TGIP-CN-022：复制订阅相关的二三事

1 .TGIP-CN 022 Understand Replicated Subscriptions Penghui Li 

2 .StreamNative Cloud Released https://streamnative.io/blog/tech/2020-08-18-announcing-streamnative-cloud Community Meeting https://github.com/streamnative/pulsar-community-loc-cn/issues/1 Topic Level Policy A. Support MaxUnackedMessagesOnConsumer on topic level B. Support Persistence Policies on topic level C. Support deduplication on topic level Transaction Support A. Transaction message consumption B. Transaction message acknowledgement 

3 .Geo Replication http://pulsar.apache.org/docs/en/administration-geo/ 

4 .Replicated Subscription 

5 .Message ID Ledger ID Entry ID Partition Index Batch Index 

6 .Message Acknowledgment Mark Delete Position 9 8 7 6 5 4 3 2 1 0 Individual Acks 

7 .Message Acknowledgment Cluster A Cluster B 1:0 3:0 1:1 3:1 1:2 3:2 3:0 6:0 3:1 6:1 3:2 6:2 3:3 6:3 

8 .Cursor Snapshot Cluster A Cluster B 1:0 3:0 3:0 6:0 3:3 6:3 

9 .Cursor Snapshot Flow Cluster A ReplicatedSubscriptionsSnapshotRequest ReplicatedSubscriptionsSnapshotRequest Cluster B Cluster C 

10 .Cursor Snapshot Flow Cluster A ReplicatedSubscriptionsSnapshotResponse ReplicatedSubscriptionsSnapshotResponse Cluster B Cluster C 

11 .Cursor Snapshot Flow 

12 .Storing Cursor Snapshot 9 S 8 7 6 S 5 4 3 S 2 1 0 Snapshot Marker 

13 .Update Remote Cursor 9 S 8 7 6 S 5 4 3 S 2 1 0 ReplicatedSubscriptionUpdate 

14 .Enable Replicated Subscriptions enableReplicatedSubscriptions=true 

15 .Configure Replicated Subscriptions 

16 .Limitations A. The cursor snapshots are taken periodically B. Only sync mark delete position C. The snapshots can only be taken if all involved clusters are available D. Affect the calculation of the backlog 

17 .扫码⼊群！ Pulsar 中国社区等你加⼊ 添加好友后，回复“进群”即可 

18 .Thanks