Jean-Daniel Cryans created KUDU-2069:
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Summary: Add a maintenance mode
Key: KUDU-2069
URL: https://issues.apache.org/jira/browse/KUDU-2069
Project: Kudu
Issue Type: Bug
Reporter: Jean-Daniel Cryans
Adding a maintenance mode in Kudu would mainly prevent replicas from getting
evicted while the cluster remains in that mode. We might also consider
preventing table create/alter/delete.
Maintenance mode is a good thing for two use cases:
- When starting a cluster, some nodes might take longer than others to come
back. We shouldn't kick their replicas out.
- When nodes need to be taken out for a known short period of time, say to
change a disk or perform an OS upgrade, we shouldn't necessarily evict all its
replicas. Right now, taking a node out for more than 5 minutes is equivalent to
wiping it out since it will delete all its replicas when coming back. In fact,
wiping it out might even be preferable since it cleans up the data dirs.
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