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Date: Tue, 31 Jul 2012 06:00:37 +0000 (UTC)
From: "Shrijeet Paliwal (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6468) RowCounter may return incorrect
 result if column name is specified in command line
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    [ https://issues.apache.org/jira/browse/HBASE-6468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425548#comment-13425548 ] 

Shrijeet Paliwal commented on HBASE-6468:
-----------------------------------------

{quote}
FirstKeyValueMatchingQualifiersFilter -> When a CF contains qualifier a,b,c and the qualifiers provided are b and c, what will happen to the KVs for qualifier 'a' ? Will this be included in the Result? Is this expected?
{quote}
Depends on whether or not first KV matching any of the columns associated with filter have been seen yet or not. 

{quote}
Can the qualifiers be accommodated in FirstKeyOnlyFilter only? Do we need a new Filter? Just a though from my side.
By default FirstKeyOnlyFilter allow only the 1st KV (from all the qualifiers) from a CF to come in the Result and will filter out other KVs.
Specifying a set of qualifiers to FirstKeyOnlyFilter will restrict the selection of the 1st KV from a any of these qualifiers only. It will filter out all KVs from other qualifiers.
{quote}
FKVMatchingQualifiersFilter has a peculiar behavior hence (extending it from FirstKeyOnlyFilter and) creating a new filter made sense. 
                
> RowCounter may return incorrect result if column name is specified in command line
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-6468
>                 URL: https://issues.apache.org/jira/browse/HBASE-6468
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.5
>            Reporter: Shrijeet Paliwal
>         Attachments: 0001-HBASE-6468-RowCounter-may-return-incorrect-result.patch, 0002-HBASE-6468-RowCounter-may-return-incorrect-result.patch
>
>
> The RowCounter use FirstKeyOnlyFilter regardless of whether or not the
> command line argument specified a column family (or family:qualifier).
> In case when no qualifier was specified as argument, the scan will
> give correct result. However in the other case the scan instance may
> have been set with columns other than the very first column in the
> row, causing scan to get nothing as the FirstKeyOnlyFilter removes
> everything else.
> https://issues.apache.org/jira/browse/HBASE-6042 is related. 

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