CValidationInterface::TransactionRemovedFromMempool

virtual
void
TransactionRemovedFromMempool(
    CTransactionRef const& tx,
    MemPoolRemovalReason reason,
    uint64_t mempool_sequence);

Description

This notification fires for transactions that are removed from the mempool for the following reasons:

• EXPIRY (expired from mempool after -mempoolexpiry hours)

• SIZELIMIT (removed in size limiting if the mempool exceeds -maxmempool megabytes)

• REORG (removed during a reorg)

• CONFLICT (removed because it conflicts with in-block transaction)

• REPLACED (removed due to RBF replacement)

This does not fire for transactions that are removed from the mempool because they have been included in a block. Any client that is interested in transactions removed from the mempool for inclusion in a block can learn about those transactions from the MempoolTransactionsRemovedForBlock notification.

Transactions that are removed from the mempool because they conflict with a transaction in the new block will have TransactionRemovedFromMempool events fired before the BlockConnected event is fired. If multiple blocks are connected in one step, then the ordering could be:

• TransactionRemovedFromMempool(tx1 from block A)

• TransactionRemovedFromMempool(tx2 from block A)

• TransactionRemovedFromMempool(tx1 from block B)

• TransactionRemovedFromMempool(tx2 from block B)

• BlockConnected(A)

• BlockConnected(B)

Called on a background thread.