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https://issues.apache.org/jira/browse/SOLR-13700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909083#comment-16909083
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Jan Høydahl commented on SOLR-13700:
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{quote}Also, I just spotted that both {{AuditLoggerPlugin.initializeMetrics}}
and {{AuthenticationPlugin.initializeMetrics}}needlessly add metrics names to
{{metricNames}} - this is already done as a part of each respective metric
registration by using {{SolrInfoBean.this.registerName(name)}}.
{quote}
Can you file a new Jira for this one and I'll grab it? Don't remember which
class I used as template back then, but there may be other places to clean up
too.
> Race condition in initializing metrics for new security plugins when
> security.json is modified
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-13700
> URL: https://issues.apache.org/jira/browse/SOLR-13700
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Hoss Man
> Priority: Major
> Attachments: SOLR-13700.patch
>
>
> When new security plugins are initialized due to remote API requetss, there
> is a delay between "registering" the new plugins for use in methods like
> {{initializeAuthenticationPlugin()}} (by assigning them to CoreContainer's
> volatile {{this.authenticationPlugin}} variable) and when the
> {{initializeMetrics(..)}} method is called on these plugins, so that they
> continue to use the existing {{Metric}} instances as the plugins they are
> replacing.
> Because these security plugins maintain local refrences to these Metrics (and
> don't "get" them from the MetricRegisty everytime they need to {{inc()}}
> them) this means that there is short race condition situation such that
> during the window of time after a new plugin instance is put into use, but
> before {{initializeMetrics(..)}} is called on them, at these plugins are
> responsible for accepting/rejecting requests, and decisions in {{Metric}}
> instances that are not registered and subsequently get thrown away (and GCed)
> once the CoreContainer gets around to calling {{initializeMetrics(..)}} (and
> the plugin starts using the pre-existing metric objects)
> ----
> This has some noticible impacts on auth tests on CPU constrained jenkins
> machines (even after putting in place SOLR-13464 work arounds) that make
> assertions about the metrics recorded.
> In real world situations, the impact of this bug on users is minor: for a few
> micro/milli-seconds, requests may come in w/o being counted in the auth
> metrics -- which may also result in descrepencies between the auth metrics
> totals and the overall request metrics.
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