Configured table to use non existent compaction service and saw no errors or warnings

[keith-turner]

Describe the bug

Configured a table to use non existent compaction service and saw no errors or warnings in the logs. Also no compactions ran for the table even though they needed to.

Expected behavior

The CompactionJobGenerator should log errors or warning for this.

[dlmarion]

TabletGroupWatcher.manageTablets calls CheckCompactionConfig.validate at:

accumulo/server/manager/src/main/java/org/apache/accumulo/manager/TabletGroupWatcher.java

Lines 440 to 453 in a3fd1ed

	CompactionJobGenerator compactionGenerator =
	new CompactionJobGenerator(new ServiceEnvironmentImpl(manager.getContext()),
	tableMgmtParams.getCompactionHints(), tableMgmtParams.getSteadyTime());
	try {
	CheckCompactionConfig.validate(manager.getConfiguration());
	this.metrics.clearCompactionServiceConfigurationError();
	} catch (RuntimeException | ReflectiveOperationException e) {
	this.metrics.setCompactionServiceConfigurationError();
	LOG.error(
	"Error validating compaction configuration, all {} compactions are paused until the configuration is fixed.",
	store.getLevel(), e);
	compactionGenerator = null;
	}

Maybe this is not a case handled by the validate code?