This problem seems to affect focal-xena as well according to lp bug
#1996594, can we also nominate it to focal and xena?
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https://bugs.launchpad.net/bugs/1990978
Title:
Raft bug: OVSDB leadership transfers every 10-20 min after initial
compaction
Status in Ubuntu Cloud Archive:
New
Status in Ubuntu Cloud Archive yoga series:
New
Status in openvswitch package in Ubuntu:
Confirmed
Status in openvswitch source package in Focal:
New
Status in openvswitch source package in Jammy:
Confirmed
Status in openvswitch source package in Kinetic:
Confirmed
Bug description:
First compaction starts after 24 hours, or earlier after doubling of
DB size.
Subsequent compactions will trigger every 10-20 min.
The OVS version hitting this issue:
ovs-vsctl (Open vSwitch) 2.17.2
Commit ID that fixes the issue is:
https://github.com/openvswitch/ovs/commit/a32a4e1fa2d3fad284834d4b7bccc2e71d33f9da
https://github.com/openvswitch/ovs/commit/dfc3e65c8191f5dc375337c23aed128b5c0d7781
(2.17 branch patch)
Reproducer:
Trigger compactions by using command line tool:
ovs-appctl -t /var/run/ovn/ovnsb_db.ctl ovsdb-server/compact
or by creating DB pressure, i.e.:
#!/bin/bash
for i in {1..5000}
do
ovn-nbctl ls-add sw$i
if [[ $? -ne 0 ]] ; then
echo "Failed on ls-add i: $i"
exit 1
fi
for j in {1..2000}
do
echo "Iteration i: $i and j:$j"
ovn-nbctl lsp-add sw$i sw$i$j
if [[ $? -ne 0 ]] ; then
echo "Failed on lsp-add i: $i and j: $j"
exit 1
fi
done
done
for i in {1..5000}
do
echo "Delete iteration i: $i"
ovn-nbctl ls-del sw$i
if [[ $? -ne 0 ]] ; then
echo "Failed on ls-del i: $i"
exit 1
fi
done
Check for leadership transfers using:
sudo grep "Transferring leadership" /var/log/ovn/ov* | grep
ovsdb-server-sb.log
There should be a new entry every 10-20min.
=== Ubuntu SRU Details ===
[Impact]
Please see above
[Test Case]
* deploy Openstack Yoga
* connect to the NB DB leader and run the script to generate DB pressure.
Compaction will occur after the DB doubles its size
* check for subsequent transfers after one hour using the following script:
sudo grep "Transferring leadership" /var/log/ovn/ov* | grep
ovsdb-server-sb.log
[Where things could go wrong]
Regression is not expected since it reduces the frequency of transfers.
The fix has also been applied upstream
https://github.com/openvswitch/ovs/commit/dfc3e65c8191f5dc375337c23aed128b5c0d778
however a new version has not been released.
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https://bugs.launchpad.net/cloud-archive/+bug/1990978/+subscriptions
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