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https://issues.apache.org/jira/browse/HBASE-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252744#comment-13252744
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stack commented on HBASE-3443:
------------------------------

Oh, and if you don't fix it, you'll have to explain why you didn't to BenoƮt.
                
> ICV optimization to look in memstore first and then store files (HBASE-3082) 
> does not work when deletes are in the mix
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3443
>                 URL: https://issues.apache.org/jira/browse/HBASE-3443
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.0, 0.90.1, 0.90.2, 0.90.3, 0.90.4, 0.90.5, 0.90.6, 
> 0.92.0, 0.92.1
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Lars Hofhansl
>            Priority: Critical
>              Labels: corruption
>             Fix For: 0.96.0
>
>         Attachments: 3443.txt
>
>
> For incrementColumnValue() HBASE-3082 adds an optimization to check memstores 
> first, and only if not present in the memstore then check the store files. In 
> the presence of deletes, the above optimization is not reliable.
> If the column is marked as deleted in the memstore, one should not look 
> further into the store files. But currently, the code does so.
> Sample test code outline:
> {code}
> admin.createTable(desc)
> table = HTable.new(conf, tableName)
> table.incrementColumnValue(Bytes.toBytes("row"), cf1name, 
> Bytes.toBytes("column"), 5);
> admin.flush(tableName)
> sleep(2)
> del = Delete.new(Bytes.toBytes("row"))
> table.delete(del)
> table.incrementColumnValue(Bytes.toBytes("row"), cf1name, 
> Bytes.toBytes("column"), 5);
> get = Get.new(Bytes.toBytes("row"))
> keyValues = table.get(get).raw()
> keyValues.each do |keyValue|
>   puts "Expect 5; Got Value=#{Bytes.toLong(keyValue.getValue())}";
> end
> {code}
> The above prints:
> {code}
> Expect 5; Got Value=10
> {code}

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