private List<String> getRegionServersInZK(final ZKWatcher zkw) throws KeeperException {
    return ZKUtil.listChildrenNoWatch(zkw, zkw.getZNodePaths().rsZNode);
  }
Checks if any dead servers are currently in progress.
@return true if any RS are being processed as dead, false if not
hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java