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I have 2 servers with running the same Bitcoin Core v0.9.3.0-g40d2041-beta (64-bit). I use getrawmempool to get all new transactions in the same time but I have different result. One server always have more transactions. Difference quite big - about 10%.
Why?
I am trying monitor all new transactions for some reasons and this difference means for me that getrawmempool not is not good way for this.
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Why do you expect them to be identical?
There are no guarantees about synchronization between mempool contents. In fact, if there was, we wouldn't need a blockchain at all. We'd just use "time of entering mempool" to order transactions.
Transactions are relayed across the network, but under various conditions, and usually the mempool contents reflects what a node decided to relay.
Reasons for variations between nodes:
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getrawmempool: lists the transactions in bitcoind's memory and isnt the best way to monitor all new transactions.
You could use data from blockexplorers, the best one that does address tracking and analysis is blocktrail.com
I need to get transaction just after payment was made. I know only destination address(not from my wallet) and amount. I do not want to use external services. Let me know if you know another approach without using getrawmempool. – Alex – 2014-12-12T16:07:20.003
Where are these servers geographically located? Do they have the same .config files and command line parameters? Did you try restarting them both at the same time? – George Kimionis – 2014-12-11T22:10:29.787
In addition to @GeorgeKimionis's suggestions, you may want to use the
-addnodestart-up option or theaddnodeRPC to make sure both servers are connected to each other. – David A. Harding – 2014-12-11T23:14:25.857