@Override
  public Set<InternalDistributedMember> getOtherDistributionManagerIds() {
    // We return a modified copy of the list, so
    // collect the old list and copy under the lock.
    Set<InternalDistributedMember> result = new HashSet<>(getDistributionManagerIds());

    InternalDistributedMember me = getDistributionManagerId();
    result.remove(me);

    // It's okay for my own id to not be in the list of all ids yet.
    return result;
  }
Returns a private-memory list containing the identities of all the other known distribution
managers not including me.
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java