** Changed in: vmware-nsx
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1420278
Title:
API workers might not work when sync thread is enabled
Status in neutron:
Invalid
Status in neutron icehouse series:
New
Status in neutron juno series:
New
Status in vmware-nsx:
Fix Released
Bug description:
API workers are started with a fork().
It is well known that this operation uses CoW on the child process - and this
should not constitute a problem.
However, the status synch thread is started at plugin initialization and
might be already running when the API workers are forked.
The NSX API client, extensively used by this thread, uses an eventlet
semaphore to grab backend connections from a pool.
It is therefore possible that when a worker process is forked it receives
semaphore which are in "busy" state. Once forked these semaphores are new
objects, and they will never be unblocked. The API worker therefore simply
hangs.
This behaviour has been confirmed by observation on the field
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