{"record":{"id":"dfde9eb30400becf","repo":"apache/hadoop","slug":"unsupported-verifier-flavor","errorCode":null,"errorMessage":"Unsupported verifier flavor: ","messagePattern":"Unsupported verifier flavor: ","errorType":"exception","errorClass":"UnsupportedOperationException","httpStatus":null,"severity":"error","filePath":"hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/security/Verifier.java","lineNumber":53,"sourceCode":"   * Read both AuthFlavor and the verifier from the XDR.\n   * @param xdr XDR message\n   * @return verifier\n   */\n  public static Verifier readFlavorAndVerifier(XDR xdr) {\n    AuthFlavor flavor = AuthFlavor.fromValue(xdr.readInt());\n    final Verifier verifer;\n    if (flavor == AuthFlavor.AUTH_NONE) {\n      verifer = new VerifierNone();\n    } else if (flavor == AuthFlavor.AUTH_SYS) {\n      // Added in HADOOP-15307 based on HDFS-5085:\n      // When the auth flavor is AUTH_SYS, the corresponding verifier is\n      // AUTH_NONE. I.e., it is impossible to have a verifier with auth\n      // flavor AUTH_SYS.\n      verifer = new VerifierNone();\n    } else if (flavor == AuthFlavor.RPCSEC_GSS) {\n      verifer = new VerifierGSS();\n    } else {\n      throw new UnsupportedOperationException(\"Unsupported verifier flavor: \"\n          + flavor);\n    }\n    verifer.read(xdr);\n    return verifer;\n  }\n\n  /**\n   * Write AuthFlavor and the verifier to the XDR.\n   * @param verifier written to XDR\n   * @param xdr XDR message\n   */\n  public static void writeFlavorAndVerifier(Verifier verifier, XDR xdr) {\n    if (verifier instanceof VerifierNone) {\n      xdr.writeInt(AuthFlavor.AUTH_NONE.getValue());\n    } else if (verifier instanceof VerifierGSS) {\n      xdr.writeInt(AuthFlavor.RPCSEC_GSS.getValue());\n    } else {\n      throw new UnsupportedOperationException(\"Cannot recognize the verifier\");","sourceCodeStart":35,"sourceCodeEnd":71,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/security/Verifier.java#L35-L71","documentation":"Error \"Unsupported verifier flavor: \" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/security/Verifier.java:53 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Use a supported verifier flavor (e.g. AUTH_NONE or RPCSEC_GSS) on the RPC client.","Check for corrupted RPC messages; an unknown verifier flavor often indicates malformed or foreign traffic.","Verify client and server are configured with compatible authentication settings."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}