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In EOSIO, we know that a transaction can be packed in block very fast, and we can also treat it as irreversible after "lastirreversibleblock >= block_num".

  1. Whether a transaction could fail after being included in block, if so, how do I know about it?
  2. and Whether a transaction could fail before being included in a block?

many thanks..

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Whether a transaction could fail after being included in block, if so, how do I know about it?

Yes, once the transaction is in a block it is not executed anymore and, hence, can't fail.

Whether a transaction could fail before being included in a block?

Yes, the response of the transaction call will contain the error.

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  • What happens if a transaction is included in a block, but that block is then lost due to a fork and re-organization? How can I detect the loss/failure of the transaction?
    – John Haager
    Jun 21, 2018 at 18:47
  • If you want to synchronize the state of the chain you should probably be a node. You app probably shouldn't rely on the state changes but on the state itself. Could you clarify your use case?
    – friedger
    Jun 21, 2018 at 19:44
  • @friedger thanks. so a transaction can't fail after being included in a block, and once a transaction being sent, I can immediately know it failed or not through response, right? Another question, is a transaction sent successful but never being included in a block?
    – singed
    Jun 25, 2018 at 8:03

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