MongoDB-Java驱动程序性能 [英] MongoDB - Java Driver performance

问题描述

这是我的环境.

Java-Oracle 1.7版

Java - 1.7 by Oracle

mongod v2.4.5(在Mongolab中)

mongod v2.4.5 (in Mongolab)

我发现两个MongoDB驱动程序的性能有所不同(2.9.3与2.11.2)

I found difference in performance of the two MongoDB driver(2.9.3 vs 2.11.2)

当我使用每个驱动程序运行相同的代码时，2.11.2比2.9.3慢.

When I run same code using each driver, 2.11.2 slower than 2.9.3.

   for(int i=0; i<1000; i++){
        BasicDBObject doc = new BasicDBObject(
                "currentTime",
                new SimpleDateFormat("HH:mm:ss:SSS").format(Calendar.getInstance().getTime())
        );
        coll.insert(doc);
    }

    DBCursor cursor = coll.find();
    try{
        while(cursor.hasNext()){
            System.out.println(cursor.next());
        }
    } finally {
        cursor.close();
    }

上面的代码是将1000个文档放入MongoDB.

The above code is to put 1000 document to MongoDB.

在驱动程序2.9.3中，需要1到2秒.但在2.11.2中，则需要花费超过1分钟的时间.

In driver 2.9.3, it takes 1~2 sec. but in 2.11.2, it takes more than 1 minute.

有人知道这个问题吗?

推荐答案

对于Java驱动程序，自V 2.10.0开始，默认写关注已从NORMAL更改为SAFE请参阅此处

Default Write concern has changed from NORMAL to SAFE for Java driver since V 2.10.0 See here

这意味着在较旧的驱动程序版本中，默认情况下，插入操作会在消息写入套接字后立即返回.

This means that in the older driver version insert operations by default return as soon as a message is written to socket.

另一方面，在较新的驱动程序版本中，默认情况下，操作必须在返回之前由服务器确认，这要慢得多.

In the newer driver version on the other hand, operations by default must be acknowledged by the server before returning, which is much slower.

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