@Override
  public String getProcedureSignature() {
    return SnapshotManager.ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION;
  }
Create a default snapshot handler - uses a zookeeper based member controller.
@param rss region server running the handler
@throws KeeperException if the zookeeper cluster cannot be reached
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/snapshot/RegionServerSnapshotManager.java