About Protocol Buffers

Sean Cribbs sean at basho.com
Tue Jun 24 09:35:45 EDT 2014


Alex,

Not all Riak 2.0 features have been merged to master on the Python client,
including CRDTs. We are in final testing of that feature and will have a
release candidate package of the client out soon.


On Tue, Jun 24, 2014 at 5:26 AM, Alex De la rosa <alex.rosa.box at gmail.com>
wrote:

> Hi Luc,
>
> I tried your new solution and gives the same error. The problem is that
> .bucket_type() doesn't exist:
>
> Traceback (most recent call last):
>   File "test.py", line 18, in <module>
>     bucket = client.bucket_type('counters').bucket('likes')
> AttributeError: 'RiakClient' object has no attribute 'bucket_type'
>
> I have Riak 2.0.0beta1 and riak-2.0.3-py2.7.egg as Python library.
>
> Thanks,
> Alex
>
>
> On Tue, Jun 24, 2014 at 11:44 AM, Luc Perkins <lperkins at basho.com> wrote:
>
>> Alex,
>>
>> There's a mistake in that tutorial that I need to fix. Early in the
>> tutorial I instruct you to create a bucket type called *counters*, and
>> then later on I use the name *counter_bucket*. Silly mistake on my part.
>> If you establish that as the bucket type, it should work:
>>
>> *bucket = client.bucket_type('counters').bucket('likes')*
>>
>> Also be aware that you can call a bucket type that you set up to use
>> counters anything that you'd like. The only reserved term for bucket types
>> is *default*.
>>
>> Luc
>>
>>
>> On Tue, Jun 24, 2014 at 12:31 AM, Alex De la rosa <
>> alex.rosa.box at gmail.com> wrote:
>>
>>> By the way, I have the following error using PBC on Riak 2.0:
>>>
>>> test.py
>>>
>>> ------+------+------+------+------+------+------+------+------+------+------+------+------+------+------+------+------
>>> import riak
>>> client = riak.RiakClient(host ='127.0.0.1', http_port = 8098, pb_port =
>>> 8087, protocol = 'pbc')
>>> bucket = client.bucket_type('counter_bucket').bucket('likes')
>>> counter = bucket.new('Barcelona')
>>> counter.increment(5)
>>>
>>> ------+------+------+------+------+------+------+------+------+------+------+------+------+------+------+------+------
>>>
>>> OUTPUT:
>>>
>>> Traceback (most recent call last):
>>>   File "test.py", line 18, in <module>
>>>     bucket = client.bucket_type('counter_bucket').bucket('likes')
>>> AttributeError: 'RiakClient' object has no attribute 'bucket_type'
>>>
>>> What is wrong? I was following the instructions at:
>>> https://raw.githubusercontent.com/basho/basho_docs/2.0.0/source/languages/en/riak/dev/using/data-types.md
>>>
>>> Thanks,
>>> Alex
>>>
>>>
>>> On Mon, Jun 23, 2014 at 10:03 PM, Alex De la rosa <
>>> alex.rosa.box at gmail.com> wrote:
>>>
>>>> Hi Bret,
>>>>
>>>> Thanks for your reply, I had used Riak since version 0.14 via HTTP...
>>>> for 2.0 I decided to do the switch to PBC and I'm glad to hear all HTTP
>>>> calls has been migrated to PBC too :)
>>>>
>>>> Does anybody know an estimate date for version 2.0 to be out? I'm
>>>> starting a new project and I would love to be able to use 2.0 as "list"
>>>> buckets is a great feature for my needs.
>>>>
>>>> Thanks,
>>>> Alex
>>>>
>>>>
>>>>
>>>> On Mon, Jun 23, 2014 at 9:57 PM, Brett Hazen <brett at basho.com> wrote:
>>>>
>>>>> Alex -
>>>>>
>>>>> I suspect you may be looking at some older documentation.  AFAIK all
>>>>> HTTP functionality is now (Riak 2.0) supported via PBC so you can pick
>>>>> either transport or the other for all of your communication.  In the past
