Description of problem:After executing the  enable_stretch_mode  command twice getting different messages.

[root@ceph-bharath-1603163288685-node1-monmgrinstaller cephuser]# /bin/ceph mon enable_stretch_mode ceph-bharath-1603163288685-node6-mon stretch_rule datacenter

Error EINVAL: the 2 datacenterinstances in the cluster have differing weights 5372 and 4062 but stretch mode currently requires they be the same!

[root@ceph-bharath-1603163288685-node1-monmgrinstaller cephuser]# /bin/ceph mon enable_stretch_mode ceph-bharath-1603163288685-node6-mon stretch_rule datacenter

stretch mode currently committing

At first time when executing the command getting the Error message and second time when I ran getting message as stretch mode is currently committing.



Version-Release number of selected component (if applicable):
[root@ceph-bharath-1603163288685-node1-monmgrinstaller cephuser]# ceph versions
{
    "mon": {
        "ceph version 14.2.11-55.el8cp (a88999020b8767a4c384efbc8f9c061e95e78051) nautilus (stable)": 3
    },
    "mgr": {
        "ceph version 14.2.11-55.el8cp (a88999020b8767a4c384efbc8f9c061e95e78051) nautilus (stable)": 1
    },
    "osd": {
        "ceph version 14.2.11-55.el8cp (a88999020b8767a4c384efbc8f9c061e95e78051) nautilus (stable)": 28
    },
    "mds": {},
    "overall": {
        "ceph version 14.2.11-55.el8cp (a88999020b8767a4c384efbc8f9c061e95e78051) nautilus (stable)": 32
    }
}



How reproducible:


Steps to Reproduce:

bin/ceph config set osd osd_crush_update_on_start false
/bin/ceph osd crush move osd.0 host=host1-1 datacenter=site1
/bin/ceph osd crush move osd.1 host=host1-2 datacenter=site1
/bin/ceph osd crush move osd.2 host=host2-1 datacenter=site2
/bin/ceph osd crush move osd.3 host=host2-2 datacenter=site2
/bin/ceph osd getcrushmap > crush.map.bin
/bin/crushtool -d crush.map.bin -o crush.map.txt
cat <<EOF >> crush.map.txt
rule stretch_rule {
        id 1
        type replicated
        min_size 1
        max_size 10
        step take site1
        step chooseleaf firstn 2 type host
        step emit
        step take site2
        step chooseleaf firstn 2 type host
        step emit
}
EOF


/bin/crushtool -c crush.map.txt -o crush2.map.bin
/bin/ceph osd setcrushmap -i crush2.map.bin
/bin/ceph mon set election_strategy connectivity
/bin/ceph mon set_location a datacenter=site1
/bin/ceph mon set_location ceph-bharath-1601914071234-node6-mon datacenter=site1
/bin/ceph mon set_location ceph-bharath-1601914071234-node1-monmgrinstaller datacenter=site2
/bin/ceph mon set_location ceph-bharath-1601914071234-node2-mon datacenter=site3
/bin/ceph osd pool create test_stretch1 8 8 replicated

/bin/ceph mon enable_stretch_mode ceph-bharath-1601914071234-node2-mon stretch_rule datacenter

Actual results:
1.Getting error message as first time
2.cluster committing in to stretch mode 

Expected results:

Need to show proper message 

Additional info: