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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/08/09 10:51:45 UTC
[GitHub] [rocketmq] steven-wal opened a new issue, #4800: Should need change broker role immediately when broker inactive
steven-wal opened a new issue, #4800:
URL: https://github.com/apache/rocketmq/issues/4800
In a distributed environment, the network partitions always sad. If the master broker register to 3 nameserver nodes, sometimes it has a network partion probelm with the leader namesrv, but send heartbeat normally with other namesrv nodes. In such cases, we need change broker role immediately? Or should we check the broker status on other namesrvs?
https://github.com/apache/rocketmq/blob/ce274265db8af73e28624ecc1fc98cc984658844/controller/src/main/java/org/apache/rocketmq/controller/ControllerManager.java#L106
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[GitHub] [rocketmq] github-actions[bot] commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1694527607
This issue was closed because it has been inactive for 3 days since being marked as stale.
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[GitHub] [rocketmq] lizhanhui commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by GitBox <gi...@apache.org>.
lizhanhui commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1211496107
This looks like an already well-defined case in terms of Paxos, Raft, and other well-known consensus algorithms.
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[GitHub] [rocketmq] lizhimins commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by GitBox <gi...@apache.org>.
lizhimins commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1221888473
It is recommended to use raft for service discovery due to it enforces a stronger degree of coherency to reduce the number of states that must be considered.
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[GitHub] [rocketmq] RongtongJin commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by GitBox <gi...@apache.org>.
RongtongJin commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1210053781
@Stevenzall This is a good issue, How to solve the unnecessary handover jitter under the asymmetric network partition. In the current implementation, the broker role will be changed immediately if network partition occurs between the master broker and the leader controller. Do you are interested in proposing a more detailed plan to solve this problem?
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[GitHub] [rocketmq] github-actions[bot] commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1689076862
This issue is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs.
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[GitHub] [rocketmq] Stevenzall commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by GitBox <gi...@apache.org>.
Stevenzall commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1211487765
@RongtongJin I'm just starting to get familiar with the project. If I have a good idea, i will give a little proposing, really happy contributting to community.
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[GitHub] [rocketmq] TheR1sing3un commented on issue #4800: Should need change broker role immediately when broker inactive?
Posted by GitBox <gi...@apache.org>.
TheR1sing3un commented on issue #4800:
URL: https://github.com/apache/rocketmq/issues/4800#issuecomment-1214783654
IMO, in this case:
- three nameSrvs with controller mode
- controller-master
- controller-follower-1
- controller-follower-2
- three master/slave mode brokers
- broker-master
- broker-slave1
- broker-slave2
occurs network partition like this:
In this case, broker-master can't connect to controller-master becasue of the network partition. But it stay in same partition with brokers and controller-follower1 and controller-follower2. So when the controller-master find that broker-master is inavtive. It will propose an ElectMasterEvent, however the controller-master also can't connet to his followers, so controller-master fali to append this event by dledger(raft). So in this case, the master in brokers will not change!
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[GitHub] [rocketmq] github-actions[bot] closed issue #4800: Should need change broker role immediately when broker inactive?
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #4800: Should need change broker role immediately when broker inactive?
URL: https://github.com/apache/rocketmq/issues/4800
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