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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17644) Create ByteBuffered cells only while creating a cell from MSLAB
Date Tue, 14 Feb 2017 05:25:41 GMT
ramkrishna.s.vasudevan created HBASE-17644:
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             Summary: Create ByteBuffered cells only while creating a cell from MSLAB
                 Key: HBASE-17644
                 URL: https://issues.apache.org/jira/browse/HBASE-17644
             Project: HBase
          Issue Type: Sub-task
    Affects Versions: 2.0.0
            Reporter: ramkrishna.s.vasudevan
             Fix For: 2.0.0


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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