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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
Hide

You can prove it with the following simple JS script:

var st = new ShardingTest({shards: {rs0: {nodes: 2}}, mongos: 1, config: 1, useBridge: true}); // Delay messages Primary -> Secondary (12000 ms) st.rs0.getSecondary().delayMessagesFrom(st.rs0.getPrimary(),12000); // Insert using both the replica nodes assert.commandFailed(st.s0.getCollection('testDB.cll').insert({test: 5}, {writeConcern: {w: 2, wtimeout: 4000}}));

The last insert works but it shouldn't.
Show
You can prove it with the following simple JS script: var st = new ShardingTest({shards: {rs0: {nodes: 2}}, mongos: 1, config: 1, useBridge: true}); // Delay messages Primary -> Secondary (12000 ms) st.rs0.getSecondary().delayMessagesFrom(st.rs0.getPrimary(),12000); // Insert using both the replica nodes assert.commandFailed(st.s0.getCollection('testDB.cll').insert({test: 5}, {writeConcern: {w: 2, wtimeout: 4000}})); The last insert works but it shouldn't.
Sprint:
STM 2020-10-05, STM 2020-10-19
Linked BF Score:
31
Story Points:
0

I've noticed that delayMessagesFrom() is actually not delaying messages between replica node of the same shard.

This function is currently used by just one test and the code of the function is 4 years old now.