n.v.harikrishna created CASSANDRA-21627:
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Summary: Allow nodetool cms reconfigure to ignore specific hosts
Key: CASSANDRA-21627
URL: https://issues.apache.org/jira/browse/CASSANDRA-21627
Project: Apache Cassandra
Issue Type: Improvement
Components: Transactional Cluster Metadata
Reporter: n.v.harikrishna
Assignee: n.v.harikrishna
When shrinking a cluster, decommissioning a CMS member moves that role to
another node, which may itself be due for decommission. The CMS then has to be
reconfigured again, and this can repeat many times during a single shrink.
Proposing to add _--ignore_ flag to the cms reconfigure command (like cms
initialize has), so that the nodes going to be decommissioned can be excluded
from CMS responsibilities and CMS set remains stable during the operation. One
reconfiguration up front is then enough. The CMS stays on the surviving nodes
for the whole shrink, because decommissioning a node that is not a CMS member
does not trigger a reconfiguration.
The ignore list applies only to that command and is not stored, so nodetool cms
describe keeps reporting the real state.
Proposed command format:
{{nodetool cms reconfigure <rf> --ignore <host> [--ignore <host> ...]}}
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