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From J T <jt4websi...@googlemail.com>
Subject Re: Using Cassandra via the Erlang Thrift Client API (HOW ??)
Date Thu, 04 Mar 2010 17:27:52 GMT
Hi All,

Many thanks for the responses. You helped enormously. I was in fact talking
to the wrong port. It should have been 9160 rather than 8888.
I just assumed that the port the cassandra server displayed when starting up
was the one I should be talking to, my bad. I should have read the config
file.

Once I have something working I'll write a new post back with a couple of
examples here to help future newbies on how to talk to cassandra from
erlang, since those examples are not present on the cassandra/thrift wiki as
far as I can tell.

Thanks,

Jason

On Thu, Mar 4, 2010 at 1:34 PM, <Jeremey.Barrett@nokia.com> wrote:

> I think you want port 9160, not 8888... dt_socket != thrift.
>
> Jeremey.
>
> On Mar 4, 2010, at 2:02 AM, ext J T wrote:
>
> > Hi,
> >
> > I've been trying to piece together some notion of how to use cassandra
> from an erlang client.
> >
> > So far I have managed to come up with the following, but it doesn't work.
> >
> > Unfortunately there does not seem to be any decent documentation on the
> subject I can find with googling so I'm hoping some more experienced members
> of this mailing list can point out what I'm doing wrong.
> >
> > I'm using cassandra 0.5, and I think the latest version of thrift.
> >
> > I generated the thrift erlang client code using:
> >
> > $ thrift -r --gen erl cassandra.thrift
> >
> > And compiled and copied that into my ebin area, along with the rest of
> the thrift erlc library code.
> >
> > I start cassandra using its default config bin/cassandra -f and there are
> no apparent errors:
> >
> > $ bin/cassandra -f
> > Listening for transport dt_socket at address: 8888
> > INFO - Sampling index for
> /var/lib/cassandra/data/system/LocationInfo-9-Data.db
> > INFO - Replaying /var/lib/cassandra/commitlog/CommitLog-1267655779083.log
> > INFO - Log replay complete
> > INFO - Saved Token found: 141354730401634313333347303685581151939
> > INFO - Starting up server gossip
> > INFO - Cassandra starting up...
> >
> > then after a few seconds, it displays this:
> >
> > Debugger failed to attach: timeout during handshake
> >
> > Then from an erl vm I try the following:
> >
> > rr(cassandra_types).
> > {ok, C} = thrift_client:start_link("localhost",8888, cassandra_thrift).
> > thrift_client:call( C,
> >                   'insert',
> >                   [ "Keyspace1",
> >                     "1",
> >                     #columnPath{column_family="Standard1",
> column="email"},
> >                     "ted@example.com<mailto:ted@example.com>",
> >                     1,
> >                     1
> >                     ] ).
> >
> > Unfortunately, although I get a cassandra_thrift client connection, the
> call to insert fails with :
> >
> > =ERROR REPORT==== 4-Mar-2010::07:57:50 ===
> > ** Generic server <0.333.0> terminating
> > ** Last message in was {call,insert,
> >                             ["Keyspace1","1",
> >                              {columnPath,"Standard1",undefined,"email"},
> >                              "ted@example.com<mailto:ted@example.com
> >",1,1]}
> > ** When Server state == {state,cassandra_thrift,
> >                         {protocol,thrift_binary_protocol,
> >                          {binary_protocol,
> >
> {transport,thrift_buffered_transport,<0.334.0>},
> >                           true,true}},
> >                         0}
> > ** Reason for termination ==
> > ** {{case_clause,{error,closed}},
> >    [{thrift_client,read_result,3},
> >     {thrift_client,catch_function_exceptions,2},
> >     {thrift_client,handle_call,3},
> >     {gen_server,handle_msg,5},
> >     {proc_lib,init_p_do_apply,3}]}
> > ** exception exit: {case_clause,{error,closed}}
> >     in function  thrift_client:read_result/3
> >     in call from thrift_client:catch_function_exceptions/2
> >     in call from thrift_client:handle_call/3
> >     in call from gen_server:handle_msg/5
> >     in call from proc_lib:init_p_do_apply/3
> >
> > Cassandra itself reports nothing.
> >
> > -- JT.
>
>

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