org.apache.hadoop.ipc.RemoteException(java.io.IOException):?File /hdfsapi/test/c.txt could only be replicated to 0 nodes instead of minReplication (=1). ?There are 1 datanode(s) running and 1 node(s) are excluded in this operation. ?at?org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1595) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3287) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:677)...datanode 正常啟動 ?防火墻關閉了 ?調用創建文件夾的API是成功的在命令行使用hadoop fs ?所有操作也正常在瀏覽器看到文件大小為0 ?求解釋？？？