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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5912) org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes significant CPU
Date Wed, 02 May 2012 02:30:48 GMT
Todd Lipcon created HBASE-5912:
----------------------------------

             Summary: org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes significant
CPU
                 Key: HBASE-5912
                 URL: https://issues.apache.org/jira/browse/HBASE-5912
             Project: HBase
          Issue Type: Improvement
          Components: ipc, performance
    Affects Versions: 0.94.1
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


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.

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