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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-4041) Java reflection eats too much CPU
Date Thu, 05 Nov 2015 22:16:27 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Newton updated ACCUMULO-4041:
----------------------------------
    Fix Version/s: 1.8.0
                   1.7.1
           Status: Patch Available  (was: Open)

Proposed patch. Could also cache the lookup in SiteConfiguration, too. I hope I don't have
to so this for all the different annotations.

Patch is against master, but I can back-port it and move it up.


> Java reflection eats too much CPU
> ---------------------------------
>
>                 Key: ACCUMULO-4041
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4041
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.7.0
>         Environment: Ubuntu 15.10, jdk1.8.0_60
>            Reporter: Volth
>            Assignee: Eric Newton
>             Fix For: 1.7.1, 1.8.0
>
>         Attachments: ACCUMULO-4041-01.patch, profiling.jpg
>
>
> This is called so many times that it eats too much CPU, even more than the snappy compressor:
http://i.imgur.com/vqX4pFi.png
> Perhaps the annotation data should be copied into regular variables which can be accessed
without reflection.
> - org.apache.accumulo.core.client.impl.Tables.getZooCache()
>   - org.apache.accumulo.server.client.HdfsZooInstance.getZooKeepersSessionTimeOut()
>     - org.apache.accumulo.core.conf.AccumuloConfiguration.getTimeInMillis()
>       - org.apache.accumulo.core.conf.SiteConfiguration.get()
>         - org.apache.accumulo.core.conf.Property.isSensitive()
>           - org.apache.accumulo.core.conf.Property.hasAnnotation()
>             - java.lang.Class.getField()	



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