chenxu created HBASE-22905:
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             Summary: Avoid temp ByteBuffer allocation in 
BlockingRpcConnection#writeRequest
                 Key: HBASE-22905
                 URL: https://issues.apache.org/jira/browse/HBASE-22905
             Project: HBase
          Issue Type: Bug
            Reporter: chenxu


Currently BlockingRpcConnection use ByteBufferOutputStream to serialize 
CellBlock which involve temp ByteBuffer allocation, we can replace it with 
netty’s ByteBufOutputStream, just like what NettyRpcDuplexHandler#writeRequest 
doing



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