[jira] [Resolved] (AMQ-6505) Auto transports can lead to high cpu usage and failed connections under high load

["Christopher L. Shannon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-6505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christopher L. Shannon resolved AMQ-6505.
-----------------------------------------
       Resolution: Fixed
    Fix Version/s: 5.14.2
                   5.15.0

> Auto transports can lead to high cpu usage and failed connections under high load
> ---------------------------------------------------------------------------------
>
>                 Key: AMQ-6505
>                 URL: https://issues.apache.org/jira/browse/AMQ-6505
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.14.1
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>             Fix For: 5.15.0, 5.14.2
>
>
> There's an issue with the auto transports that can cause failed connections and very high cpu usage when there is a high number of concurrent connections attempted at the same time.  I noticed this primarily under load testing the auto+nio+ssl transport.  After some debugging, it turns out the issue is the ByteBuffer that is used to capture the initial bytes for protocol detection. The buffer should be local per thread and not shared but by mistake it was made a class level variable so under high load and contention the buffer can be manipulated by more than one thread causing failures and high cpu load (especially under NIO)



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