Fix smartproxy worker heartbeat thread #19816
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The heartbeat worker thread and the main thread were competing to define the Workers::MiqDefaults constant. The main thread calls heartbeat from do_work_loop which is unavoidable. So to solve the problem we just wait until the first call to do_work to start the heartbeat worker. This allows the main thread to resolve the constant without contention and the heartbeat worker still gets started before we process the first queue message Fixes ManageIQ#19813
carbonin
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Feb 5, 2020
carbonin
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jerryk55
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Feb 6, 2020
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@miq-bot add_label smartstate |
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@jerryk55 Cannot apply the following label because they are not recognized: smartstate |
Previously this could call join on a nil. Now that ruby 2.5 logs exceptions raised in threads by default we don't have to worry about joining the thread to re-raise. Instead we can just kill the thread if it's aborting and restart it if it is exited (cleanly or not).
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Checked commits carbonin/manageiq@5a1eb86~...8399786 with ruby 2.5.5, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0 app/models/miq_smart_proxy_worker/runner.rb
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jrafanie
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| # if the thread is dead, start a new one and kill it if it is aborting | ||
| if !@tid.alive? | ||
| @tid.kill if @tid.status == "aborting" |
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It's amazing how much easier this is to grok by splitting apart that conditional into two conditional checks.
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The heartbeat worker thread and the main thread were competing
to define the
Workers::MiqDefaultsconstant.The main thread calls heartbeat from
do_work_loopwhich isunavoidable. So to solve the problem we just wait until the first
call to
do_workto start the heartbeat worker.This allows the main thread to resolve the constant without contention
and the heartbeat worker still gets started before we process the
first queue message
Fixes #19813