apache/hadoop · error · EOFException

Cannot seek to a negative offset

Error message

Cannot seek to a negative offset

What it means

Error "Cannot seek to a negative offset" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/OSSDataBlocks.java:799

          if (byteBuffer == null) {
            throw new IOException(FSExceptionMessages.STREAM_IS_CLOSED);
          }
        }

        public synchronized int read() throws IOException {
          if (available() > 0) {
            return byteBuffer.get() & 0xFF;
          } else {
            return -1;
          }
        }

        @Override
        public synchronized long skip(long offset) throws IOException {
          verifyOpen();
          long newPos = position() + offset;
          if (newPos < 0) {
            throw new EOFException(FSExceptionMessages.NEGATIVE_SEEK);
          }
          if (newPos > size) {
            throw new EOFException(FSExceptionMessages.CANNOT_SEEK_PAST_EOF);
          }
          byteBuffer.position((int) newPos);
          return newPos;
        }

        @Override
        public synchronized int available() {
          Preconditions.checkState(byteBuffer != null,
              FSExceptionMessages.STREAM_IS_CLOSED);
          return byteBuffer.remaining();
        }

        /**
         * Get the current buffer position.
         * @return the buffer position

View on GitHub (pinned to 2add963021)

Solutions

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

When it happens

Trigger: Thrown at hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/OSSDataBlocks.java:799 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/4e3ef87f563aa373. Report an issue: GitHub.