[radosgw] Race condition corrupting data on COPY ?

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Hi,


I've just noticed something rather worrying on our cluster.

Some files are apparently truncated. From the first look I had at it,
it happened on files where there was a metadata update right after the
file was stored. The exact sequence was:

 - PUT to store the file
 - GET to get the file (which at that point is still correct and has
the proper length)
 - PUT using a 'copy source' over itself to update the metadata

all of theses happening sequentially in the same second, very quickly.

Then subsequent GET return a truncated file.


I'm looking into it to narrow down the issue but I wanted to know if
anyone had seen something similar ?


Cheers,

     Sylvain
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