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https://issues.apache.org/jira/browse/HBASE-5912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-5912.
--------------------------
Resolution: Invalid
Resovling as no longer valid. We don't do protocol signature anymore (the
unimplemented notion that if signatures didn't match, we'd volunteer some other
protocol has all been stripped out). In fact all reflection has been undone
from ipc.
> 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/RPC, 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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