Github user bdeggleston commented on a diff in the pull request:

    https://github.com/apache/cassandra/pull/224#discussion_r189092468
  
    --- Diff: src/java/org/apache/cassandra/locator/ReplicaSet.java ---
    @@ -0,0 +1,142 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.cassandra.locator;
    +
    +import java.util.HashSet;
    +import java.util.Iterator;
    +import java.util.LinkedHashSet;
    +import java.util.Objects;
    +import java.util.Set;
    +
    +import com.google.common.collect.ImmutableSet;
    +import com.google.common.collect.Iterables;
    +import com.google.common.collect.Sets;
    +
    +public class ReplicaSet extends Replicas
    +{
    +    static final ReplicaSet EMPTY = new ReplicaSet(ImmutableSet.of());
    +
    +    private final Set<Replica> replicaSet;
    +
    +    public ReplicaSet()
    +    {
    +        replicaSet = new HashSet<>();
    +    }
    +
    +    public ReplicaSet(int expectedSize)
    +    {
    +        replicaSet = Sets.newHashSetWithExpectedSize(expectedSize);
    +    }
    +
    +    public ReplicaSet(Replicas replicas)
    +    {
    +        replicaSet = Sets.newHashSetWithExpectedSize(replicas.size());
    +        Iterables.addAll(replicaSet, replicas);
    +    }
    +
    +    private ReplicaSet(Set<Replica> replicaSet)
    +    {
    +        this.replicaSet = replicaSet;
    +    }
    +
    +    public boolean equals(Object o)
    +    {
    +        if (this == o) return true;
    +        if (o == null || getClass() != o.getClass()) return false;
    +        ReplicaSet that = (ReplicaSet) o;
    +        return Objects.equals(replicaSet, that.replicaSet);
    +    }
    +
    +    public int hashCode()
    +    {
    +        return Objects.hash(replicaSet);
    --- End diff --
    
    fixed


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