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DrunkenMoose's avatar
DrunkenMoose
Explorer | Level 3
4 years ago

Dropbox upload session append - incorrect offset

Hey,   I'm working on a dropbox upload function in java (coldfusion). The simpel upload works perfectly, but I'm having troubles with the session upload. Here is what I try to do:   >I have an im...
API
Greg-DB's avatar
Greg-DB
Icon for Dropbox Staff rankDropbox Staff

If the first /2/files/upload_session/append_v2 call is failing with 'incorrect_offset', and indicating a 'correct_offset' of 8024827 for that upload session, then that indicates that the API received that much data for that upload session in the /2/files/upload_session/start call. That is, the 'correct_offset' value indicates how much data the API has received so far for that upload session. If this number is higher than expected, it's likely that your code is accidentally sending more data per call than you intended.

 

I recommend debugging your code for calling /2/files/upload_session/start to make sure you're only sending as much data as you intended, i.e., "4194304 KB" in this case, from your description. (By the way, did you mean bytes instead of KB? 4 MB = 4194304 bytes, not KB.)

 

Also, it makes sense that it would work if you use a chunk size of 150 MB for a 20 MB file, since you would be uploading the entire file in the /2/files/upload_session/start call, and so wouldn't need to use /2/files/upload_session/append_v2, so the offset value doesn't need to be checked.

DrunkenMoose's avatar
DrunkenMoose
Explorer | Level 3
4 years ago

Hey,

 

I posted a whole reply, but it get removed? But now I see that len(chunk) does not represent the correct bit length.

You actually have to put the chunks in a ByteBuffer to correctly split it in the 4mb chunks. Weird how len(chunk)

is exatly devided by 2, somehow this is actually 8mb. But thanks for the reply and the info! Now it's working great.

 

Greetings,

Moose

  • Greg-DB's avatar
    Greg-DB
    Icon for Dropbox Staff rankDropbox Staff
    4 years ago

    Thanks for following up. I'm glad to hear you already sorted this out. (Your other message got caught in the spam filter for some reason. I've restored it.)

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