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Type:
Bug
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Resolution: Done
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Priority:
Critical - P2
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Affects Version/s: 1.8.5
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Component/s: Replica Set
If you attempt to create a Mongo::MongoReplicaSetClient with the :read option of :nearest, it fails with this error every time.
ERROR: <NameError> undefined local variable or method `pools' for #<Mongo::MongoReplicaSetClient:0x6b18617f>
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/util/read_preference.rb:80:in `select_pool'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/util/read_preference.rb:53:in `read_pool'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/mongo_replica_set_client.rb:342:in `checkout_reader'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/mongo_replica_set_client.rb:326:in `checkout'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/mongo_replica_set_client.rb:341:in `checkout_reader'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:540:in `checkout_socket_from_connection'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:469:in `send_initial_query'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/util/logging.rb:33:in `instrument'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/util/logging.rb:65:in `instrument'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/util/logging.rb:32:in `instrument'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:466:in `send_initial_query'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:451:in `refresh'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:110:in `next'
/jruby/1.9/gems/mongo-1.8.4/lib/mongo/cursor.rb:271:in `each'
If you look at the code, you can clearly see it hasn't been implemented properly (I'm guessing no unit test?). The variable 'pool' is wrong, and it calls the wrong method, it should be calling 'select_near_pool' and using 'secondary_pools'
https://github.com/mongodb/mongo-ruby-driver/blob/master/lib/mongo/util/read_preference.rb#L80