huaxiang sun commented on HBASE-20710:

If this is the case, I will upload a new patch which is a minor update based on 
the patch you have [~stack]. It is going to help the case when the cell is 
IndividualBytesFieldCell. I will put a new patch shortly.

> extra cloneFamily() in Mutation.add(Cell)
> -----------------------------------------
>                 Key: HBASE-20710
>                 URL: https://issues.apache.org/jira/browse/HBASE-20710
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>    Affects Versions: 2.0.1
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>            Priority: Minor
>             Fix For: 2.0.1
>         Attachments: HBASE-20710-master-v001.patch
> The cpu profiling shows that during PE randomWrite testing, about 1 percent 
> of time is spent in cloneFamily. Reviewing code found that when a cell is DBB 
> backed ByteBuffKeyValueCell (which is default with Netty Rpc), 
> cell.getFamilyArray() will call cloneFamily() and there is again a 
> cloneFamily() in the following line of the code. since this is the critical 
> write path processing, this needs to be optimized.
> https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Mutation.java#L791
> https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Mutation.java#L795

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