Reference:
https://youtu.be/DphnpWVYeG8?t=2250
Although this talk was back in 2016, there are several points to take away:
1. the way project 'merced' operates reminds me of paper 'Sparrow'
https://cs.stanford.edu/~matei/papers/2013/sosp_sparrow.pdf
And their use of zk as message delivery is fun.
2. back then Kafka doesn't support exactly once delivery and transaction commit;
thus they've spent quite of efforts for that.
3. back then K8S an't popular/feature rich enough which addresses HA issues~
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