apache/hadoop · error · IOException

Failed to sync ${dir}

Error message

Failed to sync ${dir}

What it means

Error "Failed to sync ${dir}" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/LocalReplica.java:536

    //update metaFile
    try (RandomAccessFile metaRAF = fileIoProvider.getRandomAccessFile(
        volume, metaFile, "rw")) {
      metaRAF.setLength(newmetalen);
      metaRAF.seek(newmetalen - checksumsize);
      metaRAF.write(b, 0, checksumsize);
    }
  }

  /**
   * Sync the parent directory changes to durable device.
   * @throws IOException
   */
  public void fsyncDirectory() throws IOException {
    File dir = getDir();
    try {
      getFileIoProvider().dirSync(getVolume(), getDir());
    } catch (IOException e) {
      throw new IOException("Failed to sync " + dir, e);
    }
  }
}

View on GitHub (pinned to 2add963021)

Solutions

1. Check disk health and filesystem errors on the volume containing the directory; fsync failures usually indicate failing hardware.
2. Ensure the filesystem is not full and the mount is still writable.

When it happens

Trigger: Calling sync/fsync on a replica directory fails, typically due to I/O errors on the underlying disk.

Common situations: Syncing a storage directory to disk failed, a strong signal of disk or filesystem trouble. Check dmesg and volume health immediately.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/0c3cf31fa00caf21. Report an issue: GitHub.