minio/Multipart.md

Multipart backend format

When multipart upload is used for objects, below meta-data/staging files are created

• New multipart upload call creates file EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.uploadid
• Put object part call creates file EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.PART_NUMBER.MD5SUM_STRING
• Abort multipart call removes all files matching EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.*
• Complete multipart call does
  1. Create a staging file EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.complete.TEMP_NAME then rename to EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.complete
  2. Rename staging file EXPORT_DIR/.minio/BUCKET/PATH/TO/OBJECT/UPLOAD_ID.complete to EXPORT_DIR/BUCKET/PATH/TO/OBJECT