apache/hadoop · error · SaslException

PLAIN auth failed:

Error message

PLAIN auth failed: 

What it means

Error "PLAIN auth failed: " thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslPlainServer.java:109

      String[] parts = payload.split("\u0000", 3);
      if (parts.length != 3) {
        throw new IllegalArgumentException("Received corrupt response");
      }
      if (parts[0].isEmpty()) { // authz = authn
        parts[0] = parts[1];
      }
      
      NameCallback nc = new NameCallback("SASL PLAIN");
      nc.setName(parts[1]);
      PasswordCallback pc = new PasswordCallback("SASL PLAIN", false);
      pc.setPassword(parts[2].toCharArray());
      AuthorizeCallback ac = new AuthorizeCallback(parts[1], parts[0]);
      cbh.handle(new Callback[]{nc, pc, ac});      
      if (ac.isAuthorized()) {
        authz = ac.getAuthorizedID();
      }
    } catch (Exception e) {
      throw new SaslException("PLAIN auth failed: " + e.toString(), e);
    } finally {
      completed = true;
    }
    return null;
  }

  private void throwIfNotComplete() {
    if (!completed) {
      throw new IllegalStateException("PLAIN authentication not completed");
    }
  }
  
  @Override
  public boolean isComplete() {
    return completed;
  }

  @Override

View on GitHub (pinned to 2add963021)

Solutions

1. Verify the username and password/token used for PLAIN authentication are correct.
2. Check the server-side secret manager for expired or invalid tokens and re-issue them.
3. Ensure the client principal matches what the server expects for this connection.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslPlainServer.java:109 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/ea61117b83fe14bf. Report an issue: GitHub.