Listener leaks even when .close() has been called

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
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    • Affects Version/s: 2.2.30
    • Component/s: None
    • Environment:
      Mac OS X El Capitan, Node.js v4.8.0
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      I'm working on a feature which involves gracefully shutting down cluster worker processes in Node.js. Because of that, I'm closing servers, disconnecting from the database, etc.

      Said project uses a database abstraction layer called Databank. Here's where Databank is directly calling the MongoDB driver: https://github.com/e14n/databank-mongodb/blob/bcddbdc38d9f335291575af6462558a3a79b27e6/lib/mongodb.js#L310

      wtfnode reports the following after the app server and database connections have been shut down:

      [WTF Node?] open handles:
- File descriptors: (note: stdio always exists)
  - fd 1 (stdio)
  - fd 2 (stdio)
- Sockets:
  - (?:?) -> localhost:? (destroyed)
    - Listeners:
      - connect: (anonymous) @ /Users/alex/Development/pump.io/node_modules/mongodb-core/lib/connection/connection.js:467
- Others:
  - Pipe

      whereas without shutting down the database it showed this:

      [WTF Node?] open handles:
- File descriptors: (note: stdio always exists)
  - fd 1 (stdio)
  - fd 2 (stdio)
- Sockets:
  - 127.0.0.1:51075 -> 127.0.0.1:27017
    - Listeners:
      - connect: (anonymous) @ /Users/alex/Development/pump.io/node_modules/mongodb-core/lib/connection/connection.js:467
- Timers:
  - (7076617 ~ 1 hr) (anonymous) @ /Users/alex/Development/pump.io/node_modules/connect-databank/lib/connect-databank.js:295
  - (5375501 ~ 1 hr) (anonymous) @ /Users/alex/Development/pump.io/lib/app.js:578
  - (5000 ~ 5 s) (anonymous) @ /Users/alex/Development/pump.io/node_modules/mongodb-core/lib/topologies/server.js:230
- Intervals:
  - (60000 ~ 60 s) (anonymous) @ /Users/alex/Development/pump.io/node_modules/dialback-client/lib/dialbackclient.js:235
  - (60000 ~ 60 s) (anonymous) @ /Users/alex/Development/pump.io/node_modules/dialback-client/lib/dialbackclient.js:235
  - (60000 ~ 60 s) (anonymous) @ /Users/alex/Development/pump.io/node_modules/dialback-client/lib/dialbackclient.js:235
  - (60000 ~ 60 s) (anonymous) @ /Users/alex/Development/pump.io/node_modules/dialback-client/lib/dialbackclient.js:235
- Others:
  - Pipe

      So it's definitely doing something.

      It appears from the stack trace that https://github.com/christkv/mongodb-core/blob/9fe2202ee94f65a30f213d0ad915f1852adcb123/lib/connection/connection.js#L467 is the leaky listener.

      I see this in mongodb-core 2.1.14.

        1. repro.js
          0.4 kB

            Assignee:
            Daniel Aprahamian (Inactive)
            Reporter:
            AJ Jordan
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              Created:
              Updated:
              Resolved: