@Test
    @LoadGraphWith(MODERN)
    public void shouldSupportBroadcastKeys() throws Exception {
        final ComputerResult result = graphProvider.getGraphComputer(graph).program(new VertexProgramP()).submit().get();
        assertTrue(result.memory().exists("m1"));
        assertFalse(result.memory().exists("m2"));
        assertFalse(result.memory().exists("m3"));
        assertTrue(result.memory().exists("m4"));
        assertTrue(result.memory().get("m1"));
        assertEquals(-18, result.memory().<Integer>get("m4").intValue());
        assertEquals(2, result.memory().keys().size());
    }
Javadoc for {@code ConcurrentSkipListSet} includes this little note: "Beware that, unlike in most
collections, the size method is not a constant-time operation." Doing a traversal of elements will yield
the correct count. Java 11 upgrade seemed to force this failure consistently.
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/computer/GraphComputerTest.java