include HDFS-4258, HDFS-4437.
> 2. modification checks in tools like distcp. Since a file could have been replaced or
renamed to, the file name and size combination is no t reliable, but the combination of file
id and size is unique.
> 3. id based protocol support (e.g., NFS)
> 4. to make the pluggable block placement policy use fileid instead of filename (HDFS-385).

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