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admin: reject maintenance mode req on 1 node cluster #4921

Merged
merged 2 commits into from
May 31, 2022
Merged

admin: reject maintenance mode req on 1 node cluster #4921

merged 2 commits into from
May 31, 2022

Commits on May 25, 2022

  1. admin: reject maintenance mode req on 1 node cluster 

    If a single node cluster puts its only node in maintenance
mode, then there is no node elegible to become controller
leader, and all further progress is stopped.

Fixes redpanda-data#4338
    @jcsp
    jcsp committed May 25, 2022
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  2. cluster: drop maintenance mode messages on n=1 cluster 

    If a system got into the bad state of issue redpanda-data#4338, then
their cluster is broken until we replay the controller
log _without_ putting the node into maintenance mode.

Related redpanda-data#4338
    @jcsp
    jcsp committed May 25, 2022
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