What is the use case of ZeroMQ implementation for bitcoind which will be merged into Bitcoin Core v0.12.0?
Block and Transaction Broadcasting With ZeroMQ https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md
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ZeroMQ is a publisher / subscriber messaging system. In the case of Bitcoin Core it is a socket which other applications can connect to and get notifications of new events in real time, without having to repeatedly ask the daemon if there are any new events. ZMQ support is useful for any systems interfacing with the network like miners and wallets, which can choose to subscribe either to just transaction notifications or block notifications as their situation requires. It covers a lot of the same use area as the prexisting walletnotify and blocknotify systems, but with significantly improved performance and ease of configuration. These older systems have the unfortunate side effect of spawning a new process for every notification, which tends to incapacitate the host if not used extremely carefully.
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2It currently (upcoming 0.12 release) does not support
walletnotify-likes notifications. Only notifications for new blocks or transactions. Commented Oct 4, 2015 at 19:27 -
@JonasSchnelli I'll re-write that to be clearer, I meant you can emulate
walletnotifyby simply subscribing to all transactions and doing your ownIsMine()-style filtering externally.– ClarisCommented Oct 4, 2015 at 22:07