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43 lines
1.2 KiB
43 lines
1.2 KiB
package pub_balancer
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/*
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Sequence of operations to ensure ordering
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Assuming Publisher P10 is publishing to Topic Partition TP10, and Subscriber S10 is subscribing to Topic TP10.
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After splitting Topic TP10 into Topic Partition TP11 and Topic Partition TP21,
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Publisher P11 is publishing to Topic Partition TP11, and Publisher P21 is publishing to Topic Partition TP21.
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Subscriber S12 is subscribing to Topic Partition TP11, and Subscriber S21 is subscribing to Topic Partition TP21.
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(The last digit is ephoch generation number, which is increasing when the topic partitioning is changed.)
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The diagram is as follows:
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P10 -> TP10 -> S10
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||
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\/
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P11 -> TP11 -> S11
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P21 -> TP21 -> S21
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The following is the sequence of events:
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1. Create Topic Partition TP11 and TP21
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2. Close Publisher(s) P10
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3. Close Subscriber(s) S10
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4. Close Topic Partition TP10
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5. Start Publisher P11, P21
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6. Start Subscriber S11, S21
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The dependency is as follows:
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2 => 3 => 4
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v v
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1 => (5 | 6)
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And also:
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2 => 5
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3 => 6
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For brokers:
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1. Close all publishers for a topic partition
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2. Close all subscribers for a topic partition
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3. Close the topic partition
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*/
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