Minor - P4 This test will fail since WriteConcern's equals methods uses == and not equals() for the _w field. I noticed this when testing the new API to pass a string into the WriteConcern constructor. Here is a failing test case
public void testWriteConcernEquality() { String s1 = new String("rack1"); String s2 = new String("rack1"); WriteConcern wc1 = new WriteConcern(s1); WriteConcern wc2 = new WriteConcern(s2); assertThat(wc1, equalTo(wc2)); }