lucene/solr/contrib/jaegertracer-configurator/README.md

Welcome to Apache Solr Jaeger Tracer Configurator

Apache Solr Jaeger Tracer Configurator (solr-jaegertracer) provides a way for you to expose Solr's tracing to Jaeger.

Setup Jaeger Tracer Configurator

Note that all library of solr-jaegertracer must be included in the classpath of all nodes then Jaeger tracer can be setup in solr.xml like this:

<tracerConfig name="tracerConfig" class="org.apache.solr.jaeger.JaegerTracerConfigurator">
  <str name="agentHost">localhost</str>
  <int name="agentPort">5775</int>
  <bool name="logSpans">true</bool>
  <int name="flushInterval">1000</int>
  <int name="maxQueueSize">10000</int>
</tracerConfig>

List of parameters for JaegerTracerConfigurator include:

Parameter	Type	Required	Default	Description
agentHost	string	Yes		The host of Jaeger backend
agentPort	int	Yes		The port of Jaeger port
logsSpans	bool	No	true	Whether the tracer should also log the spans
flushInterval	int	No	5000	The tracer's flush interval (ms)
maxQueueSize	int	No	10000	The tracer's maximum queue size

Other parameters which are not listed above can be configured using System Properties or Environment Variables. The full list are listed at Jaeger-README.

By default the sampling rate is 0.1%, this value can be changed by updating key samplePercentage of cluster properties. I.e: /admin/collections?action=CLUSTERPROP&name=propertyName&samplePercentage=100.