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Answering to your questions, with the PESSIMISTIC or implicit transactions EntryProcessor will cause a lock on a key, thus making one of the threads waiting on another. Probably, you should consider the OPTIMISTIC <https://apacheignite.readme.io/docs/transactions#section-optimistic-transactions> mode. -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/EntryProcessor-and-Locks-tp16150p16169.html Sent from the Apache Ignite Users mailing list archive at Nabble.com.