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Type:
Bug
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Resolution: Done
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Priority:
Blocker - P1
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Affects Version/s: 2.1.0
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Component/s: Public API
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None
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Environment:Mac OS X 10.10.4 running Ruby driver 2.1.0-beta against MongoDB 2.6.5
Original issue was filed at https://github.com/mongoid/mongoid/issues/4097, it looks like https://github.com/mongodb/mongo-ruby-driver/commit/90525b13c65d512ea9528509243116c4dde78e1e was put in place for what I had filed but the issue still occurs. Here's a simple Mongoid spec you can paste in to illustrate the problem:
Mongo::Logger.logger = Logger.new(STDOUT) default = Mongoid.client(:default) puts default.options Band.with(:write => {:w => 0}).collection.find({:_id => BSON::ObjectId.new}).update_one(:$set => {:foo => "bar"}) default2 = Mongoid.client(:default) puts default2.options Band.collection.find({:_id => BSON::ObjectId.new}).update_one(:$set => {:baz => "qux"})
produces logs:
{:database=>"mongoid_test", :server_selection_timeout=>0.5, :max_pool_size=>1, :heartbeat_frequency=>180, :user=>"mongoid-user", :password=>"password", :auth_source=>"admin"}
D, [2015-07-13T15:07:58.510872 #8189] DEBUG -- : MONGODB | 127.0.0.1:27017 | mongoid_test.update | STARTED | {:update=>"bands", :updates=>[{:q=>{:_id=><BSON::ObjectId:0x70103815604660 data=55a40c8e6a6f6e1ffd000000>}, :u=>{:$set=>{:foo=>"bar"}}, :multi=>false, :upsert=>false}], :writeConcern=>{:w=>0}, :ordered=>true}
D, [2015-07-13T15:07:58.511738 #8189] DEBUG -- : MONGODB | 127.0.0.1:27017 | mongoid_test.update | SUCCEEDED | 0.000916s
{:database=>:mongoid_test, :server_selection_timeout=>0.5, :max_pool_size=>1, :heartbeat_frequency=>180, :user=>"mongoid-user", :password=>"password", :auth_source=>"admin", :write=>{:w=>0}}
D, [2015-07-13T15:07:58.511954 #8189] DEBUG -- : MONGODB | 127.0.0.1:27017 | mongoid_test.update | STARTED | {:update=>"bands", :updates=>[{:q=>{:_id=><BSON::ObjectId:0x70103848795240 data=55a40c8e6a6f6e1ffd000001>}, :u=>{:$set=>{:baz=>"qux"}}, :multi=>false, :upsert=>false}], :writeConcern=>{:w=>0}, :ordered=>true}
D, [2015-07-13T15:07:58.512351 #8189] DEBUG -- : MONGODB | 127.0.0.1:27017 | mongoid_test.update | SUCCEEDED | 0.000413s
You can see from the logs that the writeConcern of w:0 remains on the second query, and that repulling the client has its write concern affected and set to w:0.