Appy created HBASE-18542:

             Summary: [HLC] Performance microbenchmarks
                 Key: HBASE-18542
             Project: HBase
          Issue Type: Sub-task
            Reporter: Appy

Need tests to benchmark performance of Clock#now() and update() functions (for 
all types of clocks).
If update() is too costly, we can do optimizations in 
ExecuteProceduresRemoteCall#call() and other places where we call update() in 
loop. Instead, it might be faster to calculate max timestamp in loop and call 
update() just once.

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