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  1. Core Server
  2. SERVER-66811

mongos successfully drops indexes with unsatisfiable write concern

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    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Won't Fix
    • None
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    • ALL
    • Sharding NYC 2022-05-30, Sharding NYC 2022-06-13

    Description

      Ruby driver has a test which attemps to drop an index using a write concern having w > # of nodes in the deployment. This test expects a failure from the server which it gets in 3.6 through 5.2 and 6.0 through rc1.

      6.0.0-rc7 and latest server do not produce a failure when in sharded topology. The lack of failure appears to have started with rc2. Standalone and replica sets behave as expected (produce failure) also in 6.0 and latest.

      Repro: https://github.com/p-mongo/tests/tree/master/server-s-index-drop

      Relevant code:

      client = Mongo::Client.new(['localhost'], database: 'test')
       
      client['foo'].indexes.create_one(test: 1)
      client.with(write_concern: {w: 40})['foo'].indexes.drop_one(test: 1)
      

      Result on 6.0 rc2-rc5, rc7 & latest: no error

      Result on pre-6.0 & 6.0 rc1:

      	20: from test.rb:6:in `<main>'
      	19: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/index/view.rb:87:in `drop_one'
      	18: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/index/view.rb:287:in `drop_by_name'
      	17: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/client.rb:1067:in `with_session'
      	16: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/index/view.rb:296:in `block in drop_by_name'
      	15: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/polymorphic_operation.rb:35:in `execute'
      	14: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/server.rb:448:in `with_connection'
      	13: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/server/connection_pool.rb:639:in `with_connection'
      	12: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/polymorphic_operation.rb:37:in `block in execute'
      	11: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/executable.rb:65:in `execute'
      	10: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/executable.rb:65:in `tap'
      	 9: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/executable.rb:66:in `block in execute'
      	 8: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:33:in `validate_result'
      	 7: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:93:in `unpin_maybe'
      	 6: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:34:in `block in validate_result'
      	 5: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:54:in `add_error_labels'
      	 4: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:35:in `block (2 levels) in validate_result'
      	 3: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:107:in `add_server_diagnostics'
      	 2: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/shared/response_handling.rb:36:in `block (3 levels) in validate_result'
      	 1: from /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/result.rb:314:in `validate!'
      /var/lib/gems/2.5.0/gems/mongo-2.17.1/lib/mongo/operation/result.rb:348:in `raise_operation_failure': [100:UnsatisfiableWriteConcern]: Not enough data-bearing nodes; Error details: { writeConcern: { w: 40, wtimeout: 0, provenance: "clientSupplied" } } at shard01 (on localhost) (Mongo::Error::OperationFailure)
      

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              randolph@mongodb.com Randolph Tan
              oleg.pudeyev@mongodb.com Oleg Pudeyev
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