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https://issues.apache.org/jira/browse/HTTPCLIENT-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCLIENT-1809.
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Resolution: Duplicate
Duplicate of HTTPCORE-390.
Oleg
> Thread contention in PoolingHttpClientConnectionManager
> -------------------------------------------------------
>
> Key: HTTPCLIENT-1809
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1809
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.5
> Reporter: Andrew Shore
> Priority: Minor
> Labels: perfomance
>
> We (AWS SDK for Java) have been investigating reports of poor performance in
> the SDK and have narrowed it down to thread contention issues in
> PoolingHttpClientConnectionManager. Up to a certain TPS, performance is great
> and their is no issue. After a certain TPS (approx 8000 in our load tests),
> performance tanks hard and most threads end up stuck waiting on a lock in
> AbstractConnPool (in either lease or releaseConnection).
> https://github.com/apache/httpcore/blob/4.4.x/httpcore/src/main/java/org/apache/http/pool/AbstractConnPool.java#L403
> This quickly locks up the application as it tries to meet the incoming TPS.
> We have been able to workaround this and achieve much higher throughput but
> having multiple SDK clients and round robin selecting them to hand off to
> threads. This allowed us to easily scale up to 16, 000 TPS. We wanted to open
> up a dialog with the maintainers of the Apache HTTP client to see if this is
> a known issue/limitation and what options we have for getting around it. We
> aren’t opposed to re-implementing the connection manager to be more
> performant but since it’s a pretty sizable chunk of work we wanted to ensure
> that’s the best path forward before proceeding.
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