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

Hadoop Java API 開發操作時hdfs 時出現如下錯誤： 先翻譯一把： could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running 只能複製到0個節點，而不是minReplication（=1）。有一個datanode（s）運行 就是說：多個no

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