apache/hadoop · error · UnsupportedFileSystemException

%s=null: %s: %s

Error message

%s=null: %s: %s

What it means

Error "%s=null: %s: %s" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/AbstractFileSystem.java:176

   * conf is used to find the class name that implements the file system. The
   * conf is also passed to the file system for its configuration.
   *
   * @param uri URI of the file system
   * @param conf Configuration for the file system
   * 
   * @return Returns the file system for the given URI
   *
   * @throws UnsupportedFileSystemException file system for <code>uri</code> is
   *           not found
   */
  public static AbstractFileSystem createFileSystem(URI uri, Configuration conf)
      throws UnsupportedFileSystemException {
    final String fsImplConf = String.format("fs.AbstractFileSystem.%s.impl",
        uri.getScheme());

    Class<?> clazz = conf.getClass(fsImplConf, null);
    if (clazz == null) {
      throw new UnsupportedFileSystemException(String.format(
          "%s=null: %s: %s",
          fsImplConf, NO_ABSTRACT_FS_ERROR, uri.getScheme()));
    }
    return (AbstractFileSystem) newInstance(clazz, uri, conf);
  }

  /**
   * Get the statistics for a particular file system.
   * 
   * @param uri
   *          used as key to lookup STATISTICS_TABLE. Only scheme and authority
   *          part of the uri are used.
   * @return a statistics object
   */
  protected static synchronized Statistics getStatistics(URI uri) {
    String scheme = uri.getScheme();
    if (scheme == null) {
      throw new IllegalArgumentException("Scheme not defined in the uri: "

View on GitHub (pinned to 2add963021)

Solutions

1. The URI lacks the required component; supply a complete URI with scheme and authority.

Example fix

Use hdfs://namenode:8020/... instead of a bare path.

When it happens

Trigger: Raised at runtime when the documented precondition or configuration requirement for this operation is violated.

Common situations: Misconfigured or missing property, invalid user input, or calling the API before its prerequisites are met.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/584e17578b8666e2. Report an issue: GitHub.