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From "Gary Helmling (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5082) ColumnAggregationEndPoint- Causes null pointer in RS when we pass null column qualifier
Date Fri, 23 Dec 2011 21:36:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175587#comment-13175587
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Gary Helmling commented on HBASE-5082:
--------------------------------------

ColumnAggregationEndpoint is a test class that was created for use by TestClassLoading.  As
far as I'm aware, it wasn't intended to be a user-facing class or utility.  For that case
you would want to use the AggregateProtocol/AggregateImplementation coprocessor.

Maybe it would be better to just change ColumnAggregationEndpoint to default (package-private)
visibility so that it's clear people should not try to make use of it?
                
> ColumnAggregationEndPoint- Causes null pointer in RS when we pass null column qualifier
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-5082
>                 URL: https://issues.apache.org/jira/browse/HBASE-5082
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Priority: Minor
>
> I was trying to use the ColumnAggregationEndPoint.sum().
>  
> In my sample is just created a column family but did not use any qualifier and inserted
some data.
>  
> I tried to use  ColumnAggregationEndPoint.sum(qualifier, null).  When i did this inside
the ColumnAggregationEndPoint we do 
> scan.addColumn().  This is adding the [null] array in the scan object.  Later in the
scanQueryMatcher it is throwing nullpointer exception.  
> I can understand that addColumn() is to specifiy the qualifier.
> Do we need to document somewhere saying qualifier should not be null? I think coprocessors
can be used even in places where we don't have qualifiers. If that is the case this sample
ColumnAggregationEndPoint may not work.

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