[Bug] EnforceMinNumRacksPerWriteQuorum is not working correctly in the isEnsembleAdheringToPlacementPolicy method of RackawareEnsemblePlacementPolicyImpl

[danpi]

BUG REPORT

Describe the bug
I'm a bit confused about the meaning of the enforceMinNumRacksPerWriteQuorum parameter.
When I set enforceMinNumRacksPerWriteQuorum=false and minNumRacksPerWriteQuorum=2. I ran this test expecting the result to be MEETS_STRICT, but it returned FAIL. I believe that when enforceMinNumRacksPerWriteQuorum is set to false, as long as the number of selected racks is greater than 1, the result should be MEETS_STRICT.

The problem might be in the code snippet from the isEnsembleAdheringToPlacementPolicy method:
if ((racksInQuorum.size() < minNumRacksPerWriteQuorumForThisEnsemble) || (enforceMinNumRacksPerWriteQuorum && racksInQuorum.contains(getDefaultRack()))) { return PlacementPolicyAdherence.FAIL; }

The modified code, which ensures that enforceMinNumRacksPerWriteQuorum is effective, is as follows:
if (enforceMinNumRacksPerWriteQuorum && (racksInQuorum.size() < minNumRacksPerWriteQuorumForThisEnsemble || racksInQuorum.contains(getDefaultRack()))) { return PlacementPolicyAdherence.FAIL; }
To Reproduce

@Test
public void testIsEnsembleAdheringToPlacementPolicyWithEnableEnforceMinRacks() throws Exception {
    BookieSocketAddress addr1 = new BookieSocketAddress("127.0.0.2", 3181);
    BookieSocketAddress addr2 = new BookieSocketAddress("127.0.0.3", 3181);
    BookieSocketAddress addr3 = new BookieSocketAddress("127.0.0.4", 3181);

    StaticDNSResolver.addNodeToRack(addr1.getHostName(), "/default-region/r1");
    StaticDNSResolver.addNodeToRack(addr2.getHostName(), "/default-region/r1");
    StaticDNSResolver.addNodeToRack(addr3.getHostName(), "/default-region/r1");

    // Update cluster
    Set<BookieId> addrs = new HashSet<BookieId>();
    addrs.add(addr1.toBookieId());
    addrs.add(addr2.toBookieId());
    addrs.add(addr3.toBookieId());
    repp.onClusterChanged(addrs, new HashSet<BookieId>());

    List<BookieId> ensemble = new ArrayList<>();
    ensemble.add(addr1.toBookieId());
    ensemble.add(addr2.toBookieId());
    assertEquals("PlacementPolicyAdherence", PlacementPolicyAdherence.MEETS_STRICT,
            repp.isEnsembleAdheringToPlacementPolicy(ensemble, 2, 2));
}

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