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Concurrent insert into nonexistent database often fails with "database not found" on 4.1.7

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 4.1.7
    • Fix Version/s: None
    • Component/s: Sharding
    • Labels:
      None

      Description

      Found by a python test in PYTHON-1725.

      Concurrently inserting into a collection when the database does not exist often fails on mongos 4.1.7 with "unable to initialize targeter for write op for collection auth_test_46.test :: caused by :: Database auth_test_46 not found :: caused by :: database auth_test_46 not found"

      Here's a simple python repro: repro-1725.py. First start a sharded cluster (with or without auth) and then run the script:

      $ python3.7 repro-1725.py
      Exception in thread Thread-551:
      Traceback (most recent call last):
        File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
          self.run()
        File "repro-1725.py", line 33, in run
          self.coll.insert_one({'num': i})
        File "/Users/shane/git/mongo-python-driver/pymongo/collection.py", line 694, in insert_one
          session=session),
        File "/Users/shane/git/mongo-python-driver/pymongo/collection.py", line 608, in _insert
          bypass_doc_val, session)
        File "/Users/shane/git/mongo-python-driver/pymongo/collection.py", line 596, in _insert_one
          acknowledged, _insert_command, session)
        File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 1329, in _retryable_write
          return self._retry_with_session(retryable, func, s, None)
        File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 1282, in _retry_with_session
          return func(session, sock_info, retryable)
        File "/Users/shane/git/mongo-python-driver/pymongo/collection.py", line 591, in _insert_command
          retryable_write=retryable_write)
        File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", line 579, in command
          unacknowledged=unacknowledged)
        File "/Users/shane/git/mongo-python-driver/pymongo/network.py", line 150, in command
          parse_write_concern_error=parse_write_concern_error)
        File "/Users/shane/git/mongo-python-driver/pymongo/helpers.py", line 155, in _check_command_response
          raise OperationFailure(msg % errmsg, code, response)
      pymongo.errors.OperationFailure: unable to initialize targeter for write op for collection db_11.test :: caused by :: Database db_11 not found :: caused by :: database db_11 not found
       
      Traceback (most recent call last):
        File "repro-1725.py", line 62, in <module>
          repro()
        File "repro-1725.py", line 56, in repro
          assert t.success
      AssertionError
      

      The failing command and response is:

      23 Jan 19 16:23 -0800 (Connection: 104:657430200)  op_msg insert db_2 Request:{"sections":[{"payload":{"$clusterTime":{"clusterTime":{"$timestamp":{"t":1548289382,"i":191}},"signature":{"hash":{"$binary":"AI87y83wEE6V+ELmJaUtbleLSHY=","$type":"00"},"keyId":{"$numberLong":"6649842944649986060"}}},"$db":"db_2","$readPreference":{"mode":"primary"},"insert":"test","lsid":{"id":{"$binary":"srMbo3+9SlS8J+jwS2CMlg==","$type":"04"}},"ordered":true},"payloadType":0},{"payload":{"documents":[{"_id":{"$oid":"5c49056618a944e27153a1f5"},"num":0}],"identifier":"documents","size":45},"payloadType":1}]}
       
      23 Jan 19 16:23 -0800 (Connection: 104:657430200) +118.636ms op_msg reply   Response:{"sections":[{"payload":{"$clusterTime":{"clusterTime":{"$timestamp":{"t":1548289382,"i":196}},"signature":{"hash":{"$binary":"AI87y83wEE6V+ELmJaUtbleLSHY=","$type":"00"},"keyId":{"$numberLong":"6649842944649986060"}}},"code":26,"codeName":"NamespaceNotFound","errmsg":"unable to initialize targeter for write op for collection db_2.test :: caused by :: Database db_2 not found :: caused by :: database db_2 not found","ok":0.0,"operationTime":{"$timestamp":{"t":1548289382,"i":194}}},"payloadType":0}]}
      

      Edit: This is reproducible with and without auth enabled.

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