>>>>> there was some functionality available only via HTTP.  There are now some
>>>>> direct queries to the Solr API which are available only via HTTP, but
>>>>> that’s outside of Riak’s core [1].
>>>>>
>>>>> I’m sure those more in the know will correct me if I’ve misspoken.
>>>>>
>>>>> Brett
>>>>>
>>>>> [1] http://docs.basho.com/riak/2.0.0beta1/dev/advanced/search/
>>>>>
>>>>> On June 23, 2014 at 10:47:45 AM, Alex De la rosa (
>>>>> alex.rosa.box at gmail.com) wrote:
>>>>>
>>>>>  Hi Luc,
>>>>>
>>>>> Cool, thanks! I can see how to do it now:
>>>>>
>>>>> bucket = client.bucket_type('counter_bucket').bucket('counters')
>>>>>
>>>>> Will be checking it more to see what can I do that is not yet
>>>>> documented.
>>>>>
>>>>> The Python documentation says at one point: "Some requests are only
>>>>> valid over 'http', and will always be sent via those transports, regardless
>>>>> of which protocol is preferred.". Can I know which requests are HTTP only?
>>>>> is it for something in particular? or they will be made into PBC at some
>>>>> point?
>>>>>
>>>>> Thanks,
>>>>> Alex
>>>>>
>>>>>
>>>>> On Mon, Jun 23, 2014 at 5:29 PM, Luc Perkins <lperkins at basho.com>
>>>>> wrote:
>>>>>
>>>>>> Alex,
>>>>>>
>>>>>> It sounds like you're working mostly with the lower-level Python API
>>>>>> at the moment, but if you want to use the higher-level parts of the client
>>>>>> for interacting with Riak Data Types (sets, maps, and counters), there is a
>>>>>> tutorial here:
>>>>>>
>>>>>>
>>>>>> https://raw.githubusercontent.com/basho/basho_docs/2.0.0/source/languages/en/riak/dev/using/data-types.md
>>>>>>
>>>>>> You'll see the Python samples interspersed throughout. I know it's
>>>>>> annoying because it's just raw Markdown at the moment, but this will be
>>>>>> deployed to our normal docs site
>>>>>> <http://docs.basho.com/riak/2.0.0beta1/> soon.
>>>>>>
>>>>>> Hope that helps!
>>>>>>
>>>>>> Luc
>>>>>>
>>>>>>
>>>>>> On Mon, Jun 23, 2014 at 4:54 PM, Alex De la rosa <
>>>>>> alex.rosa.box at gmail.com> wrote:
>>>>>>
>>>>>>> Hi Sean,
>>>>>>>
>>>>>>> Thanks for your quick reply, is what i suspected, moreover after
>>>>>>> checking riak.proto file in the source. So mainly the contents to store
>>>>>>> (json or not json) is not PB encoded semantically, but is encoded as a
>>>>>>> "body" field in the Message. That's good though.
>>>>>>>
>>>>>>> Another question... is there any estimated date for Riak 2.0 to be
>>>>>>> released? I'm playing with 2.0 beta 1 and the "list" object is a must-have
>>>>>>> for me (same as the "counter" object that can be found in Riak 1.4).
>>>>>>>
>>>>>>> Is crucial for me to decide which technologies to use in my new
>>>>>>> project; so far Riak 2.0 seems a great option, but I can not build under a
>>>>>>> beta.
>>>>>>>
>>>>>>> Another question now that I talk about "counters"... how do you do
>>>>>>> it with Python's PBC? I can see the functions: RiakClient.get_counter()
>>>>>>> and RiakClient.update_counter()... but... how do you create a new counter?
>>>>>>> how do you specify the special connotations to the bucket?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Alex
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Jun 23, 2014 at 4:38 PM, Sean Cribbs <sean at basho.com> wrote:
>>>>>>>
>>>>>>>> Hi Alex,
>>>>>>>>
>>>>>>>> By default, the client assumes new objects use JSON as the
>>>>>>>> encoding. The protocol buffers are only used on the wire to encode Riak's
>>>>>>>> protocol. If you want to use your own protobuffs messages, I suggest two
