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From "Tagged Siteops (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-3083) all JMX Mbeans are identified as java.lang.String even if numeric
Date Wed, 01 Feb 2012 00:06:56 GMT
all JMX Mbeans are identified as java.lang.String even if numeric
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                 Key: SOLR-3083
                 URL: https://issues.apache.org/jira/browse/SOLR-3083
             Project: Solr
          Issue Type: Bug
          Components: SearchComponents - other
    Affects Versions: 3.5
            Reporter: Tagged Siteops
            Priority: Minor


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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