Description of problem:
Active-actve multisite configuration. Test sample set includes swift and S3 buckets and objects with file size ranging from a few kilobytes to a couple of gigabytes. Most often the sync fails.. Radosgw service has to be restarted and the sync succeeds


Version-Release number of selected component (if applicable):
ceph-radosgw-10.1.1-1.el7cp.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Configure a master zone and a secondary zone Create buckets and containers on master zone. Upload a couple of small files from one of the zones.
2. Check if the files have synced to the peer zone. 
3. Check the sync status on the destination zone and look for errors in rgw logs. 

Actual results:
Some files fail to sync. At this point any more object operations do not sync to peer. But after a radosgw restart, they succeed. 


Expected results:
The sync should not fail. Restarting radosgw everytime is not expected.

Additional info:

One of the containers that was not synced was test-container.

source rgw1 node:

# swift -A http://rgw1:8080/auth/1.0 -U test-user:swift -K 'kzmbCQgR3L5CqjQmvjatXLjeZi1Ss8RFlWLGu1Vj' list | grep test-container
test-container

Destination rgw2 node:

# swift -A http://rgw2:8080/auth/1.0 -U test-user:swift -K 'kzmbCQgR3L5CqjQmvjatXLjeZi1Ss8RFlWLGu1Vj' list | grep test-container
#

# radosgw-admin sync status --rgw-zone=us-2 --debug-rgw=0 --debug-ms=0
          realm 4e00a610-36e9-43d0-803e-4001442b8232 (earth)
      zonegroup e66e1293-e63b-4afe-9dad-3397647dfb03 (us)
           zone 001da65b-c3a8-42e2-a1ce-79cacefbace2 (us-2)
  metadata sync syncing
                full sync: 0/64 shards
                incremental sync: 64/64 shards
                metadata is behind on 2 shards
                oldest incremental change not applied: 2016-04-15 09:30:31.0.670191s
      data sync source: acadcc66-10b9-4829-b8e2-306c0048bff5 (us-1)
                        syncing
                        full sync: 0/128 shards
                        incremental sync: 128/128 shards
                        data is behind on 1 shards
                        oldest incremental change not applied: 2016-04-15 10:06:35.0.959384s


After a radosgw restart on rgw2 node, the test-container is created.

# radosgw-admin sync status --rgw-zone=us-2 --debug-rgw=0 --debug-ms=0

          realm 4e00a610-36e9-43d0-803e-4001442b8232 (earth)
      zonegroup e66e1293-e63b-4afe-9dad-3397647dfb03 (us)
           zone 001da65b-c3a8-42e2-a1ce-79cacefbace2 (us-2)
  metadata sync syncing
                full sync: 0/64 shards
                metadata is caught up with master
                incremental sync: 64/64 shards
      data sync source: acadcc66-10b9-4829-b8e2-306c0048bff5 (us-1)
                        syncing
                        full sync: 0/128 shards
                        incremental sync: 128/128 shards
                        data is caught up with source