>>>>>>>> things:
>>>>>>>>
>>>>>>>> 1. Decide on a `content_type` property for each of your data types
>>>>>>>> and be sure to assign that to each key as you create it. I've used
>>>>>>>> 'application/pb-person' as an example below.
>>>>>>>> 2. Register encoder and decoder functions [1] on the RiakClient
>>>>>>>> object, like so:
>>>>>>>>
>>>>>>>> client.set_decoder('application/pb-person', Person.ParseFromString)
>>>>>>>> client.set_encoder('application/pb-person', lambda x:
>>>>>>>> x.SerializeToString())
>>>>>>>>
>>>>>>>> [1]
>>>>>>>> http://riak-python-client.readthedocs.org/en/latest/client.html#serialization
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>>
>>>>>>>>  On Mon, Jun 23, 2014 at 9:19 AM, Alex De la rosa <
>>>>>>>> alex.rosa.box at gmail.com> wrote:
>>>>>>>>
>>>>>>>>>  Hi there,
>>>>>>>>>
>>>>>>>>> I just installed RIAK 2.0 beta 1 and was playing with the Python
>>>>>>>>> library using 'pbc' (Protocol Buffers).
>>>>>>>>>
>>>>>>>>> test.py
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>  import riak
>>>>>>>>>  client = riak.RiakClient(host ='127.0.0.1', http_port = 8098,
>>>>>>>>> pb_port = 8087, protocol = 'pbc')
>>>>>>>>>  bucket = client.bucket('people')
>>>>>>>>>
>>>>>>>>> key = bucket.new('alex', data={"username":"Alex","age":33})
>>>>>>>>> key.store()
>>>>>>>>>
>>>>>>>>> print bucket.get('alex').encoded_data
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>
>>>>>>>>> it works perfectly and it prints {"username": "Alex", "age": 33}
>>>>>>>>> as it should print.
>>>>>>>>>
>>>>>>>>> However, I'm not using a proto file (person.proto) and compiling
>>>>>>>>> it into binary for Python to use it... something like:
>>>>>>>>>
>>>>>>>>> person.proto
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>  message Person {
>>>>>>>>>   required string username = 1;
>>>>>>>>>   required int32 age = 2;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>
>>>>>>>>> xxx.py
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>  import person_pb2
>>>>>>>>> person = person_pb2.Person()
>>>>>>>>> person.username = "Alex"
>>>>>>>>> person.age = 33
>>>>>>>>> data = person.SerializeToString()
>>>>>>>>>
>>>>>>>>> --------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------+--------
>>>>>>>>>
>>>>>>>>> Am I using the 'pbc' interface wrong? however, on Riak's examples
>>>>>>>>> page is done also without the "proto" file... I'm a bit confused at the
>>>>>>>>> moment as it changed the way I normally would use Protocol Buffers.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Alex
>>>>>>>>>
>>>>>>>>>  _______________________________________________
>>>>>>>>> riak-users mailing list
>>>>>>>>> riak-users at lists.basho.com
>>>>>>>>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Sean Cribbs <sean at basho.com>
>>>>>>>> Software Engineer
>>>>>>>> Basho Technologies, Inc.
>>>>>>>> http://basho.com/
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> riak-users mailing list
>>>>>>> riak-users at lists.basho.com
>>>>>>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
>>>>>>>
>>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> riak-users mailing list
>>>>> riak-users at lists.basho.com
>>>>> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
>>>>>
>>>>>
>>>>
>>>
>>
>
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>


-- 
Sean Cribbs <sean at basho.com>
Software Engineer
Basho Technologies, Inc.
http://basho.com/
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