How do transactions compete in the pending pool?

AlgoSDK
1

I was wondering:

If there are two mutually exclusive transactions in the pending pool, which one wins?

As an example, two liquidation transactions for a protocol like AlgoFi where only one can go through.

Is it first come/first serve, or highest fee wins, or…?

Or does the second one not make it into the pending transactions pool?

Thanks,

Bit

2

Assuming the block proposer runs the official software, it is first come first served (from the point of view of the block proposer - note that not all nodes see the same order of pending transactions).

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3

Interesting, thank you (doubly so for the promptness)

What affects the order of pending transactions? “Distance” from tx broadcasting node? How is the pending tx pool synced?

4

Pending transactions are gossiped between nodes/relays.
Nodes connect randomly to 4 relays and regularly update the worst-performing relay.

It is most likely quite hard to predict exactly the order.
But I would guess (not verified) that geographical distance counts a lot.

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