刚开始装好hadoop的时候,namenode机上传文件没有错误,今天打开时突然不能上传文件,报错 put: File /a.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 3 datanode(s) running and 3 node(s) are excluded in this operation. 上网查了一下,先把,nnamenode和datanod…