apache/hadoop · error · IOException

reset not implemented.

Error message

reset not implemented.

What it means

Error "reset not implemented." thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/HarFileSystem.java:965

      
      @Override
      public synchronized  void close() throws IOException {
        underLyingStream.close();
        super.close();
      }
      
      //not implemented
      @Override
      public void mark(int readLimit) {
        // do nothing 
      }
      
      /**
       * reset is not implemented
       */
      @Override
      public void reset() throws IOException {
        throw new IOException("reset not implemented.");
      }
      
      @Override
      public synchronized int read() throws IOException {
        int ret = read(oneBytebuff, 0, 1);
        return (ret <= 0) ? -1: (oneBytebuff[0] & 0xff);
      }
      
      // NB: currently this method actually never executed because
      // java.io.DataInputStream.read(byte[]) directly delegates to 
      // method java.io.InputStream.read(byte[], int, int).
      // However, potentially it can be invoked, so leave it intact for now.
      @Override
      public synchronized int read(byte[] b) throws IOException {
        final int ret = read(b, 0, b.length);
        return ret;
      }
      

View on GitHub (pinned to 2add963021)

Solutions

1. Do not call reset() on HarFileSystem streams; close and reopen the stream to re-read.
2. Track position manually and use seek where supported.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/HarFileSystem.java:965 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/c5ec84fda478b24a. Report an issue: GitHub.