| Option | DEFAULT_MIN_HOST_ALIVE_PERCENTAGE_TO_ENABLE_CLUSTER_REBALANCING | |
| Description | Sets the minimum percentage of cluster hosts that must be alive and operational before cluster rebalancing operations are permitted. This safety threshold prevents rebalancing activities during cluster outages or instability. | |
| Introduced Version | 1.82.0 | |
| Default | 25 | |
| Minimum | 0 | |
| Maximum | 100 | |
If cluster rebalancing is enabled
(DEFAULT_ALLOW_REBALANCE_EXISTING_SEGMENTS), then
this setting considers whether the cluster is healthy enough for
rebalancing to occur. Higher values only allow rebalancing when
the cluster is mostly healthy. Lower values allow rebalancing
with fewer healthy nodes.
For example, if you have this setting set to 50% and 75% of nodes are down, rebalancing is disabled. But if only 25% of nodes are down, rebalancing would be permitted.