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# On Determinism | ||
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Arguably, the most difficult part of blockchain programming is determinism - that is, ensuring that sources of indeterminism do not creep into the design of such systems. | ||
See [Determinism](../spec/abci/abci.md#determinism). |
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# Transactional Semantics | ||
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In [Using Tendermint](../tendermint-core/using-tendermint.md#broadcast-api) we | ||
discussed different API endpoints for sending transactions and | ||
differences between them. | ||
See details of the [broadcast API](../tendermint-core/using-tendermint.md#broadcast-api) | ||
and the [mempool WAL](../tendermint-core/running-in-production.md#mempool-wal). | ||
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What we have not yet covered is transactional semantics. | ||
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When you send a transaction using one of the available methods, it first | ||
goes to the mempool. Currently, it does not provide strong guarantees | ||
like "if the transaction were accepted, it would be eventually included | ||
in a block (given CheckTx passes)." | ||
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For instance a tx could enter the mempool, but before it can be sent to | ||
peers the node crashes. | ||
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We are planning to provide such guarantees by using a WAL and replaying | ||
transactions (See | ||
[this issue](https://github.com/tendermint/tendermint/issues/248)), but | ||
it's non-trivial to do this all efficiently. | ||
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The temporary solution is for clients to monitor the node and resubmit | ||
transaction(s) and/or send them to more nodes at once, so the | ||
probability of all of them crashing at the same time and losing the msg | ||
decreases substantially. |
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