c0b15a8cbe
DPDK vhostuser mode (DPDK/vhu) means that when an instance is powered
off the port is deleted, and when an instance is powered on a port is
created. This means a reboot is functionally a super fast
delete-then-create. Neutron trunking mode in combination with DPDK/vhu
implements a trunk bridge for each tenant, and the ports for the
instances are created as subports of that bridge. The standard way a
trunk bridge works is that when all the subports are deleted, a thread
is spawned to delete the trunk bridge, because that is an expensive and
time-consuming operation. That means that if the port in question is
the only port on the trunk on that compute node, this happens:
1. The port is deleted
2. A thread is spawned to delete the trunk
3. The port is recreated
If the trunk is deleted after #3 happens then the instance has no
networking and is inaccessible; this is the scenario that was dealt with
in a previous change [1]. But there continue to be issues with errors
"RowNotFound: Cannot find Bridge with name=tbr-XXXXXXXX-X". What is
happening in this case is that the trunk is being deleted in the middle
of the execution of #3, so that it stops existing in the middle of the
port creation logic but before the port is actually recreated.
Since this is a timing issue between two different threads it's
difficult to stamp out entirely, but I think the best way to do it is to
add a slight delay in the trunk deletion thread, just a second or two.
That will give the port time to come back online and avoid the trunk
deletion entirely.
[1] https://review.opendev.org/623275
Related-Bug: #1869244
Change-Id: I36a98fe5da85da1f3a0315dd1a470f062de6f38b
(cherry picked from commit
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api-ref | ||
bin | ||
devstack | ||
doc | ||
etc | ||
neutron | ||
playbooks/legacy | ||
rally-jobs | ||
releasenotes | ||
tools | ||
.coveragerc | ||
.gitignore | ||
.gitreview | ||
.mailmap | ||
.pylintrc | ||
.stestr.conf | ||
.zuul.yaml | ||
CONTRIBUTING.rst | ||
HACKING.rst | ||
LICENSE | ||
README.rst | ||
TESTING.rst | ||
babel.cfg | ||
bindep.txt | ||
lower-constraints.txt | ||
requirements.txt | ||
setup.cfg | ||
setup.py | ||
test-requirements.txt | ||
tox.ini |
README.rst
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