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A few lines about how transactions work.

TODO enrich

Txs use 2PC protocol.

The first step (near map) on the near node is to calculate the map of this transaction - a set of involved primary nodes. Since one key is involved in the transaction, there will be only one node in the card. For this partition on this version of the topology, a Lock request is sent that executes the lock (k) operation, the semantics of which are similar to acquiring exclusuve key locks.

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