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We are programatically submitting transactions to the blockchain using cardano-wallet. Everything seems to be fine when we do so. cardano-wallet returns a 202 indicating success along with a transaction id and everything else you would expect. However, when we go check the blockchain explorer for the tx it isn't there. As you might expect, the chain never reflects the change (customers don't receive what we send them).

The only thing we see in the logs is that sometime after sending the tx the cardano node will provide the TraceMempoolRemoveTxs error. Here is he full line from the node:

cardano-node-1    | [c7e60f27:cardano.node.Mempool:Info:59] [2021-11-24 20:24:55.43 UTC] fromList [("txs",Array [Object (fromList [("txid",String "txid: TxId {_unTxId = SafeHash \"53625bb985197b9af7e41b12449f70666dcebf8fe9afc65dae29557b31d02d14\"}")])]),("mempoolSize",Object (fromList [("bytes",Number 0.0),("numTxs",Number 0.0)])),("kind",String "TraceMempoolRemoveTxs")]

Now, this event occurs more often than not, but it does not always occur. Sometimes our transactions successfully make it through to the blockchain. We can find no clear pattern on when they do or not.

Does anyone know what is happening here or how we can deal with it?

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  • HTTP code 202 does not mean success. It means "The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon, as it might be disallowed when processing actually takes place."
    – grim_i_am
    Apr 21, 2022 at 9:01

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This occurred because our time_to_live in the transaction was too low. The recommended value in iohk documentation is 10 which is woefully inadequate. If this is happening to you bump this up. We set ours to 300 which has been working great.

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