Dropped write during insert loop with retry_writes on

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    • Type: Bug
    • Resolution: Done
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Shell
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      1. Start a MongoDB 3.6.2 replica set with FCV 3.6
      2. Start a loop in the mongo shell to insert 10,000 documents with retry_writes set to true:

      use test
db = db.getMongo().startSession({retry_writes: true}).getDatabase(db.getName());
for (i = 0; i < 10000; i++) { db.test.insert({}); }

      3. While the inserts are happening issue an rs.stepDown() command on the primary
      4. The insert loop will eventually finish but db.test.count() will indicate that only 9,999 documents have been inserted.

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      1. Start a MongoDB 3.6.2 replica set with FCV 3.6 2. Start a loop in the mongo shell to insert 10,000 documents with retry_writes set to true: use test db = db.getMongo().startSession({retry_writes: true}).getDatabase(db.getName()); for (i = 0; i < 10000; i++) { db.test.insert({}); } 3. While the inserts are happening issue an rs.stepDown() command on the primary 4. The insert loop will eventually finish but db.test.count() will indicate that only 9,999 documents have been inserted.
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      max.hirschhorn suggested I file this ticket.

      If I start a an insert loop that attempts to insert 10,000 documents with retry_writes on and then step down the primary only 9,999 documents are inserted.

      MongoDB is running with FCV 3.6.

        1. new-primary.log
          22 kB
        2. old-primary.log
          28 kB

            Assignee:
            Max Hirschhorn
            Reporter:
            Timothy Olsen (Inactive)
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              Created:
              Updated:
              Resolved: