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https://issues.apache.org/jira/browse/HBASE-17644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anoop Sam John updated HBASE-17644:
-----------------------------------
    Attachment: HBASE-17644_V2.patch

Fixed test failure.  Those because of typecasting into KVs.  Renamed 
TestOffheapKeyValue also as per the class name change

> Always create ByteBufferCells after copying to MSLAB
> ----------------------------------------------------
>
>                 Key: HBASE-17644
>                 URL: https://issues.apache.org/jira/browse/HBASE-17644
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17644.patch, HBASE-17644_V2.patch
>
>
> We create a cell out of the Bytebuffer that is returned by MSLAB. This BB can 
> be offheap or onheap type. If MSLAB is full we return onheap byte buffer. So 
> the place where we create a cell by copying data to this buffer we either 
> create KeyValue or OffheapKV based on the buffer type. So what we saw in 
> tests is that since we have a combination of Cells the comparisons that 
> happens when adding to memstore happens millions of times and that has an 
> impact on the performance of write path. In read path this is not significant 
> enougth (though we have plans to just create one type of cells every where in 
> Server side). 



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