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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3453) HDFS does not use ClientProtocol in a backward-compatible way
Date Tue, 22 May 2012 19:31:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281167#comment-13281167
] 

Kihwal Lee commented on HDFS-3453:
----------------------------------

Manually ran test-patch
{noformat}
     [exec] -1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     -1 tests included.  The patch doesn't appear to include any new or modified
tests.
     [exec]                         Please justify why no tests are needed for this patch.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     -1 findbugs.  The patch appears to introduce 8 new Findbugs (version 1.3.9)
warnings.
{noformat}

* test : No test was added since there is no functional change within the build/release.
* findbugs : Contrary to the report, this change does not introduce any additional findbug
warnings.
                
> 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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