apache/hadoop · error · IllegalArgumentException

Invalid arguments list!

Error message

Invalid arguments list!

What it means

IllegalArgumentException('Invalid arguments list!') thrown by Anonymizer after successful parsing when neither -trace nor -topology was seen (anonymizeTopology and anonymizeTrace both false). Unlike the 'Illegal arguments list!' case, parsing itself succeeded — the tool just has no work to do and refuses to run.

Source

Thrown at hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/Anonymizer.java:81

        if ("-trace".equals(args[i])) {
          anonymizeTrace = true;
          inputTracePath = new Path(args[i+1]);
          outputTracePath = new Path(args[i+2]);
          i +=2;
        }
        if ("-topology".equals(args[i])) {
          anonymizeTopology = true;
          inputTopologyPath = new Path(args[i+1]);
          outputTopologyPath = new Path(args[i+2]);
          i +=2;
        }
      }
    } catch (Exception e) {
      throw new IllegalArgumentException("Illegal arguments list!", e);
    }
    
    if (!anonymizeTopology && !anonymizeTrace) {
      throw new IllegalArgumentException("Invalid arguments list!");
    }
    
    statePool = new StatePool();
    // initialize the state manager after the anonymizers are registered
    statePool.initialize(getConf());
     
    outMapper = new ObjectMapper();
    // define a module
    SimpleModule module = new SimpleModule(
        "Anonymization Serializer", new Version(0, 1, 1, "FINAL", "", ""));
    // add various serializers to the module
    // use the default (as-is) serializer for default data types
    module.addSerializer(DataType.class, new DefaultRumenSerializer());
    // use a blocking serializer for Strings as they can contain sensitive 
    // information
    module.addSerializer(String.class, new BlockingSerializer());
    // use object.toString() for object of type ID
    module.addSerializer(ID.class, new ObjectStringSerializer<ID>());

View on GitHub (pinned to 2add963021)

Solutions

1. Include at least one of '-trace <in> <out>' or '-topology <in> <out>' in the command
2. Check flag spelling and case — the equals checks are exact ('-trace', '-topology')
3. If flags come from a variable in a script, echo the assembled command to verify they were passed
4. Remember each flag consumes the two following arguments; a missing pair can instead trigger the sibling 'Illegal arguments list!' error

Example fix

# before (no mode flag -> Invalid arguments list!)
hadoop jar rumen.jar org.apache.hadoop.tools.rumen.Anonymizer

# after
hadoop jar rumen.jar org.apache.hadoop.tools.rumen.Anonymizer -topology /in/topo.json /out/topo-anon.json

boolean hasMode(String[] a) {
  for (String s : a) {
    if ("-trace".equals(s) || "-topology".equals(s)) return true;
  }
  return false;
}
if (!hasMode(args)) throw new RuntimeException("need -trace or -topology");

try {
  anonymizer.run(args);
} catch (IllegalArgumentException e) {
  if (e.getMessage().contains("Invalid")) printUsage();
  else throw e;
}

When it happens

Trigger: Invoking the Anonymizer with only JVM/config options or misspelled flags ('-trac', '-Topology') so that neither anonymizeTrace nor anonymizeTopology is ever set; note the flags are case-sensitive ('-trace' lowercase).

Common situations: Misspelled or capitalized flags (e.g. '-TRACE'); scripts passing flags through an env variable that expands empty; running the jar with only a config path and expecting GUI behavior.

Related errors

• Illegal arguments list!
• Can not open a folder
• Failed to rename %s to %s, %s is a file
• Failed to rename %s to %s, file already exists or not empty!
• Truncate is not supported by BaiduBosFileSystem

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/9a466ef9293c9498. Report an issue: GitHub.