@Override
    @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "EQ_ALWAYS_FALSE",
        justification = "Intentional")
    public boolean equals(Object o) {
      return false; // FindBugs: Causes EQ_ALWAYS_FALSE. Suppressed.
    }
A Map that keeps a sorted array in order to provide the concurrent map interface. Keeping a
sorted array means that it's much more cache line friendly, making reads faster than the tree
version. In order to make concurrent reads and writes safe this does a copy on write. There can
only be one concurrent write at a time.
hbase-common/src/main/java/org/apache/hadoop/hbase/types/CopyOnWriteArrayMap.java