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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5939) WebHdfs returns misleading error code and logs nothing if trying to create a file with no DNs in cluster
Date Wed, 19 Feb 2014 23:50:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906309#comment-13906309
] 

Yongjun Zhang commented on HDFS-5939:
-------------------------------------

Hi [~szetszwo], thanks for looking at it further. 

Given that the chooseRandom method already does
{code}
    if (scope.startsWith(excludedScope)) {
       return null;
    }
{code}
in the beginning, which returns null when "excludedScope" is super set of "scope", and your
analysis/observation above for later part of the method that it's possible for numOfDatanode
to have value 0. So returning null when numOfDatanode is 0 is consistent with the above piece
of code.

Based on this info, do you guys agree that my submitted patch is valid? 

Thanks.





> WebHdfs returns misleading error code and logs nothing if trying to create a file with
no DNs in cluster
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5939
>                 URL: https://issues.apache.org/jira/browse/HDFS-5939
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.3.0
>            Reporter: Yongjun Zhang
>            Assignee: Yongjun Zhang
>         Attachments: HDFS-5939.001.patch
>
>
> When trying to access hdfs via webhdfs, and when datanode is dead, user will see an exception
below without any clue that it's caused by dead datanode:
> $ curl -i -X PUT ".../webhdfs/v1/t1?op=CREATE&user.name=<userName>&overwrite=false"
> ...
> {"RemoteException":{"exception":"IllegalArgumentException","javaClassName":"java.lang.IllegalArgumentException","message":"n
must be positive"}}
> Need to fix the report to give user hint about dead datanode.



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