1. 问题描述
   在使用hdfs api追加内容操作，从windows电脑上的idea对aliyun服务器上的hdfs中的文件追加内容时，出现错误，如下：

   java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to no more good datanodes being available to try. (Nodes: current=[DatanodeInfoWithStorage[172.25.55.228:9866,DS-6ba619cf-5189-45c7-8dbc-56afa381ab0b,DISK]], original=[DatanodeInfoWithStorage[172.25.55.228:9866,DS-6ba619cf-5189-45c7-8dbc-56afa381ab0b,DISK]]). The current failed datanode replacement policy is DEFAULT, and a client may configure this via ‘dfs.client.block.write.replace-datanode-on-failure.policy’ in its configuration.
   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:918)atorg.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:984)
   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1131)atorg.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:455)

   截图：
   

2. 问题解决
   在idea代码中添加

configuration.set("dfs.client.block.write.replace-datanode-on-failure.policy", "NEVER");