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

缺乏、安全感 2022-05-21 08:18 211阅读 0赞

Hadoop Java API 开发操作时hdfs 时出现如下错误：

先翻译一把：

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

只能复制到0个节点，而不是minReplication（=1）。有一个datanode（s）运行

就是说：多个nodedata要做副本处理，结果当前只有一个节点，但是不能到这一个节点。因此失败：为什么失败呢 ？？？

就是尼玛的端口问题，不知道的朋友，把Linux的防火墙关了即可：

或者加上这一个行：centos7  的解决办法，50020、50010 端口开启即可：

\# firewall-cmd --permanent --add-port=50020/tcp

\# firewall-cmd --permanent --add-port=50010/tcp

然后再重启防火墙：systemctl restart firewalld.service

org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /hdfsapi/test/liuxing1.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.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)  
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)  
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)  
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)  
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:1693)

at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)

![70][]

端口开启就是：50010

Hadoop 端口使用的详情：  
https://blog.csdn.net/jeffiny/article/details/78728965

[70]: /images/20220521/92cd6faa9caa4698bd3ad9a9999f999c.png