Thanks for this info. Sorry it's so difficult, and I'll look to see what we
might have to help. One thing I worked on was NDB migration. There's a
sample at
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/master/appengine/standard/migration/ndb/overview
.
Basically, you use from google.cloud import ndb instead of the old import,
create a global client with something like "client = ndb.Client()", and
then wrap your old NDB operations in a context:
with client.context():
do_old_ndb_operation
This works fine under Python 2.7 and Python 3. There seems to be a
performance hit when you use this library under Python 2.7, though it might
not matter unless you are database-bound. I've been doing benchmarks, and
the performance seems to return to normal when you use this in Python 3.
If you are already using a Redis cache, it's easy to add that to the new
NDB by adding the parameter global_cache=redis_cache_client to the
client.context calls. Using that cache may not make much difference either
way, though; it depends on the pattern of database access specific to your
usage.
Charlie
On Tue, Jun 23, 2020 at 12:14 PM alexander noteboom <[email protected]>
wrote:
> We are in the middle of the migration. It is a horrible experience.
> We tried to break it into small steps.
> Still in python2, we first replaced memcache with redis and replaced
> search with elasticsearch. These steps were do-able.
>
> Next we tried to make the python2 code compatible with python3 using
> futurize. Had a lot of problems with future_builtins and unicode, so we
> futurized except those.
>
>
> After that we tried to migrate to Cloud Tasks, but that failed horrible
> because of the lack of transactional tasks. Our application heavily relies
> on that.
> We thought up a solution, but that required the migration to Cloud ndb. So
> we have to combine these two steps.
>
> That is where we currently are. Fighting with Cloud Tasks, Cloud NDB,
> namespaces, and getting it running using python3 on a local machine.
> The most annoying thing is that there is no local Task Emulator available,
> and no Datastore Emulator viewer available.
>
>
> On Tuesday, 5 May 2020 23:06:48 UTC+2, Charlie Engelke wrote:
>>
>> This is very helpful feedback. Anybody else have comments for us?
>>
>> On Tuesday, May 5, 2020 at 1:17:52 PM UTC-7 Charlie Engelke wrote:
>>
>>> I'd still like to here anyone's stories involving migrating their App
>>> Engine apps from Python 2.7 to Python 3.7. Have you migrated yet? Planning
>>> to do so soon? Not going to move to the new platform?
>>>
>>> And any particular pain points? Things that would have helped?
>>>
>>> Thanks,
>>>
>>> Charlie
>>>
>>> On Friday, May 1, 2020 at 2:18:33 PM UTC-7 Charlie Engelke wrote:
>>>
>>>> Have you recently migrated from App Engine for Python 2.7 to App Engine
>>>> for Python 3.7? Are you working on migrating now, or planning to soon? Or
>>>> maybe you are using App Engine for Python 2.7 and aren't planning such a
>>>> migration.
>>>>
>>>> In each of those cases, I'd like to hear how things went or are going
>>>> for you, pain points you encounter, things that went easily, and anything
>>>> else you have to share. I'm working on creating some new code samples to
>>>> help with this, and your stories will be a big help.
>>>>
>>>> Thanks,
>>>>
>>>> Charlie
>>>>
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--
Charles Engelke
GCP AppDev DPE
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