Database is locked (or freezed) when database executes a Datafilesync

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Critical - P2
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    • Affects Version/s: 2.4.5
    • Component/s: Storage
    • Environment:
    • Windows
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      See a DataFileSync on logs and try to make a db.test.find()

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      See a DataFileSync on logs and try to make a db.test.find()
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      When the database is executing a Datafilesync, I could see on logs that we have a increment in client connections to database. When datafilesync is finished, then the client connections drops to the baseline (see attached file). We see this pattern everytime that a datafilesync line is registered on the log.

      I made a test when Datafilesync was in action to recieve one document from a collection (db.test.findOne()), and it took about 10 seconds.

      I reviewed the following article:
      http://docs.mongodb.org/manual/reference/command/fsync/

      And check the following function

      serverIsLocked = function () {
      var co = db.currentOp();
      if (co && co.fsyncLock)

      { return true; }

      return false;
      }

      But when I run this function, I always see that the server is not locked.

        1. mongo_datafilesync.txt
          102 kB

            Assignee:
            Mark Benvenuto
            Reporter:
            David Verdejo
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              Created:
              Updated:
              Resolved: