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| zhouhan | avishnoi: the reason is the timer impacts leader election timeout. If it is changed dramatically, the current heart-beat can get timed-out while the timer is being propagated to the followers, and unnecessary disturbance in the cluster will be triggered. | 00:47 |
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| avishnoi | zhouhan: but won’t master commit the change last, before propogating it to the followers? | 00:51 |
| zhouhan | avishnoi: yes, leader always applies the change first. So if you are enlarging the timer very long, follower may still expecting a short timeout, but leader may started waiting for a long time to send next heartbeat | 00:58 |
| zhouhan | It wouldn't take too many times of change with power of 2 to set it to the desired value, but of course it would be better to have the capability to set it directly at cluster initialization. It is on my list but just not a priority :) | 01:03 |
| avishnoi | zhouhan: okay, because leader append the log entry first, it start acting on it. | 01:04 |
| zhouhan | yep | 01:05 |
| avishnoi | zhouhan: in case of no client initiated transaction, periodic heart beat is sent before every election-timer ? or periodic heartbeat works on diffrent counter ? | 01:05 |
| zhouhan | every 1/3 of election timer | 01:06 |
| zhouhan | roughly. There is a random delta added | 01:07 |
| avishnoi | zhouhan: i think if heart beat can use different counter, we can update election timer to any value without issue. | 01:10 |
| avishnoi | zhouhan: because providing this timer at the time of initialization won’t help if user change the timer dynamically | 01:10 |
| avishnoi | zhouhan: user can still hit the same issue. | 01:10 |
| zhouhan | ok, but would the x2 limit be a problem still? | 01:11 |
| avishnoi | zhouhan: not really, it’s just a minor operational inconvinience, nothing else. | 01:12 |
| avishnoi | zhouhan: admin will have to cook-up this logic explictly, rather than simply firing one command. | 01:13 |
| avishnoi | zhouhan: But nothing major as such i think. | 01:13 |
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| zhouhan | I think if initial value can be set properly, there shouldn't be any operational problem, right? Unless the initial value is set to an insane value. | 01:17 |
| zhouhan | Our practice now is simply adjust the value to desired right after a new cluster is initialized. This doesn't happen very often in reality. | 01:18 |
| zhouhan | Then during special operations we usually only need to run one command to adjust it to the new desired value. | 01:19 |
| zhouhan | avishnoi: It would be great if there is a way to improve. I am not quite clear about the idea of "different counter". Maybe we can discuss in ML with more details. Patches are welcome as well :) | 01:21 |
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| avishnoi | zhouhan_: Well setting this election timer depends on the environment (Latency + Disk speed + CPU load on process running raft implementation etc). So you might have to keep tuning in how things are changing in your deployment environment. It can be improved, but as i said, it’s not really critical. | 03:39 |
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| aserdean | Hi all | 17:01 |
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| acidfu | heya folks | 22:19 |
| acidfu | how can I clear this field | 22:19 |
| acidfu | sudo ovs-vsctl clear Open_vSwitch . other_config:n-handler-threads | 22:19 |
| acidfu | ovs-vsctl: Open_vSwitch does not contain a column whose name matches "other_config:n-handler-threads" | 22:19 |
| acidfu | I mean I can do: ovs-vsctl --no-wait set Open_vSwitch . other_config:n-revalidator-threads=25 | 22:20 |
| acidfu | set works, but not clear ? :/ | 22:20 |
| acidfu | how to I clear it back to empty ? | 22:20 |
| acidfu | thanks ! | 22:20 |
| acidfu | I want to get back to this: | 22:27 |
| acidfu | # ovs-vsctl get Open_vSwitch . other-config | 22:27 |
| acidfu | {} | 22:27 |
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