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From "Abhishek Singh Chouhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13347) RowCounter using special filter is broken
Date Tue, 14 Apr 2015 07:28:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493718#comment-14493718
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Abhishek Singh Chouhan commented on HBASE-13347:
------------------------------------------------

I was trying to figure out a case where this would give a wrong result.
As per the API doc  "Only Filter.filterKeyValue(Cell) is called AFTER all tests for ttl, column
match, deletes and max versions have been run."
Since we match the column before applying filter we would get correct row count irrespective
of the filter we use(FirstKeyOnlyFilter or FirstKeyValueMatchingQualifiersFilter) although
we might get the KV which does not have the column we specified as that might not be the first
column in the KVs for that row.But for row count that would not matter?
Also there is a test for row counter "testRowCounterHiddenColumn" that is passing with the
current code(giving the correct count).
I'm new to HBase codebase so might be interpreting things wrongly :)

> RowCounter using special filter is broken
> -----------------------------------------
>
>                 Key: HBASE-13347
>                 URL: https://issues.apache.org/jira/browse/HBASE-13347
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>    Affects Versions: 1.0.0
>            Reporter: Lars George
>             Fix For: 2.0.0, 1.1.0, 1.0.2
>
>
> The {{RowCounter}} in the {{mapreduce}} package is supposed to check if the row count
scan has a column selection added to it, and if so, use a different filter that finds the
row and counts it. But the {{qualifier.add()}} call is missing in the {{for}} loop. See https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/RowCounter.java#L165
> Needs fixing or row count might be wrong when using {{--range}}.



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