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For anyone else who sees this problem; we did a rolling restarted of our Zookeeper nodes which seemed to fix the issue.

Hmmm... what version are you on? Have you tried using

druid.coordinator.loadqueuepeon.type=http

to avoid the dependency on zookeeper for load/drop instructions?

We are on 0.23.0. I was not aware of this config option; we are using the default value which I see was changed from

curator

to

http

in the latest version. Interesting. Thank you.

@Sergio Ferragut - regarding your answer is druid can work without zookeeper when setting druid.coordinator.loadqueuepeon.type=http ?

There is work being done to fully remove zookeeper. But this parameter avoids zk as the communication mechanism between the coordinator and the historical nodes.