[KUDU-3209] Allow decommissioning tool to run without rebalancing the rest of the cluster

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: CLI, ops-tooling
• Assignee: Unassigned
• Reporter: Andrew Wong
• Created: 28/Oct/20 23:56
• Updated: 28/Oct/20 23:56

Description

Currently when specifying --move_replicas_from_ignored_tservers to the rebalancer tool, the tool first empties the ignored tablet servers, and then runs rebalancing of the rest of the cluster. While true to its name as the "rebalancer tool", this tight coupling isn't always desired, especially given how heavy-weight a full cluster rebalancing can be upon first usage.

It'd be nice if users could specify some --empty_ignored_tservers_only flag that made no attempt at further rebalancing once decommissioning completes.