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POC# Driver SafeMode off Upserts - not all records updated/inserted
 

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    <p>In our application we are doing large amounts of inserts/updates (anywhere from 1k to 100k) and I noticed that not all records are being saved. It saves between 90%-95% of records with safemode off. </p> <p>Doing the upsert with safemode on upserts all records successfully but is much too slow. I remember reading somewhere that even with safemode off there should be no reason an update/insert should fail unless the server is unavailable.</p> <p>I wrote a small app to test this, and have included the code below. It tries to insert 100,000 ints into Mongo, and when checked after it is run I see about 90,000 records in the collection. </p> <p>(Note: I am using Parallel updating, since I am updating by _id and Mongo 2.0 supports parallel operations when using _id. When not using Parallel.Foreach I still see some loss of records though not as great)</p> <pre><code> MongoServer server = MongoServer.Create(host); MongoDatabase test = server.GetDatabase("testDB"); var list = Enumerable.Range(0, 100000).ToList(); using (server.RequestStart(test)) { MongoCollection coll = test.GetCollection("testCollection"); Parallel.ForEach(list, i =&gt; { var query = new QueryDocument("_id", i); coll.Update(query, Update.Set("value",100), UpdateFlags.Upsert, SafeMode.False);; }); } </code></pre> <p>So I guess my question is: What is the best way to do large numbers of updates fast, with 100% success rate?</p> <p>I can't use insert because I have a number of processes writing to Mongo and cannot be sure of whether a certain document exists or not , which is why I am using Upsert.</p>
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