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minio/docs/backend-multipart.md

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## 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```