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https://issues.apache.org/jira/browse/AMQ-9107?focusedWorklogId=817291&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-817291
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ASF GitHub Bot logged work on AMQ-9107:
---------------------------------------
Author: ASF GitHub Bot
Created on: 15/Oct/22 16:32
Start Date: 15/Oct/22 16:32
Worklog Time Spent: 10m
Work Description: lucastetreault commented on PR #908:
URL: https://github.com/apache/activemq/pull/908#issuecomment-1279778668
I created [AMQ-9123](https://issues.apache.org/jira/browse/AMQ-9123) to
follow up on clearing the collections when the broker is stopped. I'll make the
changes soon and run all the tests to make sure things are still behaving as
expected.
Issue Time Tracking
-------------------
Worklog Id: (was: 817291)
Time Spent: 1h 50m (was: 1h 40m)
> Closing many consumers causes CPU to spike to 100%
> --------------------------------------------------
>
> Key: AMQ-9107
> URL: https://issues.apache.org/jira/browse/AMQ-9107
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.17.1, 5.16.5
> Reporter: Lucas Tétreault
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 5.18.0, 5.16.6, 5.17.3
>
> Attachments: example.zip, image-2022-10-07-00-12-39-657.png,
> image-2022-10-07-00-17-30-657.png
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> When there are many consumers (~188k) on a queue, closing them is incredibly
> expensive and causes the CPU to spike to 100% while the consumers are closed.
> Tested on an Amazon MQ mq.m5.large instance (2 vcpu, 8gb memory).
> I have attached a minimal recreation of the issue where the following
> happens:
> 1/ Open 100 connections.
> 2/ Create consumers as fast as we can on all of those connections until we
> hit at least 188k consumers.
> 3/ Sleep for 5 minutes so we can observe the CPU come back down after opening
> all those connections.
> 4/ Start closing consumers as fast as we can.
> 5/ After all consumers are closed, sleep for 5 minutes to observe the CPU
> come back down after closing all the connections.
>
> In this example it seems 5 minutes wasn't actually sufficient time for the
> CPU to come back down and the consumer and connection counts seem to hit 0 at
> the same time:
> !image-2022-10-07-00-12-39-657.png|width=757,height=353!
>
> In a previous test with more time sleeping after closing all the consumers we
> can see the CPU come back down before we close the connections.
> !image-2022-10-07-00-17-30-657.png|width=764,height=348!
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