Pierre Salagnac created SOLR-17340:
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Summary: Call to /solr/admin/info/system is abnormally slow
Key: SOLR-17340
URL: https://issues.apache.org/jira/browse/SOLR-17340
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 9.6
Reporter: Pierre Salagnac
Solr endpoint {{/solr/admin/info/system}} is used to return some generic system
metrics (memory, JVM...)
This endpoint is also used by {{solr-operator}} by default for start-up probe
and liveness probe. (details
[here|https://github.com/apache/solr-operator/blob/5fec11f8ef181a58b1f72123b44ae6532c49b62d/controllers/util/solr_security_util.go#L44]).
Very long runtime can cause failures of the probes.
Runtime is abnormally slow because of the time spent in introspecting beans to
create {{BeanInfo}} instances. Most of the time is spent here:
{code}
java.lang.Exception: Stack trace
at
java.desktop/java.beans.Introspector.getBeanInfo(Introspector.java:279)
at
org.apache.solr.util.stats.MetricUtils.addMXBeanMetrics(MetricUtils.java:777)
at
org.apache.solr.util.stats.MetricUtils.addMXBeanMetrics(MetricUtils.java:841)
at
org.apache.solr.handler.admin.SystemInfoHandler.getSystemInfo(SystemInfoHandler.java:223)
at
org.apache.solr.handler.admin.SystemInfoHandler.handleRequestBody(SystemInfoHandler.java:156)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:248)
at org.apache.solr.handler.admin.InfoHandler.handle(InfoHandler.java:96)
at
org.apache.solr.handler.admin.InfoHandler.handleRequestBody(InfoHandler.java:84)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:248)
{code}
There is no need to execute the bean introspection at each call. We could
lazily instantiate them and keep them in memory for efficiency.
Note: I haven't been able to figure out the exact cause, but the runtime can
exponentially increase under heady querying load.
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