apache/hadoop · error · EOFException

Cannot seek at negative position:{pos}

Error message

Cannot seek at negative position:{pos}

What it means

Error "Cannot seek at negative position:{pos}" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSInputStream.java:91

    this.expectNextPos = 0;
    this.lastByteStart = -1;
    reopen(0);
    closed = false;
  }

  /**
   * Reopen the wrapped stream at give position, by seeking for
   * data of a part length from object content stream.
   *
   * @param pos position from start of a file
   * @throws IOException if failed to reopen
   */
  private synchronized void reopen(long pos) throws IOException {
    long partSize;

    if (pos < 0) {
      throw new EOFException("Cannot seek at negative position:" + pos);
    } else if (pos > contentLength) {
      throw new EOFException("Cannot seek after EOF, contentLength:" +
          contentLength + " position:" + pos);
    } else if (pos + downloadPartSize > contentLength) {
      partSize = contentLength - pos;
    } else {
      partSize = downloadPartSize;
    }

    if (this.buffer != null) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("Aborting old stream to open at pos " + pos);
      }
      this.buffer = null;
    }

    boolean isRandomIO = true;
    if (pos == this.expectNextPos) {

View on GitHub (pinned to 2add963021)

Solutions

1. Pass a non-negative position to seek(); fix the caller to clamp the position to 0 or greater before seeking.

When it happens

Trigger: Thrown at hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/AliyunOSSInputStream.java:91 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/fed83ef6efc77d82. Report an issue: GitHub.