Question

我的代码有一个例外：要测试tailable游标，请在此程序运行时手动将文档插入test.capped集合，并验证它们是否已回显到控制台窗口。

public static class Program
{

    public static void Main(string[] args)
    {


        try
        {
            var server = MongoServer.Create("mongodb://distnatserver/?safe=true");
            var database = server["test"];



            if (database.CollectionExists("capped"))
            {
                database.DropCollection("capped");
            }
            var collectionOptions = CollectionOptions.SetCapped(true).SetMaxDocuments(5);
            var commandResult = database.CreateCollection("capped", collectionOptions);
            var collection = database["capped"];



            BsonValue lastId = BsonMinKey.Value;
            while (true)
            {
                var query = Query.GT("_id", lastId);
                var cursor = collection.Find(query)
                    .SetFlags(QueryFlags.TailableCursor | QueryFlags.AwaitData)
                    .SetSortOrder("$natural");
                using (var enumerator = (MongoCursorEnumerator<BsonDocument>)cursor.GetEnumerator())
                {
                    while (true)
                    {
                        if (enumerator.MoveNext())
                        {
                            var document = enumerator.Current;
                            lastId = document["_id"];
                            ProcessDocument(document);
                        }
                        else {
                            if (enumerator.IsDead)
                            {
                                break;
                            }
                            if (!enumerator.IsServerAwaitCapable)
                            {
                                Thread.Sleep(TimeSpan.FromMilliseconds(100));
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Unhandled exception:");
            Console.WriteLine(ex);
        }

        Console.WriteLine("Press Enter to continue");
        Console.ReadLine();
    }

    private static void ProcessDocument(
        BsonDocument document
    )
    {
        Console.WriteLine(document.ToJson());
    }
}

未处理的异常： MongoDB.Driver.MongoCommandException：Command＆＃39; create＆＃39;失败：指定大小：当上限为真时（响应：{＆＃34; ok＆＃34;：0.0，＆＃34; errmsg＆＃34;：＆＃34;指定大小：当上限为真时＆＃34;，＆＃ 34;代码＆＃34;：14832}）

Answer 1

根据documentation，在创建上限集合时，您必须以字节为单位指定集合的最大大小，例如：

db.createCollection( "log", { capped: true, size: 100000 } )

MongoDB指定大小异常

1 个答案: