out.println("There is no rolling upgrade in progress.");
}
}
static int run(DistributedFileSystem dfs, String[] argv, int idx) throws IOException {
final RollingUpgradeAction action = RollingUpgradeAction.fromString(
argv.length >= 2? argv[1]: "");
if (action == null) {
throw new IllegalArgumentException("Failed to covert \"" + argv[1]
+"\" to " + RollingUpgradeAction.class.getSimpleName());
}