You'll find one namenode and one secondary namenode in a Hadoop cluster.

在每个Hadoop集群中可以找到一个namenode和一个secondary namenode。

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There's also a secondary namenode, which isn't a redundant daemon for the namenode but instead provides period checkpointing and housekeeping tasks.

还有一个 secondary namenode，它不是 namenode 的冗余守护进程，而是提供周期检查点和清理任务。

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