Does anyone know how events emitted from a contract?
I can't seem to find an authoritative answer while googling and I am kind of worried that they are synchronous.
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Events are emitted when a transaction is mined into a block, in the order they are fired.
When watching a pending transaction, this suggests that filters are only notified of all events when the transaction is completed, but the order of events is preserved.
When [events] are called they cause the arguments to be stored in the transaction’s log - a special data structure in the blockchain. These logs are associated with the address of the contract and will be incorporated into the blockchain...
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1Ok, that clarifies some things. But what happens to the execution of a miner if its transaction log runs out of disk or takes a really long time to complete? Will this miner effectively block the execution for the entire network? – Daniel May 16 '16 at 08:11
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Each log costs gas and ultimately limited by the block gas limit so they are no problem for miners to handle. – eth May 16 '16 at 08:19
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1@Daniel If a miner runs out of disk, it won't successfully mine the block, so some other node will. – Nick Johnson May 16 '16 at 09:37