Github user lvdongr commented on the issue:
https://github.com/apache/spark/pull/17620
This happend at the time the previous master leader remove the died worker
,clear the worker's node on persistEngine(we use zookeeper),But before the
worker node was removed from the zookeeper ,the leader changed. The new master
leader recovery from the zookeeper ,and read the died worker node. Then the new
leader find the worker died and trying to remove it ,and try to clear the node
on zookeeper,but the node has been removed by the previous leader ,so an
exception was throw, and the recovery fail. Then the leader will always in
COMPLETING_RECOVERY state,and all the application registered cannot get
resources .
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