[jira] [Updated] (SOLR-14914) Add option to disable metrics collection

["Andrzej Bialecki (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-14914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrzej Bialecki updated SOLR-14914:
------------------------------------
    Fix Version/s: master (9.0)

> 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
>            Priority: Major
>             Fix For: master (9.0)
>
>
> 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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