apache/hadoop · error · IOException

Unknown encryption algorithm <name>

Error message

Unknown encryption algorithm <name>

What it means

Error "Unknown encryption algorithm <name>" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AEncryptionMethods.java:105

    return requiresSecret;
  }

  /**
   * Get the encryption mechanism from the value provided.
   * @param name algorithm name
   * @return the method
   * @throws IOException if the algorithm is unknown
   */
  public static S3AEncryptionMethods getMethod(String name) throws IOException {
    if(StringUtils.isBlank(name)) {
      return NONE;
    }
    for (S3AEncryptionMethods v : values()) {
      if (v.getMethod().equalsIgnoreCase(name)) {
        return v;
      }
    }
    throw new IOException(UNKNOWN_ALGORITHM + name);
  }

}

View on GitHub (pinned to 2add963021)

Solutions

1. Set fs.s3a.encryption.algorithm to a supported value: CSE-KMS, CSE-CUSTOM, SSE-S3, SSE-KMS, or SSE-C.

When it happens

Trigger: Thrown at hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AEncryptionMethods.java:105 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/76047a6c15c6d0c9. Report an issue: GitHub.