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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3453) HDFS does not use ClientProtocol in a backward-compatible way
Date Tue, 29 May 2012 13:59:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284819#comment-13284819
] 

Suresh Srinivas commented on HDFS-3453:
---------------------------------------

Finally got some time spend on this and understand the issue. This is a good change. 

+1 for the patch.

A small comment. Can add to the comment {{Make sure the regular create() is done through the
old create()}}, why this is being done. Say {{Ensure create() is done using old create() without
createFlag. This allows newer clients that support createFlag to be interop with older server
implementation that do not createFlag in create().}}
                
> HDFS does not use ClientProtocol in a backward-compatible way
> -------------------------------------------------------------
>
>                 Key: HDFS-3453
>                 URL: https://issues.apache.org/jira/browse/HDFS-3453
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 1.0.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 1.1.0
>
>         Attachments: hdfs-3453-branch-1.patch
>
>
> HDFS-617 was brought into branch-0.20-security/branch-1 to support non-recursive create,
along with HADOOP-6840 and HADOOP-6886. However, the changes in HDFS was done in an incompatible
way, making the client unusable against older clusters, even when plain old create() is called.
This is because DFS now internally calls create() through the newly introduced method. By
simply changing how the methods are wired internally, we can remove this limitation. We may
eventually switch back to the approach in HDFS-617 when the majority of users adopt branch-1
based releases.

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