[AVRO-1177] IPC interoperability problems with handshake

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.2
• Fix Version/s: 1.7.3
• Component/s: ruby
• Labels: patch
• Assignee: Georg Franz
• Reporter: Georg Franz
• Created: 01/Oct/12 08:50
• Updated: 10/Dec/12 17:57
• Resolved: 28/Nov/12 22:47

Description

I tried to get a simple echo service working using Java (client) to Ruby (server).

The service should be called repeatedly in a loop. I tried several things, but the best result I got was that it would work once, then raising this exception on the ruby side:

lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:46:in `byte!': undefined method `unpack' for nil:NilClass (NoMethodError)
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:63:in `read_long'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:380:in `read_union'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:316:in `read_data'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:391:in `block in read_record'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:389:in `each'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:389:in `read_record'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:317:in `read_data'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/io.rb:282:in `read'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/ipc.rb:309:in `process_handshake'
from lib/ruby/gems/1.9.1/gems/avro-1.7.2/lib/avro/ipc.rb:253:in `respond'

On investigation, I found out that the ruby Responder expects a handshake on every request whereas the Java Requestor just sends a handshake the first time around.

I quickly hacked up Ruby support for multiple calls on the same connection similar to what the Java code does.