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From "Nate McCall (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-14163) RateBasedBackPressure unnecessarily invokes a lock on the Guava RateLimiter
Date Thu, 11 Jan 2018 21:46:02 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-14163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nate McCall reassigned CASSANDRA-14163:
---------------------------------------

    Assignee: Nate McCall

> RateBasedBackPressure unnecessarily invokes a lock on the Guava RateLimiter 
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14163
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14163
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Nate McCall
>            Assignee: Nate McCall
>            Priority: Minor
>              Labels: lhf
>
> {{o.a.c.net.RateBasedBackPressure#apply}} calls {{getRate()}} on the underlying Guava
{{RateLimiter}} several times in quick succession (including as the argument to a non level
checked log statement). 
> Said {{getRate()}} method acquires a lock within {{RateLimiter}}, so just getting a local
variable reference will remove several calls and thus several lock acquisitions. 



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