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Purpose
AppendTableCompactSource,CombinedAppendCompactStreamSourceandCombinedAwareStreamingSourcecallThread.sleepinpollNextwhen there is nothing to compact. This blocks the mailbox thread, so the coordinator always reports 100% busy and checkpoint barriers wait for the sleep.Same fix as #9291 (
QueryFileMonitor): returnNOTHING_AVAILABLEand complete theisAvailable()future from a timer. The timer logic is shared inDelayedAvailability.Tests
DelayedAvailabilityTestAppendTableCompactSourceTestCompactDatabaseActionITCase