minio/docs/backend-multipart.md

Multipart

Each incoming part is uploaded in the following format.

Placeholder uploads.json to indicate a leaf.

EXPORT_DIR/.minio/multipart/BUCKET/PATH/TO/OBJECT/uploads.json

Incomplete file

EXPORT_DIR/.minio/multipart/BUCKET/PATH/TO/OBJECT/UPLOADID/00000.incomplete

Actual parts

EXPORT_DIR/.minio/multipart/BUCKET/PATH/TO/OBJECT/UPLOADID/PART_NUMBER.MD5SUM_STRING

FS Format.

Each of these parts are concatenated back to a single contigous file.

EXPORT_DIR/BUCKET/PATH/TO/OBJECT

XL Format.

Each of these parts are kept as is in the following format.

Special json file indicate the metata multipart information, essentially list of parts etc.

EXPORT_DIR/BUCKET/PATH/TO/OBJECT/00000.minio.multipart

All the parts that were uploaded.

EXPORT_DIR/BUCKET/PATH/TO/OBJECT/PART_NUMBER.minio.multipart