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From Pete Warden <p...@petewarden.com>
Subject TransportException when storing large values
Date Tue, 20 Sep 2011 21:26:18 GMT
I'm running into consistent problems when storing values larger than 15MB
into Cassandra, and I was hoping for some advice on tracking down what's
going wrong. From the FAQ it seems like what I'm trying to do is possible,
so I assume I'm messing something up with my configuration. I have a minimal
set of code to reproduce the issue below, which I've run on the DataStax
0.8.1 AMI I'm using in production (ami-9996c4dc)

# To set up the test data structure on Cassandra:

cassandra-cli
connect localhost/9160;
create keyspace TestKeyspace with
  placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy' and
  strategy_options = [{replication_factor:3}];
use TestKeyspace;
create column family TestFamily with
  comparator = UTF8Type and
  column_metadata =
  [
    {column_name: test_column, validation_class: UTF8Type},
  ];

# From bash on the same machine, with Ruby and the Cassandra gem installed:

irb
require 'rubygems'
require 'cassandra/0.8'

client = Cassandra.new('TestKeyspace', 'localhost:9160', :retries => 5,
:connect_timeout => 5, :timeout => 10)

# With data this size, the call works
column_value = 'a' * (14*1024*1024)
row_value = { 'column_name' => column_value }
client.insert(:TestFamily, 'SomeKey', row_value)


# With data this size, the call fails with the exception below
column_value = 'a' * (15*1024*1024)
row_value = { 'column_name' => column_value }
client.insert(:TestFamily, 'SomeKey', row_value)

# Results:

This first call with a 14MB chunk of data succeeds, but the second one fails
with this exception:

CassandraThrift::Cassandra::Client::TransportException:
CassandraThrift::Cassandra::Client::TransportException
from
/usr/lib/ruby/gems/1.8/gems/thrift-0.7.0/lib/thrift/transport/socket.rb:53:in
`open'
from
/usr/lib/ruby/gems/1.8/gems/thrift-0.7.0/lib/thrift/transport/framed_transport.rb:37:in
`open'
from
/usr/lib/ruby/gems/1.8/gems/thrift_client-0.7.1/lib/thrift_client/connection/socket.rb:11:in
`connect!'
from
/usr/lib/ruby/gems/1.8/gems/thrift_client-0.7.1/lib/thrift_client/abstract_thrift_client.rb:105:in
`connect!'
from
/usr/lib/ruby/gems/1.8/gems/thrift_client-0.7.1/lib/thrift_client/abstract_thrift_client.rb:144:in
`handled_proxy'
from
/usr/lib/ruby/gems/1.8/gems/thrift_client-0.7.1/lib/thrift_client/abstract_thrift_client.rb:60:in
`batch_mutate'
from
/usr/lib/ruby/gems/1.8/gems/cassandra-0.12.1/lib/cassandra/protocol.rb:7:in
`_mutate'
from
/usr/lib/ruby/gems/1.8/gems/cassandra-0.12.1/lib/cassandra/cassandra.rb:459:in
`insert'
from (irb):6
from :0

Any suggestions on how to dig deeper? I'll be reaching out to the Cassandra
gem folks, etc too of course.

cheers,
           Pete

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