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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2296) hbase shell: phantom columns show up from select command
Date Fri, 30 Nov 2007 04:31:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HADOOP-2296:
--------------------------

    Status: Patch Available  (was: In Progress)

> hbase shell: phantom columns show up from select command
> --------------------------------------------------------
>
>                 Key: HADOOP-2296
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2296
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.15.0
>            Reporter: Michael Bieniosek
>            Assignee: stack
>         Attachments: 2296.patch
>
>
> {code}
> Hbase> select * from hbase_test where row='2';
> +--------------------------------------+--------------------------------------+
> | Column                               | Cell                                 |
> +--------------------------------------+--------------------------------------+
> | test:a                               | a                                    |
> +--------------------------------------+--------------------------------------+
> | test:c                               | c                                    |
> +--------------------------------------+--------------------------------------+
> 2 row(s) in set (0.00 sec)
> Hbase> select * from hbase_test where row='1';
> +--------------------------------------+--------------------------------------+
> | Column                               | Cell                                 |
> +--------------------------------------+--------------------------------------+
> | test:a                               | a                                    |
> +--------------------------------------+--------------------------------------+
> | test:b                               | b                                    |
> +--------------------------------------+--------------------------------------+
> 2 row(s) in set (0.00 sec)
> Hbase> select * from hbase_test;          
> +-------------------------+-------------------------+-------------------------+
> | Row                     | Column                  | Cell                    |
> +-------------------------+-------------------------+-------------------------+
> | 1                       | test:a                  | a                       |
> +-------------------------+-------------------------+-------------------------+
> | 1                       | test:b                  | b                       |
> +-------------------------+-------------------------+-------------------------+
> | 2                       | test:a                  | a                       |
> +-------------------------+-------------------------+-------------------------+
> | 2                       | test:b                  | b                       |
> +-------------------------+-------------------------+-------------------------+
> | 2                       | test:c                  | c                       |
> +-------------------------+-------------------------+-------------------------+
> 5 row(s) in set (0.14 sec)
> {code}
> Note the phantom value for test:b in row 2.
> I looked at the code, and it looks like SelectCommand.scanPrint incorrectly fails to
call results.clear() every time it calls scan.next().  
> However, I also think that the HScannerInterface.next(HStoreKey key, SortedMap<Text,byte[]>
results) is confusing, since it requires the user to call results.clear() and key.clear()
before calling next each time.  Since the Iterable interface that provides the zero-arg next
has been added, I suggest that it might be worthwhile to deprecate the two-arg next.

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