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Forum Discussion
parallel upload failing - "lookup_failed/incorrect_offset"
we need to upload large files (several GiB) to dropbox using the API. i've written a script that uses cURL to do this in parallel. i upload the first segment of 150M in order to obtain the session ID...
Greg-DB
Dropbox Staff
Dropbox StaffBy default, upload sessions only accept the data sequentially, meaning the app needs to only upload the pieces of the file for an upload session one by one in order.
You can upload in parallel if you want, but you need to set session_type:concurrent and follow a few other constraints. Please refer to the /2/files/upload_session/start documentation for information on using that.
thanks Greg-DB, i missed that in the docs. this looks promising, i'll give it a try.
one question : since /upload_session/finish in a concurrent upload won't accept file data along with it, what should the offset be in the cursor data for this case ? the total number of bytes already sent with previous calls (i.e. the file size) ? 0 ? ...or maybe it's ignored ?
- Greg-DB
Yes, for the offset on the /finish call for a concurrent upload session you should supply the total number of bytes successfully sent for the session previously (i.e., the total length of the file).
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