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From: "Dr. Andrew Perella" <ajp@eutechnyx.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Subject: RE: Cassandra - python communication problem
Thread-Topic: Cassandra - python communication problem
Thread-Index: AcuANjlp8CPKx6NITFeCQsAFjL6CJgAARP4AAABiSJA=
Date: Tue, 9 Nov 2010 18:07:49 +0000
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Thanks Jonathan,=20
So it looks like the python bindings are using a deprecated non framed prot=
ocol. Leaving that problem aside for a moment I changed the server to work =
in non framed mode and now get a different error:


vu@vs001:~/apache-cassandra-0.7.0-beta3/interface/gen-py/cassandra$ Cassand=
ra-remote  -h localhost:9160 describe_keyspace systemTraceback (most recent=
 call last):
  File "/usr/local/bin/Cassandra-remote", line 5, in <module>
    pkg_resources.run_script('python-cassandra=3D=3D0.6.1', 'Cassandra-remo=
te')
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 461, in ru=
n_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 1194, in r=
un_script
    execfile(script_filename, namespace, namespace)
  File "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6=
.egg/EGG-INFO/scripts/Cassandra-remote", line 204, in <module>
    pp.pprint(client.describe_keyspace(args[0],))
  File "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6=
.egg/cassandra/Cassandra.py", line 1006, in describe_keyspace
    return self.recv_describe_keyspace()
  File "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6=
.egg/cassandra/Cassandra.py", line 1030, in recv_describe_keyspace
    raise TApplicationException(TApplicationException.MISSING_RESULT, "desc=
ribe_keyspace failed: unknown result");
thrift.Thrift.TApplicationException: describe_keyspace failed: unknown resu=
lt

Any ideas?
Cheers,
Andrew

-----Original Message-----
From: Jonathan Ellis [mailto:jbellis@gmail.com]=20
Sent: 09 November 2010 17:56
To: user
Subject: Re: Cassandra - python communication problem

You're using an unframed transport to talk to a framed server, or vice vers=
a.

On Tue, Nov 9, 2010 at 11:47 AM, Dr. Andrew Perella <ajp@eutechnyx.com> wro=
te:
> Hi,
>
>
>
> I have been trying to connect to Cassandra 0.7.0-beta3 via python to no
> avail:
>
>
>
> vu@vs001:~/apache-cassandra-0.7.0-beta3/interface/gen-py/cassandra$
> Cassandra-remote=A0 -h localhost:9160 describe_keyspace system
>
> Traceback (most recent call last):
>
> =A0 File "/usr/local/bin/Cassandra-remote", line 5, in <module>
>
> =A0=A0=A0 pkg_resources.run_script('python-cassandra=3D=3D0.6.1', 'Cassan=
dra-remote')
>
> =A0 File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 461, i=
n
> run_script
>
> =A0=A0=A0 self.require(requires)[0].run_script(script_name, ns)
>
> =A0 File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 1194, =
in
> run_script
>
> =A0=A0=A0 execfile(script_filename, namespace, namespace)
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6.egg/=
EGG-INFO/scripts/Cassandra-remote",
> line 204, in <module>
>
> =A0=A0=A0 pp.pprint(client.describe_keyspace(args[0],))
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6.egg/=
cassandra/Cassandra.py",
> line 1006, in describe_keyspace
>
> =A0=A0=A0 return self.recv_describe_keyspace()
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/python_cassandra-0.6.1-py2.6.egg/=
cassandra/Cassandra.py",
> line 1017, in recv_describe_keyspace
>
> =A0=A0=A0 (fname, mtype, rseqid) =3D self._iprot.readMessageBegin()
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/Thrift-0.2.0-py2.6-linux-x86_64.e=
gg/thrift/protocol/TBinaryProtocol.py",
> line 126, in readMessageBegin
>
> =A0=A0=A0 sz =3D self.readI32()
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/Thrift-0.2.0-py2.6-linux-x86_64.e=
gg/thrift/protocol/TBinaryProtocol.py",
> line 203, in readI32
>
> =A0=A0=A0 buff =3D self.trans.readAll(4)
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/Thrift-0.2.0-py2.6-linux-x86_64.e=
gg/thrift/transport/TTransport.py",
> line 58, in readAll
>
> =A0=A0=A0 chunk =3D self.read(sz-have)
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/Thrift-0.2.0-py2.6-linux-x86_64.e=
gg/thrift/transport/TTransport.py",
> line 155, in read
>
> =A0=A0=A0 self.__rbuf =3D StringIO(self.__trans.read(max(sz, self.DEFAULT=
_BUFFER)))
>
> =A0 File
> "/usr/local/lib/python2.6/dist-packages/Thrift-0.2.0-py2.6-linux-x86_64.e=
gg/thrift/transport/TSocket.py",
> line 94, in read
>
> =A0=A0=A0 raise TTransportException(type=3DTTransportException.END_OF_FIL=
E,
> message=3D'TSocket read 0 bytes')
>
> thrift.transport.TTransport.TTransportException: TSocket read 0 bytes
>
>
>
> I get similar errors for all queries.
>
>
>
> I cannot work out what is going wrong here. Can anyone help? (I need many=
 of
> the functions only added in 0.7)
>
>
>
> Best Regards,
>
> Andrew
>
>
>
>
>
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w.
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--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
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