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From Bruno Couto <bco...@gmail.com>
Subject Re: Newbe´s question
Date Mon, 24 Aug 2009 18:54:35 GMT
Thanks for helpping me Jonathan!

Well, now I know that I can´t use the Lazyboy, then I will try my
first steps using the Cassandra trunk version and thrift api whitout a
wrapper.


On Mon, Aug 24, 2009 at 2:41 PM, Jonathan Ellis<jbellis@gmail.com> wrote:
> lazyboy works vs an earlier version of trunk, so it's already
> incompatible with 0.3, but not yet compatible w/ latest 0.4 :)
>
> On Mon, Aug 24, 2009 at 12:28 PM, Bruno Couto<bcouto@gmail.com> wrote:
>> Jonathan,
>>
>>
>> First, thanks for answering so fast.
>> I´m using version 0.3-final of Cassandra, then I believe the api
>> version 0.4 is not the problem, am I correct?
>> I'll look for the null problem.
>>
>>
>> Bruno Couto
>>
>>
>> On Mon, Aug 24, 2009 at 11:50 AM, Jonathan Ellis<jbellis@gmail.com> wrote:
>>> There's two things going on here, I think.
>>>
>>> One is that you're passing a null where there shouldn't be one.  This
>>> is a thrift bug and will be addressed in the next beta.
>>>
>>> The other is that IIRC lazyboy needs to be updated to work with the
>>> latest 0.4 api.
>>>
>>> -Jonathan
>>>
>>> On Mon, Aug 24, 2009 at 9:09 AM, Bruno Couto<bcouto@gmail.com> wrote:
>>>> Hi Guys,
>>>>
>>>> my name is Bruno and I'm from Brazil, first, sorry for my bad english.
>>>> I'm in my first steps with cassandra, and I´m trying to use Lazyboy
>>>> (python wrapper).
>>>> But when I run the layzyboy columnfamily.py example, I get the
>>>> following error messages.
>>>> Someone with more experience could help me?
>>>>
>>>> Thanks,
>>>>
>>>> Bruno Couto.
>>>>
>>>>
>>>> ----
>>>>
>>>> Cassandra Error Message:
>>>>
>>>> DEBUG - batch_insert
>>>> ERROR - Internal error processing batch_insert
>>>> java.lang.NullPointerException
>>>>        at org.apache.cassandra.db.RowMutation.getRowMutation(RowMutation.java:284)
>>>>        at org.apache.cassandra.service.CassandraServer.batch_insert(CassandraServer.java:318)
>>>>        at org.apache.cassandra.service.Cassandra$Processor$batch_insert.process(Cassandra.java:968)
>>>>        at org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:807)
>>>>        at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:252)
>>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>>        at java.lang.Thread.run(Thread.java:619)
>>>> DEBUG - Disseminating load info ...
>>>>
>>>> ----
>>>>
>>>> Python Error Message:
>>>>
>>>> localhost ~ # python columnfamily.py
>>>> {'table': 'UserData', 'superkey': None, 'key':
>>>> '3a63b82a947d4ee1a8cbee45944b5dcb', 'family': 'Users', 'supercol':
>>>> None}
>>>> {'username': 'ieure', 'email': 'ian@digg.com'}
>>>> True
>>>> Traceback (most recent call last):
>>>>  File "columnfamily.py", line 65, in <module>
>>>>    u.save()           # -> {'username': 'ieure', 'email': 'ian@digg.com'}
>>>>  File "/root/columnfamily.py", line 119, in save
>>>>
>>>>  File "build/bdist.linux-i686/egg/lazyboy/connection.py", line 106, in func
>>>> lazyboy.exceptions.ErrorThriftMessage: Internal error processing batch_insert
>>>>
>>>> ----
>>>>
>>>> ColumnFamily.py
>>>>
>>>> # -*- coding: utf-8 -*-
>>>> #
>>>> # Lazyboy examples
>>>> #
>>>> # © 2009 Digg, Inc. All rights reserved.
>>>> # Author: Ian Eure <ian@digg.com>
>>>> #
>>>> # This example assumes the following schema:
>>>> #
>>>> # <Tables>
>>>> #     <Table Name="UserData">
>>>> #         <ColumnFamily ColumnSort="Name" Name="Users"/>
>>>> #     </Table>
>>>> # </Tables>
>>>> #
>>>>
>>>>
>>>> from lazyboy import *
>>>>
>>>>
>>>> # Define your cluster(s)
>>>> connection.add_pool('UserData', ['localhost:9160'])
>>>>
>>>>
>>>> # Subclass ColumnFamily to create an object of the correct type.
>>>> class User(columnfamily.ColumnFamily):
>>>>    """A class representing a user in Cassandra."""
>>>>
>>>>    # _key is the key template. It's values are given to
>>>>    # PrimaryKey.__init__ as keyword arguments any time a PK is
>>>>    # instantiated for this object.
>>>>    _key = {'table': 'UserData',        # The table to store in
>>>>            'family': 'Users'}          # The ColumnFamily name
to store on
>>>>
>>>>    # Anything in here _must_ be set before the object is saved
>>>>    _required = ('username',)
>>>>
>>>>
>>>> # Create an empty object
>>>> u = User()
>>>>
>>>> # A PrimaryKey is generated for you:
>>>> print u.pk
>>>> # -> {'table': 'UserData', 'superkey': None,
>>>> #     'key': 'da6c8e19174f40cfa6d0b65a08eef62f',
>>>> #     'family': 'Users', 'supercol': None}
>>>>
>>>> data = {'username': 'ieure', 'email': 'ian@digg.com'}
>>>>
>>>> # The object is a dict. All these are equivalent.
>>>> u.update(data)
>>>> u.update(data.items())
>>>> u.update(**data)
>>>> for k in data:
>>>>    u[k] = data[k]
>>>>
>>>> # Arguments to __init__ are passed to update()
>>>> u = User(data)
>>>> print u            # -> {'username': 'ieure', 'email': 'ian@digg.com'}
>>>>
>>>> # You can see if it's been modified.
>>>> print u.is_modified()           # -> True
>>>>
>>>> # Save to Cassandra
>>>> u.save()           # -> {'username': 'ieure', 'email': 'ian@digg.com'}
>>>>
>>>> print u.is_modified()           # -> False
>>>>
>>>> # Load it in a new instance.
>>>> u_ = User().load(u.pk.key)
>>>> print u_           # -> {'username': 'ieure', 'email': 'ian@digg.com'}
>>>>
>>>> print u.is_modified()           # -> False
>>>> del u['username']
>>>> print u.valid()                 # -> False
>>>> print u.missing()               # -> ('username',)
>>>> try:
>>>>    u.save()        # -> ('Missing required field(s):', ('username',))
>>>> except Exception, e:
>>>>    print e
>>>>
>>>> # Discard modifications
>>>> u.revert()
>>>> print u.is_modified()           # -> False
>>>> print u.valid()                 # -> True
>>>>
>>>
>>
>

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