could only be replicated to 0 nodes instead of minReplication (=1). There are 1 datanode(s) running

Hadoop Java API 开发操作时hdfs 时出现如下错误： 先翻译一把： could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running 只能复制到0个节点，而不是minReplication（=1）。有一个datanode（s）运行 就是说：多个no

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