Heng Chen commented on HBASE-16652:

Found the reason why 'get' in Increment is slower than append. 

That is due to 'TimeRange' in Increment,  if we not set it,  the default value 
is [0, Long.MaxValue], so get in increment will be slower. 

IMO the default value about tr should be null if we not set it explicitly. 
Upload a patch.  And with the patch,  'get' in increment is faster now.  

Results shows below:

w/o the patch of increment:  55693ns,  57180ns,  56374ns
w the patch of increment: 52358ns, 50146ns, 48047.2ns

> Figure out performance difference between increment and append
> --------------------------------------------------------------
>                 Key: HBASE-16652
>                 URL: https://issues.apache.org/jira/browse/HBASE-16652
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Heng Chen
>              Labels: performance
>         Attachments: append.jfr, append_get_profile.png, increment.jfr, 
> increment_get_profile.png
> When do performance test in HBASE-16625,  i found it has the very big 
> difference between Append and Increment (append is about 37% faster than 
> increment).
> As [~stack] mentioned in 
> https://issues.apache.org/jira/browse/HBASE-16610?focusedCommentId=15493166&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15493166,
>    append and increment has been unified in server-side,  and they looks the 
> same in client-side. 
> This issue is to figure out why the performance looks different between them.

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