Method and system for tree management of trees under multi-version concurrency control

Method for tree management of trees under multi-version concurrency control is described herein. Method starts by detecting change in a size of a cluster. The number of nodes in the cluster is counted to obtain the changed size of the cluster. The number of trees needed for the number of nodes in the cluster is determined. The number of trees may be based on the number of nodes in the cluster and predetermined system balancing coefficient. When the number of trees needed is greater than existing number of trees, existing number of trees is doubled as a single-step operation which includes modifying and scaling hash function used to derive each tree to generate new hash function and using new hash function to partition each tree instantly into two new trees. Scaling happens on demand without service disruption. Hash function scales automatically when number of trees increases. Other embodiments are described.