code: private void logs(final String applicationId, final File folder) throws IOException {
      LOG.log(Level.FINE, "Fetching logs for application [{0}] and storing them in folder [{1}]",
          new Object[]{applicationId, folder.getAbsolutePath()});
      if (!folder.exists() && !folder.mkdirs()) {
        LOG.log(Level.WARNING, "Failed to create [{0}]", folder.getAbsolutePath());
      }
      this.logFetcher.fetch(applicationId, folder);
    }
docs: Fetches the logs for the application with the given id and stores them in the given folder. One file per container.
  
  @param applicationId
  @param folder
  @throws IOException