kvserver: also block LEARNER snaps to paused followers #85730
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We checked whether the snapshot recipient was paused only in the raft log queue path. By pushing the check down into `sendSnapshot`, it is now hit by any snapshot attempt, which includes the replicate queue and store rebalancer. For best results, both of these should avoid moving replicas to paused followers in the first place, which they already do, at least partially, so this change shouldn't have much of an impact in practice. Fixes cockroachdb#85479. Release note: None
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We checked whether the snapshot recipient was paused only in the
raft log queue path. By pushing the check down into
sendSnapshot,it is now hit by any snapshot attempt, which includes the replicate
queue and store rebalancer. For best results, both of these should
avoid moving replicas to paused followers in the first place, which
they already do, at least partially, so this change shouldn't have
much of an impact in practice.
Fixes #85479.
Release note: None