Hi, Han,
I do not encounter that problem these days after using this
patch. I think there is no COMPACT in my environment. Actaully , I don't see
any snap file in /var/lib/openvswitch.
Thanks,
Yun
At 2019-12-04 10:01:16, "Han Zhou" <hz...@ovn.org> wrote:
Hi,
Could you see if this patch fixes your problem?
https://patchwork.ozlabs.org/patch/1203951/
Thanks,
Han
On Mon, Dec 2, 2019 at 12:28 AM Han Zhou <hz...@ovn.org> wrote:
Sorry for the late reply. It was holiday here.
I didn't see such problem when there is no compaction. Did you see this problem
when DB compaction didn't happen? The difference is that after compaction the
RAFT log doesn't have any entries and all the data is in the snapshot.
On Fri, Nov 29, 2019 at 12:11 AM taoyunupt <taoyun...@126.com> wrote:
Hi,Han
Hope to receive your reply.
Thanks,
Yun
在 2019-11-28 16:17:07，"taoyunupt" <taoyun...@126.com> 写道：
Hi,Han
Another question. NO COMPACT. If restart a follower , leader sender
some entries during the break time, when it has started, if it also happend to
this problem? What is the difference between simply restart and COMPACT with
restart ?
Thanks,
Yun
在 2019-11-28 13:58:36，"taoyunupt" <taoyun...@126.com> 写道：
Hi,Han
Thanks for your reply. I think maybe we can disconnect the failed
follower from the Haproxy then synchronize the date, after all completed,
reconnect it to Haproxy again. But I do not know how to synchronize actually.
It is just my naive idea. Do you have some suggestion about how to fix
this problem. If not very completed, I wii have a try.
Thanks
Yun
在 2019-11-28 11:47:55，"Han Zhou" <hz...@ovn.org> 写道：
On Wed, Nov 27, 2019 at 7:22 PM taoyunupt <taoyun...@126.com> wrote:
>
> Hi,
> My OVN cluster has 3 OVN-northd nodes, They are proxied by Haproxy with a
> VIP. Recently, I restart OVN cluster frequently. One of the members report
> the logs below.
> After read the code and paper of RAFT, it seems normal process ,If the
> follower does not find an entry in its log with the same index and term, then
> it refuses the new entries.
> I think it's reasonable to refuse. But, as we could not control Haproxy
> or some proxy maybe, so it will happen error when an session assignate to the
> failed follower.
>
> Does have some means or ways to solve this problem. Maybe we can kick off
> the failed follower or disconnect it from the haproxy then synchronize the
> date ? Hope to hear your suggestion.
>
>
> 2019-11-27T14:22:17.060Z|00240|raft|INFO|rejecting append_request because
> previous entry 1103,50975 not in local log (mismatch past end of log)
> 2019-11-27T14:22:17.064Z|00241|raft|ERR|Dropped 34 log messages in last 12
> seconds (most recently, 0 seconds ago) due to excessive rate
> 2019-11-27T14:22:17.064Z|00242|raft|ERR|internal error: deferred append_reply
> message completed but not ready to send because message index 14890 is past
> last synced index 0: a2b2 append_reply "mismatch past end of log": term=1103
> log_end=14891 result="inconsistency"
> 2019-11-27T14:22:17.402Z|00243|raft|INFO|rejecting append_request because
> previous entry 1103,50975 not in local log (mismatch past end of log)
>
>
> [root@ovn1 ~]# ovs-appctl -t /var/run/openvswitch/ovnsb_db.ctl
> cluster/status OVN_Southbound
> a2b2
> Name: OVN_Southbound
> Cluster ID: 4c54 (4c546513-77e3-4602-b211-2e200014ad79)
> Server ID: a2b2 (a2b2a9c5-cf58-4724-8421-88fd5ca5d94d)
> Address: tcp:10.254.8.209:6644
> Status: cluster member
> Role: leader
> Term: 1103
> Leader: self
> Vote: self
>
> Log: [42052, 51009]
> Entries not yet committed: 0
> Entries not yet applied: 0
> Connections: ->beaf ->9a33 <-9a33 <-beaf
> Servers:
> a2b2 (a2b2 at tcp:10.254.8.209:6644) (self) next_index=15199
> match_index=51008
> beaf (beaf at tcp:10.254.8.208:6644) next_index=51009 match_index=0
> 9a33 (9a33 at tcp:10.254.8.210:6644) next_index=51009 match_index=51008
>
I think it is a bug. I noticed that this problem happens when the cluster is
restarted after DB compaction. I mentioned it in one of the test cases:
https://github.com/openvswitch/ovs/blob/master/tests/ovsdb-cluster.at#L252
I also mentioned another problem related to compaction:
https://github.com/openvswitch/ovs/blob/master/tests/ovsdb-cluster.at#L239
I was planning to debug these but didn't get the time yet. I will try to find
some time next week (it would be great if you could figure it out and submit
patches).
Thanks,
Han
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