Uploaded image for project: 'Drivers'
  1. Drivers
  2. DRIVERS-1030

Drivers should check out an implicit session only after checking out a connection

    XMLWordPrintableJSON

Details

    • Spec Change
    • Status: Implementing
    • Major - P3
    • Resolution: Unresolved
    • None
    • Sessions
    • None
    • Needed
    • Hide

      Drivers need to implement a new prose test, and implement either a refactor of their sessions allocation to occur after connection checkout or lazily allocate an existing session after successful checkout.

      Show
      Drivers need to implement a new prose test, and implement either a refactor of their sessions allocation to occur after connection checkout or lazily allocate an existing session after successful checkout.

    Description

      Problem:
      When the number of concurrent application requests are larger than the number of available connections, the driver may generate many more implicit sessions than connections. For example with maxPoolSize=1 and 100 threads, 100 implicit sessions may be created. This increases the load on the server since session state is cached in memory. In the worst case this kind of workload can hit the session limit and trigger TooManyLogicalSessions.

      Proposed solution:
      Drivers should check out an implicit session only after checking out a connection. This change will limit the number of implicit sessions to no greater than an application's maxPoolSize (ignoring operations that hold on to the session like cursors).

      This change would not have any effect on explicit sessions created with startSession.

      Attachments

        Issue Links

          causes

          Improvement - An improvement or enhancement to an existing feature or task. DRIVERS-2398 Limit mongos Hosts for Implicit Session Prose Test

          • Unknown - Priority not determined yet.
          • Implementing
          is duplicated by

          Spec Change - DRIVERS-2126 Drivers should check out an implicit session only after checking out a connection

          • Major - P3 - Major loss of function.
          • Closed
          is related to

          Spec Change - DRIVERS-2218 Clarify intended bounding of implicit session allocation and rework flaky prose test

          • Unknown - Priority not determined yet.
          • Implementing
          related to

          Task - A task that needs to be done. JAVA-3856 Database connection error is not notified or notified after server selection timeout.

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

          Spec Change - DRIVERS-2126 Drivers should check out an implicit session only after checking out a connection

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

          Improvement - An improvement or enhancement to an existing feature or task. JAVA-4365 Check out an implicit session only after checking out a connection

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

          Improvement - An improvement or enhancement to an existing feature or task. RUST-1069 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - CDRIVER-4197 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - CXX-2398 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - CSHARP-3927 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - GODRIVER-2197 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - MOTOR-841 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - NODE-3697 Check out an implicit session only after checking out a connection

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

          Spec Change - PHPLIB-747 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - PYTHON-2956 Drivers should check out an implicit session only after checking out a connection

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

          Spec Change - RUBY-2820 Check out an implicit session only after checking out a connection

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

          Spec Change - SWIFT-1383 Drivers should check out an implicit session only after checking out a connection

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

          Activity

            People

              neal.beeken@mongodb.com Neal Beeken
              esha.bhargava@mongodb.com Esha Bhargava
              Votes:
              0 Vote for this issue
              Watchers:
              7 Start watching this issue

              Dates

                Created:
                Updated: