def METHOD_NAME(vm):
  """Install YCSB on the client VM."""
  vm.Install('ycsb')
  # Disable logging for MongoDB driver, which is otherwise quite verbose.
  log_config = """<configuration><root level="WARN"/></configuration>"""
  vm.RemoteCommand("echo '{0}' > {1}/logback.xml".format(
      log_config, ycsb.YCSB_DIR))