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  1. Core Server
  2. SERVER-37458

Mongos does not apply commitTransaction's writeConcern

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      from pymongo import MongoClient, WriteConcern
      		 
      client = MongoClient()
      		 
      client.t.t.insert_one({}) # Create collection
      		 
      with client.start_session() as s, s.start_transaction(write_concern=WriteConcern(w="foo")):
      		 
          client.t.t.insert_one({}, session=s)

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      from pymongo import MongoClient, WriteConcern client = MongoClient() client.t.t.insert_one({}) # Create collection with client.start_session() as s, s.start_transaction(write_concern = WriteConcern(w = "foo" )): client.t.t.insert_one({}, session = s)
    • Sharding 2018-12-17

    Description

      Mongos seems to ignore the user's writeConcern on commitTransaction. For example:

      01 Oct 18 15:00 -0700 (Connection: 1:890886553)  op_msg commitTransaction admin Request:{"sections":[{"payload":{"$clusterTime":{"clusterTime":{"$timestamp":{"t":1538431201,"i":1}},"signature":{"hash":{"$binary":"AAAAAAAAAAAAAAAAAAAAAAAAAAA=","$type":"00"},"keyId":{"$numberLong":"0"}}},"$db":"admin","$readPreference":{"mode":"primary"},"autocommit":false,"commitTransaction":1,"lsid":{"id":{"$binary":"aK08elgGS0yy+LqHWjEHQQ==","$type":"04"}},"txnNumber":{"$numberLong":"4"},"writeConcern":{"w":"foo"}},"payloadType":0}]}
      		 
       
      		 
       
      		 
      01 Oct 18 15:00 -0700 (Connection: 1:890886553) +955µs op_msg reply   Response:{"sections":[{"payload":{"$clusterTime":{"clusterTime":{"$timestamp":{"t":1538431201,"i":2}},"signature":{"hash":{"$binary":"AAAAAAAAAAAAAAAAAAAAAAAAAAA=","$type":"00"},"keyId":{"$numberLong":"0"}}},"ok":1.0,"operationTime":{"$timestamp":{"t":1538431201,"i":2}}},"payloadType":0}]}

      Notice writeConcern:{w:"foo"} which should cause an unknown write concern error.

      Tested on https://github.com/mongodb/mongo/commit/860b392d9d3c006090a4c7fc3c6f3fa5460e5c5c:

      mongodb-macos-x86_64-4.1.3-233-g860b392/bin/mongos --version
      		 
      mongos version v4.1.3-233-g860b392
      		 
      git version: 860b392d9d3c006090a4c7fc3c6f3fa5460e5c5c
      		 
      allocator: system
      		 
      modules: none
      		 
      build environment:
      		 
          distarch: x86_64
      		 
          target_arch: x86_64

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          is duplicated by

          Task - A task that needs to be done. SERVER-37925 Transaction coordinator shard should respect client's writeConcern before communicating decision to client

          • Major - P3 - Major loss of function.
          • Closed

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              esha.maharishi@mongodb.com Esha Maharishi (Inactive)
              shane.harvey@mongodb.com Shane Harvey
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                Updated:
                Resolved: