public JVMClusterUtil.RegionServerThread resumeRegionServer(int serverNumber) {
    JVMClusterUtil.RegionServerThread server = hbaseCluster.getRegionServers().get(serverNumber);
    LOG.info("Resuming {}", server.toString());
    server.resume();
    return server;
  }
Resume the specified region server
@param serverNumber Used as index into a list.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/MiniHBaseCluster.java