"Safeties" for dangerous operations (hadoop namenode -format) about ironfan HOT 2 CLOSED

# block not run if node[:hadoop][:namenode_formatted] is true
SafetyCatch.one_time(:hadoop, :namenode_formatted) do
  # ... does some stuff, and then sets
  # node[:hadoop][:namenode_formatted] to true
end

SafetyCatch.interlock(:hadoop, :namenode_formatted) do
  # this runs regardless, but if an error is raised
  # it prints instructions for setting
  # node[:hadoop][:namenode_formatted]  to false.
end