What's new in Cloudera Runtime 7.1.9 SP2 CHF 1

Ozone

Configurable replica counts for diverged quasi-closed containers

Ozone now features configurable replica counts for diverged quasi-closed containers, enhancing data resilience.

Previously, Ozone maintained a fixed two copies for each origin of a diverged quasi-closed container. With this update, you can customize replica counts to allocate more copies to the origin with the highest Block Commit Sequence ID (BCSID). Increasing the replication factor for the healthiest, most up-to-date origin significantly reduces the risk of data loss during node failures.

The following new dynamic configuration keys are now available to manage these replica counts:

Table 1. Replica count configuration keys

Configuration key	Description	Default value
hdds.scm.replication.quasi.closed.stuck.best.origin.copies	Defines the number of copies to maintain for the origin with the highest BCSID among healthy replicas.	3
hdds.scm.replication.quasi.closed.stuck.other.origin.copies	Defines the number of copies to maintain for all other origins of the same container.	2