[HBASE-5912] org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes significant CPU

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 0.94.1
• Component/s: IPC/RPC, Performance
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 02/May/12 02:29
• Updated: 13/Jun/22 16:33
• Resolved: 04/May/13 23:40

Description

I ran oprofile on a YCSB client and found that a large percentage of the CPU time was going to this function:

51991 0.4913 25361.jo java java.lang.reflect.Method[] java.lang.Class.copyMethods(java.lang.reflect.Method[])
51384 0.4856 25361.jo java int org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint(java.lang.reflect.Method)
50428 0.4766 25361.jo java void java.util.Arrays.sort1(int[], int, int)

We should introduce a simple cache to avoid this overhead.