### Question:
CardinalityAggregator extends PropogatingCombiner { @Override public void reset() { if (log.isDebugEnabled()) log.debug("Resetting CardinalityAggregator"); this.propogate = true; }  @Override Value reduce(Key key, Iterator<Value> iter); @Override void reset(); static final Value EMPTY_VALUE; }### Answer:
@Test public void testResetPropagate() { agg.reset(); assertTrue(agg.propogateKey()); agg.setPropogate(false); assertFalse(agg.propogateKey()); agg.reset(); assertTrue(agg.propogateKey()); }