[
https://issues.apache.org/jira/browse/HBASE-17644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865512#comment-15865512
]
Anoop Sam John commented on HBASE-17644:
----------------------------------------
Compare 2 BBCells seems the fastest though compare 2 KVs not that slower. The
diff is not that big. But when we get KVs in btw bulk of BBCells, the overall
write throughput goes down and the reason is the compare. Write path having
lots and lots of compare ops when it is getting added to CSLM.
> 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
> Components: regionserver
> Affects Versions: 2.0.0
> Reporter: ramkrishna.s.vasudevan
> Assignee: Anoop Sam John
> 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).
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
