Note:
This topic has been translated from a Chinese forum by GPT and might contain errors.
Original topic: max-replicas的设置与查询
[TiDB Usage Environment] Production Environment / Testing / PoC
[TiDB Version]
[Reproduction Path]
[Encountered Problem: Problem Phenomenon and Impact] By setting the number of region replicas to 1 using set config pd 'replication.max-replicas'=1, the official documentation states that subsequent configurations will be based on etcd. What does the etcd configuration mean, and where can I view the etcd configuration information?
[Resource Configuration]
[Attachments: Screenshots/Logs/Monitoring]
pd-ctl should be looking at the contents of etcd.
You can view the parameters set by set config using show config, right?
Why do newly created tables have two replicas after I set max-replicas to 1? As shown in the picture.
Theoretically, after one replica, the default is three, isn’t it the previous one?
Previously, when creating a table, each region had three peers. After changing max-replicas to 1, the regions of newly created tables all have two peers.
Let’s see what roles these two peers have.
“Peers” means replicas. 3 replicas mean: 3 peers.
region_ID: 5548 represents the leader. 5546 represents a replica. However, you are showing 2 replicas here, which is not the default 3 replicas. Also, if the initialization is with two TiKV, there will be 2 replicas.
Please share a screenshot of the display. It shouldn’t be two; it should be one. If there is TiFlash, there should also be a learner node.
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