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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5912) org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes significant CPU
Date Wed, 02 May 2012 02:36:48 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-5912:
-------------------------------

    Status: Patch Available  (was: Open)
    
> 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
>         Attachments: hbase-5912.txt
>
>
> 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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