Xtra Coder created KARAF-6610:
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Summary: Unstable initial startup of karaf
Key: KARAF-6610
URL: https://issues.apache.org/jira/browse/KARAF-6610
Project: Karaf
Issue Type: Bug
Components: karaf
Environment: OS: CentOS 7.7.1908
Java 11
Karaf 4.2.8 / 4.2.7
My application uses OSGI Declarative Services, ~50 various bundles.
Reporter: Xtra Coder
Attachments: 1-startup.txt, 2-manul-restart-of-bundles.txt
We have a problem with unstable initial startup of karaf. From time to time
startup fails because of some weird exceptions coming from karaf and felix.
Typically after 2nd or at most 3rd restart problem goes away.
I expect there is some race condition depending on CPU speed or something else.
That problem almost never occurs on powerful hardware workstations, but is
rather frequent on Virtual machines. Because of that issue we have special
startup script which retries in case of failures ... and this is somewhat odd.
Today I came across the problem that application under karaf fails to start
correctly all the time with any number of retries. After some additional
digging i have noticed that there is another process on virtual server which
consumes 100% of CPU and therefore ticks left to karaf are very limited.
To prove idea that karaf failures depend on timings - i killed those processes
and karaf started correctly.
After that i've started https://sourceforge.net/projects/systester
(./systester-cli -qcborwein 64M -threads 4 -bench) to consume entire CPU and
retried starting karaf – it failed.
I’m attaching exceptions I’ve got in the log. There are 2 of them
1. Initial startup
2. Admin console displayed all my bundlers as ‘Active’ (strange, but it
is) - I restarted few of them manually and got slightly different set of
exceptions
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