MapReduce适合于一次写入多次读取的应用场景，而一个关系型数据库擅长于频繁地更新应用。

MapReduce suits applications where the data is written once and read many times, whereas a relational database is good for datasets that are continually updated.

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MapReduce适合于一次写入多次读取的应用场景，而一个关系型数据库擅长于频繁地更新应用。

MapReduce suits applications where the data is written once and read many times, whereas a relational database is good for datasets that are continually updated.

youdao