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Posted to issues@hbase.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2012/05/02 04:36:48 UTC
[jira] [Commented] (HBASE-5912)
org.apache.hadoop.hbase.ipc.ProtocolSignature.getFingerprint takes
significant CPU
[ https://issues.apache.org/jira/browse/HBASE-5912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266303#comment-13266303 ]
Todd Lipcon commented on HBASE-5912:
------------------------------------
Adding a simple cache dropped the CPU time for my million-read workload on 0.94 from 1m40s to 1m30s, and improved average latency by a few % as well.
> 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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