hadoop报错：hadoop.security.AccessControlException: Permission denied: user=liyang, access=WRITE-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_39435629/article/details/102461970

本文详细解析了在使用IDEA通过Hadoop保存文件时遇到的权限问题，具体表现为AccessControlException错误，原因是用户liyang尝试写入/user/hadoop目录下没有足够权限的文件。文章提供了检查和调整HDFS文件权限的方法，以解决此问题。

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hadoop在通过idea进行文件保存时，

 @Test
    public void putFile() throws Exception {
        Configuration conf = new Configuration();

        FileSystem fs = FileSystem.get(conf);
        
        FSDataOutputStream fout = fs.create(new Path("hdfs://mycluster/user/hadoop/2019-10-9/a.txt"));
        fout.write("how are you 你好吗?".getBytes());
        fout.close();
    }

提醒该错误：

org.apache.hadoop.security.AccessControlException: Permission denied: user=liyang, access=WRITE, inode="/user/hadoop/2019-10-9/a.txt":hadoop:supergroup:drwxr-xr-x
	at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:319)
	at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:292)
	at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:213)
	at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:190)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1728)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1712)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkAncestorAccess(FSDirectory.java:1695)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:2515)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:2450)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:2334)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:624)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:397)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

经过查看是由于 /user/hadoop的文件权限