Github user marcaurele commented on the issue:
https://github.com/apache/cloudstack/pull/2027
@rhtyd I found one issue with the test and `NioConnection` class. This kind
of intermittent problem are always hard to search for a root cause, but after
lots of logging I finally found why. I updated the PR with the change.
If the main thread running the test is stopped there
https://github.com/apache/cloudstack/blob/master/utils/src/main/java/com/cloud/utils/nio/NioConnection.java#L102
due to context switching, the flag `_isRunning` isn't switched to True by the
time the NioServer connection handler start it's call loop, and it exits on the
`while(_isRunning)`
https://github.com/apache/cloudstack/blob/master/utils/src/main/java/com/cloud/utils/nio/NioConnection.java#L125
directly. Therefore the server isn't listening at all and the connection
cannot be made. The flag `_isRunning` must be turned `true` before submitting
the task/thread.
I still digging into Nio thread handler as we are experiencing some problem
in production when quite a few agents try to connect at the same time to a
management server. None of them can connect.
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