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  1. Python Driver
  2. PYTHON-2136

Provide diagnostic information in ServerSelectionTimeoutError exception message

    • Type: Icon: Improvement Improvement
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 3.11
    • Affects Version/s: None
    • Component/s: None
    • Labels:

      In https://github.com/rueckstiess/mtools/issues/691#issuecomment-590933618 I am getting a ServerSelectionTimeoutError from the Python driver, as used by mlaunch. The error produced is:

      [2020/02/24 18:21:34.359] pymongo.errors.ServerSelectionTimeoutError: No replica set members match selector "Primary()"

      This error provides just about no assistance in determining and resolving the problem.

      The Ruby driver produces the following message when server selection fails:

      Mongo::Error::NoServerAvailable (No primary server is available in cluster: #<Cluster topology=ReplicaSetNoPrimary[ip-10-1-1-165:27017,ip-10-1-1-11.ap-northeast-1.compute.internal:27017,ip-10-1-1-135.ap-northeast-1.compute.internal:27017,name=mongoTest,v=29,e=7fffffff0000000000000013] servers=#<Server address=ip-10-1-1-165:27017 SECONDARY replica_set=mongoTest>,#<Server address=ip-10-1-1-11.ap-northeast-1.compute.internal:27017 UNKNOWN>,#<Server address=ip-10-1-1-135.ap-northeast-1.compute.internal:27017 SECONDARY replica_set=mongoTest>> with timeout=30, LT=0.015. The following servers have dead monitor threads: #<Server address=ip-10-1-1-165:27017 SECONDARY replica_set=mongoTest>, #<Server address=ip-10-1-1-11.ap-northeast-1.compute.internal:27017 UNKNOWN>, #<Server address=ip-10-1-1-135.ap-northeast-1.compute.internal:27017 SECONDARY replica_set=mongoTest>)

      This message provides the following information:

      1. Addresses of all the servers in the cluster.
      2. The state of each server.
      3. Server selection timeout used.

      As a result, it is much easier for the user to identify the reason for the failure and subsequently address it.

      Please consider adding similar diagnostics to the Python driver.

            julius.park@mongodb.com Julius Park (Inactive)
            oleg.pudeyev@mongodb.com Oleg Pudeyev (Inactive)
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