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我是 cassandra 的新手，我需要实现 map-reduce 功能来实现聚合功能。
请让我知道执行此操作的步骤。我机cassandra 2.0上有windows。我已经通过word_count示例但不明白我是否需要安装 hadoop 作为此的先决条件。
cassandra 2.0
windows
word_count