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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