[ovirt-devel] Vdsm sync 5/1 summary after short delay

[Nir Soffer]

On Sun, Jan 10, 2016 at 2:57 PM, Oved Ourfali <oourfali at redhat.com> wrote:
> Thanks for the summary!
> See one comment inline.
>
> On Sun, Jan 10, 2016 at 2:49 PM, Yaniv Bronheim <ybronhei at redhat.com> wrote:
>>
>>
>> (fromani, nsoffer, ybronhei, alitke)
>>
>>  - Removing xmlrpc for good - who should accept it? where do we stand with
>> full jsonrpc client ? (we didn't get to any conclusions and said that we'll
>> reraise this topic next week with pioter)
>>
>
> With regards to that, in order to move to 3.6 cluster level, you MUST have
> all hosts in jsonrpc protocol. So, we just need to make sure no piece of
> code uses that explicitly, and if so move that to jsonrpc as well.

I don't remember that this was discussed here, and storage never
approved this change
for 3.6.  We need to keep the xmlrpc option in 3.6, as a backup for
jsonrpc issues.

We just fixed couple of jsonrpc verbs that were returning True instead of
the correct return value (caused by incorrect schema).
- https://github.com/oVirt/vdsm/commit/0ca680700596564b4d6b0ef01ed4b0ae7c488de7
- https://gerrit.ovirt.org/40402 VM.getDiskAlignment cannot be used in jsonrpc

However this is not the topic of the discussion, we are discussion the next
version (3.7/4.0). We are adding lot of new verbs as part of removing the spm,
and we don't want to invest time in adding xmlrpc and vdsClient support.

Example new verb merged recently:
https://github.com/oVirt/vdsm/commit/bbbb72a192d8b54d21c8d65f6a10278404a966db

In the new verbs, we cleaned up the api, so integer values are passed
as integers,
not as strings. Previously we use to require strings since xmlrpc did
not support large
numbers (> 2**31 - 1).

So in the schema, we require now a uint:

+##
+# @CreateVolumeInfo:
+#
...
+# @virtual_size: The Volume size in bytes
...
+# @initial_size: #optional If specified, the initial allocated size of volume
+# in bytes. Allowed only when creating a thinly provisioned
+# volume on block storage.
+#
+# Since: 4.18
+##
+{'type': 'CreateVolumeInfo',
+ 'data': {'sd_id': 'UUID', 'img_id': 'UUID', 'vol_id': 'UUID',
+ 'virtual_size': 'uint', 'vol_format': 'VolumeFormat',
+ 'disk_type': 'DiskType', 'description': 'str',
+ '*parent_img_id': 'UUID', '*parent_vol_id': 'UUID',
+ '*initial_size': 'uint'}}

To support xmlrpc, we added this ugly code in bindingxmlrpc.py:

+ def sdm_create_volume(self, args):
+ validateArgTypes(args, [str, parse_json_obj])
+
+ # Convert large integers to strings. The server's xmlrpc binding will
+ # restore them to their proper int types.
+ vol_info = args[1]
+ for param in 'virtual_size', 'initial_size':
+ if param in vol_info:
+ vol_info[param] = str(vol_info[param])
+
+ res = self.s.sdm_create_volume(*args)
+ if res['status']['code']:
+ return res['status']['code'], res['status']['message']
+
+ return 0, ''
+

To support vdsClient, we added this:

+ def sdm_create_volume(self, job_id, vol_info):
+ sdm = API.SDM()
+
+ # As a workaround for the 32bit signed integer limitation of xmlrpc,
+ # allow large integers to be passed as strings. We convert them back
+ # to the correct type here.
+ for param in 'virtual_size', 'initial_size':
+ if param in vol_info:
+ vol_info[param] = int(vol_info[param])
+
+ return sdm.create_volume(job_id, vol_info)
+

All this work is waste effort on our side.

We should make a decision now - do we support xmlrpc in vdsm?

I think we should not support it, after two version we support both
xmlrpc and jsonrpc.

If we stop supporting xmlrpc, we must have a replacement for vdsClient,

We need to have commnad line client, both for development, and for sos
plugin. I think this patch, owned now by Piotr, is the best direction:
https://gerrit.ovirt.org/35181/

But we need to give this high priority, as having a command line client is
a must for developing vdsm.

Adding Aharon - supporting both xmlrpc and jsonrpc means we need to test
everything twice,  I don't think Aharion will like to do that.

Piotr, Francesco, Dan, Adam: your thoughts?

>>
>>  - Moving from nose to pytest - generally good approach to achieve. It
>> requires some changes in current testlib.py code. must be an item for next
>> major version (nir already managed to run most of the tests with it, and
>> stated few gaps)
>>
>>  - Exception patches - still on progress, please review
>> (https://gerrit.ovirt.org/48868)
>>
>>  - python3 effort to cover all asyncProc usage, and allowing utils import
>> without having python3-cpopen - https://gerrit.ovirt.org/51421
>> https://gerrit.ovirt.org/49441 . still under review
>>
>> We didn't take notes during that talk, so if I forgot to mention something
>> I apologize. Feel free to reply and raise it
>>
>> Greetings,
>>
>> --
>> Yaniv Bronhaim.
>>
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