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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/08/17 13:18:37 UTC
[GitHub] [rocketmq] TheR1sing3un opened a new issue, #4835: Add a cli command to transfer leadership in controllers
TheR1sing3un opened a new issue, #4835:
URL: https://github.com/apache/rocketmq/issues/4835
1.Add a cli command to transfer leadership in controllers.
2.This command can transfer leadership when the cluster occurs the asymmetric network partition, to avoid unnecessary master replacement.(situation like this : https://github.com/apache/rocketmq/issues/4800, we can transfer the leadership)
3.More flexible to deal the problem about controller~
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[GitHub] [rocketmq] RongtongJin commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
RongtongJin commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218032886
Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218099573
backgroud:
- in asymmetric network partition,
- controller-leader can connect to other controller-followers
- all brokers can connect to two controller-follower, but can't connect to controller-leader
- because the network in controllers is normal, so the controller-leader is always leader
- because none of brokers can send hearbeat to controller-master, so the master can't elect any new master in brokers
- so now the cluster lose the HA
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218042667
>
> > Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
>
> It seems like they are different, one is a command to elect master in brokers, another is a commadn to transfer leadership in controllers(controllers is a raft cluster)
I want to add this command to transfer leadership from controller-master to its controller-follower(based on the leadertransfer feature in dledger)
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[GitHub] [rocketmq] RongtongJin commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
RongtongJin commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218046493
> >
>
> > > Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
> >
> >
> > It seems like they are different, one is a command to elect master in brokers, another is a commadn to transfer leadership in controllers(controllers is a raft cluster)
>
> I want to add this command to transfer leadership from controller-master to its controller-follower(based on the leadertransfer feature in dledger)
Could you explain the usage scenario again? It would be better to have a example.
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218917115
> > > > >
> > > >
> > > >
> > > > > > Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
> > > > >
> > > > >
> > > > > It seems like they are different, one is a command to elect master in brokers, another is a commadn to transfer leadership in controllers(controllers is a raft cluster)
> > > >
> > > >
> > > > I want to add this command to transfer leadership from controller-master to its controller-follower(based on the leadertransfer feature in dledger)
> > >
> > >
> > > Could you explain the usage scenario again? It would be better to have an example.
> >
> > In this case, this command may be helpful.  backgroud:
> >
> > * in asymmetric network partition,
> > * controller-leader can connect to other controller-followers
> > * all brokers can connect to two controller-follower, but can't connect to controller-leader
> > * because the network in controllers is normal, so the controller-leader is always leader
> > * because none of brokers can send hearbeat to controller-master, so the controller-leader can't elect any new master in brokers
> > * so now the cluster lose the HA
>
> In this case, it seems that it would be better to go offline the controller-leader directly.
yep！I get it！
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[GitHub] [rocketmq] TheR1sing3un closed issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un closed issue #4835: Add a cli command to transfer leadership in controllers
URL: https://github.com/apache/rocketmq/issues/4835
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218037461
> Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
It seems like they are different, one is a command to elect master in brokers, another is a commadn to transfer leadership in controllers(controllers is a raft cluster)
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218000958
If this issue is necessary, please assign it to me~
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[GitHub] [rocketmq] RongtongJin commented on issue #4835: Add a cli command to transfer leadership in controllers
Posted by GitBox <gi...@apache.org>.
RongtongJin commented on issue #4835:
URL: https://github.com/apache/rocketmq/issues/4835#issuecomment-1218914890
> > > >
> > >
> > >
> > > > > Hi @TheR1sing3un, It seems that the function of #4798 is duplicated.
> > > >
> > > >
> > > > It seems like they are different, one is a command to elect master in brokers, another is a commadn to transfer leadership in controllers(controllers is a raft cluster)
> > >
> > >
> > > I want to add this command to transfer leadership from controller-master to its controller-follower(based on the leadertransfer feature in dledger)
> >
> >
> > Could you explain the usage scenario again? It would be better to have an example.
>
> In this case, this command may be helpful.  backgroud:
>
> * in asymmetric network partition,
> * controller-leader can connect to other controller-followers
> * all brokers can connect to two controller-follower, but can't connect to controller-leader
> * because the network in controllers is normal, so the controller-leader is always leader
> * because none of brokers can send hearbeat to controller-master, so the controller-leader can't elect any new master in brokers
> * so now the cluster lose the HA
In this case, it seems that it would be better to go offline the controller-leader directly.
--
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