apache/hadoop · error · IOException

Unable to parse arguments: {}

Error message

Unable to parse arguments: {}

What it means

Error "Unable to parse arguments: {}" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/tools/federation/RouterAdmin.java:812

          i++;
          short modeValue = Short.parseShort(parameters[i], 8);
          existingEntry.setMode(new FsPermission(modeValue));
          break;
        default:
          printUsage("-update");
          return false;
        }
        i++;
      }
    } catch (IllegalArgumentException iae) {
      throw iae;
    } catch (Exception e) {
      String msg = "Unable to parse arguments: " + e.getMessage();
      if (e instanceof ArrayIndexOutOfBoundsException) {
        msg = "Unable to parse arguments: no value provided for "
            + parameters[i - 1];
      }
      throw new IOException(msg);
    }
    UpdateMountTableEntryRequest updateRequest =
        UpdateMountTableEntryRequest.newInstance(existingEntry);
    UpdateMountTableEntryResponse updateResponse =
        mountTable.updateMountTableEntry(updateRequest);
    boolean updated = updateResponse.getStatus();
    if (!updated) {
      System.err.println("Cannot update mount point " + mount);
    }
    return updated;
  }

  /**
   * Parse string to boolean.
   * @param value the string to be parsed.
   * @return parsed boolean value.
   * @throws Exception if other than true|false is provided.
   */

View on GitHub (pinned to 2add963021)

Solutions

1. Run the command with -help to see required options and formats.
2. Check for missing option values, unbalanced quotes, or unexpected flags.

When it happens

Trigger: RouterAdmin failed to parse the supplied command-line arguments.

Common situations: Malformed dfsrouteradmin invocation: missing values, unknown options, or wrong ordering.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/f8b67cd126504955. Report an issue: GitHub.