Andrzej Bialecki created SOLR-14914:
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Summary: Add option to disable metrics collection
Key: SOLR-14914
URL: https://issues.apache.org/jira/browse/SOLR-14914
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: metrics
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
Some users have expressed concerns about the overhead of metrics collection,
and consequently the need to have an option to turn off the metrics collection
altogether.
Metrics instrumentation in Solr cannot be itself easily removed or bypassed -
in order to provide fine-grained metrics many code paths had to be changed and
they now expect the metrics to be present (non-null). However, we can use the
mechanism of {{MetricSupplier}} to use no-op implementation of all metrics,
which would reduce the CPU overhead to basically the cost of an empty method
call, and the memory overhead to a HashMap entry in a {{MetricRegistry}}
(metric names still need to be tracked).
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