Long polling

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Long polling is a method used by some Bitcoin pools by which notifications are sent to all miners when a valid block has been generated and added to the blockchain. This serves the purpose of stopping work on the old block and beginning to work on a fresh block, thus reducing the production of stale shares.

Without long polling, if a miner was in the middle of an assigned workload when a new block was discovered by someone else, it would continue working on the old obsolete block solution until it was finished - thus wasting effort.

Source[edit]

http://bitcoin.it/

See Also on BitcoinWiki[edit]