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From Walter Gillett <walter_gill...@yahoo.com>
Subject problem running lazyboy example: save() is not working?
Date Mon, 19 Oct 2009 11:48:58 GMT
I'm running the latest lazyboy against apache-cassandra-incubating-0.4.0, with python 2.6.2
on ubuntu 9.04. I have modified the cassandra file storage-conf.xml to add the Keyspace that
lazyboy wants:

    <Keyspace Name="UserData">
      <ColumnFamily CompareWith="BytesType" Name="Users"/>
    </Keyspace>

and have cleaned out all the data under the /var/lib/cassandra directories to ensure that
cassandra gets a clean start. On running the lazyboy example like so: "python record.py"
I get the output shown below, with an error about "Bad key passed to load()". (I've modified
the example slightly to make the print statements more informative but the executable code
is unchanged.)

On reading the code, looks like things go off the tracks earlier than that. The example code
first prints u.is_modified(), which is True because u contains an unsaved User object. Then
comes u.save() to save the User to cassandra. Then print u.is_modified()again to show that
now the value is False. Except that the value I get is actually True! Thinking that explains
the downstream error in trying to load the object, it didn't get saved properly so it can't
be loaded.

Any ideas what's going on? I tried the obvious trick of putting in sleep(5) in case there
is a race condition but that didn't work. Is lazyboy compatible with this version of cassandra?
The lazyboy example comes with Cassandra-0.4.0-py2.6.egg suggesting that the version is compatible,
but clearly something is wrong. I have also included the cassandra console output below in
case that's useful.

Walter Gillett

Running the example (with modified print statements):

$ python record.py
u.key:
{'column_family': 'Users', 'keyspace': 'UserData', 'super_column': None, 'key': 'd86e9901ba6845ba84d3d93b7ff4a7b8'}

User(data):
User: {'username': 'ieure', 'email': 'ian@digg.com'}

u.is_modified()
True

u.is_modified()
True

Traceback (most recent call last):
  File "record.py", line 80, in <module>
    u_ = User().load(key)
  File "/usr/lib/python2.6/site-packages/lazyboy/record.py", line 128, in load
    assert isinstance(key, Key), "Bad key passed to load()"
AssertionError: Bad key passed to load()

Cassandra console output:

$ $CASSANDRA/bin/cassandra -f
Listening for transport dt_socket at address: 8888
DEBUG - Loading settings from /opt/cassandra/bin/../conf/storage-conf.xml
DEBUG - Syncing log with a period of 1000
DEBUG - opening keyspace Keyspace1
DEBUG - adding Super1 as 0
DEBUG - adding Standard2 as 1
DEBUG - adding Standard1 as 2
DEBUG - adding StandardByUUID1 as 3
DEBUG - adding LocationInfo as 4
DEBUG - adding HintsColumnFamily as 5
DEBUG - adding Users as 6
DEBUG - opening keyspace system
DEBUG - opening keyspace UserData
INFO - Saved Token not found. Using 90758413375805622705049558609953482402
DEBUG - Starting to listen on 127.0.0.1:7001
DEBUG - Binding thrift service to localhost:9160
INFO - Cassandra starting up...
DEBUG - batch_insert
DEBUG - insertBlocking writing key f9df5e4875b54281ab57d36efed723b0 to 12@[127.0.0.1:7000]
DEBUG - Applying RowMutation(table='UserData', key='f9df5e4875b54281ab57d36efed723b0', modifications=[ColumnFamily(Users
[[101, 109, 97, 105, 108],[117, 115, 101, 114, 110, 97, 109, 101],])])
DEBUG - RowMutation(table='UserData', key='f9df5e4875b54281ab57d36efed723b0', modifications=[ColumnFamily(Users
[[101, 109, 97, 105, 108],[117, 115, 101, 114, 110, 97, 109, 101],])]) applied.  Sending
response to 12@127.0.0.1:7000
DEBUG - Processing response on a callback from 12@127.0.0.1:7000


      
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