Ceph » RADOS

Hi,

In Gnocchi, with use the python-rados API and we recently encounter some data corruption when "rados_osd_op_timeout" is set.
After digging, we end up that aio_read() doesn't return the expected data and doesn't return any error.

The issue on Gnocchi side: https://github.com/gnocchixyz/gnocchi/pull/190
This have been workarounded by doing read() instead of aio_read()

Ceph version was 10.2.7, but I can reproduce it on many other version.

I have attached a script to reproduce, it actual outputs:

no timeout read(): 'my fancy blob' : True
 with timeout read(): 'my fancy blob' : True
 no timeout aio_read(): 'my fancy blob' (length or errno: 13): True
 with timeout aio_read(): 'exc_traceback' (length or errno: 13): False

The last line shows that aio_read doesn't return the expected blob.