Hi, I was reading this documentation, https://www.gridgain.com/resources/blog/apache-ignite-transactions-architecture-concurrency-modes-and-isolation-levels, to understand the difference between Optimistic mode with Serializable vs read_committed. The only difference I see from the explanation given is that for Serializable isolation, the "*primary nodes manage the transaction requests internally*" before an ACK is sent to the coordinator while for read_committed, the ACK is sent immediately and the nodes "*manage the transaction requests internally*" later.
My question: 1. What does "*primary nodes manage the transaction requests internally"* exactly mean? 2. What are the specific things a node has to do to manage transaction requests internally? Thanks, John
