Description of problem:
=======================
while updating rgw node from 2.0 to 2.0 async, script running I/O failed


  upload part 13 size 52428800
    upload part 14 size 52428800
    upload part 15 size 52428800
    upload part 16 size 52428800
    upload part 17 size 52428800
    upload part 18 size 52428800



Traceback (most recent call last):
  File "s3test.py", line 41, in <module>
    part.upload_part_from_file(fp = fp, part_num = n, size = size)
  File "/usr/lib/python2.7/dist-packages/boto/s3/multipart.py", line 260, in upload_part_from_file
    query_args=query_args, size=size)
  File "/usr/lib/python2.7/dist-packages/boto/s3/key.py", line 1293, in set_contents_from_file
    chunked_transfer=chunked_transfer, size=size)
  File "/usr/lib/python2.7/dist-packages/boto/s3/key.py", line 750, in send_file
    chunked_transfer=chunked_transfer, size=size)
  File "/usr/lib/python2.7/dist-packages/boto/s3/key.py", line 951, in _send_file_internal
    query_args=query_args
  File "/usr/lib/python2.7/dist-packages/boto/s3/connection.py", line 664, in make_request
    retry_handler=retry_handler
  File "/usr/lib/python2.7/dist-packages/boto/connection.py", line 1071, in make_request
    retry_handler=retry_handler)
  File "/usr/lib/python2.7/dist-packages/boto/connection.py", line 1028, in _mexe
    raise BotoServerError(response.status, response.reason, body)
boto.exception.BotoServerError: BotoServerError: 400 Bad Request


Version-Release number of selected component (if applicable):
=============================================================
update from 2.0 GA to 10.2.2-32redhat1xenial


How reproducible:
================
intermittent


Steps to Reproduce:
===================

1. create ubuntu ceph cluster (ceph 2.0 GA bits)
2. create rgw multisite setup
3. run I/O from rgw client
4. update cluster to 2.0 async (primary cluster first and then secondary)

Actual results:
===============
found  I/O failures while updating rgw on primary cluster