public boolean updateConnectionAccessTime() {
    String userName = getEffectiveUser();
    ConnectionInfo connInfo = connections.get(userName);
    if (connInfo != null) {
      return connInfo.updateAccessTime();
    }
    return false;
  }
Updates the access time for the current connection. Used to keep Connections alive for
long-lived scanners.
@return whether we successfully updated the last access time
hbase-server/src/main/java/org/apache/hadoop/hbase/util/ConnectionCache.java