@Override
  public RunCatalogScanResponse runCatalogScan(RpcController c, RunCatalogScanRequest req)
    throws ServiceException {
    rpcPreCheck("runCatalogScan");
    try {
      return ResponseConverter.buildRunCatalogScanResponse(this.server.catalogJanitorChore.scan());
    } catch (IOException ioe) {
      throw new ServiceException(ioe);
    }
  }
Turn on/off snapshot auto-cleanup based on TTL
@param enabledNewVal Set to <code>true</code> to enable, <code>false</code> to disable
@param synchronous   If <code>true</code>, it waits until current snapshot cleanup is
                     completed, if outstanding
@return previous snapshot auto-cleanup mode
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java