public Cluster.Member getMember(String memberKey) {
    Cluster.Member member;

    synchronized (membersHMap) {
      member = membersHMap.get(memberKey);
    }

    return member;
  }
Key should be memberId + memberName Where the ':' in member id and member names are replaced by
'-'


@return the Member for a given key
geode-pulse/src/main/java/org/apache/geode/tools/pulse/internal/data/Cluster.java