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https://issues.apache.org/jira/browse/KUDU-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriella Lotz reassigned KUDU-3766:
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Assignee: (was: Gabriella Lotz)
> Master has no visibility into tserver quiescing state
> -----------------------------------------------------
>
> Key: KUDU-3766
> URL: https://issues.apache.org/jira/browse/KUDU-3766
> Project: Kudu
> Issue Type: Bug
> Reporter: Gabriella Lotz
> Priority: Major
>
> The Kudu master has no knowledge of whether a tserver is quiescing. As a
> result, three master-side subsystems make placement decisions that ignore
> quiescing:
> * Auto leader rebalancer: schedules leader transfers to a quiescing tserver
> every interval. The Raft layer silently drops each transfer, wasting the full
> move budget for that round.
> * Replica rebalancer: includes quiescing tservers as valid destinations for
> replica moves. If a quiescing tserver has fewer replicas than others it can
> receive new ones, directly counteracting a manual drain.
> * Recovery re-replication and table/replica creation:
> AvailableForPlacementUnlocked() in ts_manager.cc gates all master-side
> placement decisions and only checks for MAINTENANCE_MODE and PresumedDead. A
> quiescing tserver passes both checks and can be selected as the destination
> for a recovered under-replicated replica or as a host for a newly created
> replica.
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