UpdateGraph throws java.lang.IllegalStateException: No outstanding notifications, yet the notification queue is not empty!

[nbauernfeind]

A community member is getting an unexpected shutdown due to the following thrown exception:

Server shutdown: Uncaught exception in thread PeriodicUpdateGraph.DEFAULT.refreshThread

java.lang.IllegalStateException: No outstanding notifications, yet the notification queue is not empty!
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.flushNormalNotificationsAndCompleteCycle(BaseUpdateGraph.java:577)
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.flushNotificationsAndCompleteCycle(BaseUpdateGraph.java:518)
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.lambda$doRefresh$5(BaseUpdateGraph.java:915)
io.deephaven.util.locks.FunctionalLock.doLocked(FunctionalLock.java:33)
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.doRefresh(BaseUpdateGraph.java:900)
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.refreshAllTables(BaseUpdateGraph.java:887)
io.deephaven.engine.updategraph.impl.PeriodicUpdateGraph.refreshAllTables(PeriodicUpdateGraph.java:1090)
io.deephaven.engine.updategraph.impl.BaseUpdateGraph.refreshTablesAndFlushNotifications(BaseUpdateGraph.java:779)
io.deephaven.engine.updategraph.impl.PeriodicUpdateGraph.refreshTablesAndFlushNotifications(PeriodicUpdateGraph.java:1014)
io.deephaven.engine.updategraph.impl.PeriodicUpdateGraph.lambda$new$0(PeriodicUpdateGraph.java:139)
java.base/java.lang.Thread.run(Thread.java:1583)

Working with them to acquire more information of the query causing the issue.

Found in Deephaven 0.31.0

[nbauernfeind]

Closing as this was a combination of several issues. Several already are already closed/merged (#4980, #4976, and #4986) with the only outstanding piece being #4984 (but was unrelated and found during investigation and is otherwise being worked on).