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doc: add multipart documentation about staging files

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Bala FA 2016-04-06 08:26:19 +05:30 committed by Harshavardhana
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## 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```