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From "Ryan McKinley (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SOLR-3083) all JMX Mbeans are identified as java.lang.String even if numeric
Date Mon, 07 May 2012 16:36:52 GMT

     [ https://issues.apache.org/jira/browse/SOLR-3083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan McKinley reassigned SOLR-3083:
-----------------------------------

    Assignee: Ryan McKinley
    
> all JMX Mbeans are identified as java.lang.String even if numeric
> -----------------------------------------------------------------
>
>                 Key: SOLR-3083
>                 URL: https://issues.apache.org/jira/browse/SOLR-3083
>             Project: Solr
>          Issue Type: Bug
>          Components: SearchComponents - other
>    Affects Versions: 4.0
>            Reporter: Tagged Siteops
>            Assignee: Ryan McKinley
>            Priority: Minor
>              Labels: interoperability,, jmx, monitoring, statistics
>         Attachments: SOLR-3083-Made-JMX-Mbean-information-use-numeric-typ.patch, Screen
shot 2012-01-31 at 2.19.06 PM.png
>
>
> When trying to monitor our Solr instances with JMXtrans (https://github.com/lookfirst/jmxtrans),
we discovered that all the Mbeans were identifying themselves as java.lang.String.   This
breaks the GangliaWriter in JMXtrans because the software decides it's a string instead of
a numeric values and you can't graph a string.   Other software we are monitoring with JMXtrans
(e.g. Kafka) correctly identify their numeric values as numbers (doubles in this case).
> For example, avgTimePerRequest in Solr is identified as a string which makes no sense.
 This behavior makes Solr less interoperable with the rest of the Java ecosystem.
> The problem code is in JmxMonitoredMap.java
> NamedList dynamicStats = infoBean.getStatistics();
> if (dynamicStats != null) {
>   for (int i = 0; i < dynamicStats.size(); i++) {
>     String name = dynamicStats.getName(i);
>     if (!staticStats.contains(name))
>       attrInfoList.add(new MBeanAttributeInfo(dynamicStats.getName(i),
>               String.class.getName(), null, true, false, false));
>   }
> I will try to attach a screenshot. 
> Thanks for Solr!  We use the heck out of it, it's awesome.

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