https://bugzilla.wikimedia.org/show_bug.cgi?id=36587

--- Comment #9 from Erik Moeller <e...@wikimedia.org> 2012-08-29 22:09:05 UTC 
---
OK, now that we're through most of the Swift migration, we should pick this one
up again.

This still occurs and is easily reproducible by uploading a 300-400MB file to
Commons via Upload Wizard with chunked uploading enabled.

Looking at the API responses in details, what happens is that there's a final
chunk API request which results in a "Wikimedia Error" webpage response like
this:

Request: POST http://commons.wikimedia.org/w/api.php, from 208.80.154.134 via
cp1002.eqiad.wmnet (squid/2.7.STABLE9) to 10.64.0.125 (10.64.0.125)<br/>
Error: ERR_READ_TIMEOUT, errno [No Error] at Wed, 29 Aug 2012 21:46:36 GMT

Upload Wizard then seems to attempt to re-upload the same chunk again, with the
following response code:

{"servedby":"mw65","error":{"code":"internal_api_error_UploadChunkFileException","info":"Exception
Caught: error storing file in '\/tmp\/phpRWwfF6': backend-fail-alreadyexists;
mwstore:\/\/local-swift\/local-temp\/5\/57\/10tlhjb3zs7o.4nm7i9.28.ogx.490","*":""}

This response code is then surfaced through the UI.

So it looks like the chunk re-assembly for large files is still timing out
somewhere.

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