ramkrishna.s.vasudevan created HBASE-16859:

             Summary: Use Bytebuffer pool for non PB clients specifically for 
                 Key: HBASE-16859
                 URL: https://issues.apache.org/jira/browse/HBASE-16859
             Project: HBase
          Issue Type: Sub-task
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan
             Fix For: 2.0.0

In case of non PB clients we still write the results and header into a on 
demand  byte[]. This can be changed to use the BBPool (onheap or offheap 
But the basic problem is to identify if the response is for scans/gets. 
- One easy way to do it is use the MethodDescriptor per Call and use the   name 
of the MethodDescriptor to identify it is a scan/get. But this will pollute 
RpcServer by checking for scan/get type response.
- Other way is always set the result to cellScanner but we know that 
isClientCellBlockSupported is going to false for non PB clients. So ignore the 
cellscanner and go ahead with the results in PB. But this is not clean
- third one is that we already have a RpccallContext being passed to the RS. In 
case of scan/gets/multiGets we already set a Rpccallback for shipped call. So 
here on response we can check if the callback is not null and check for 
isclientBlockSupported. In this case we can get the BB from the pool and write 
the result and header to that BB. May be this looks clean?

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