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用java代码上传文件到hadoop报异常,并且上传了一个0b的文件

ycl0510 2017-11-08 22:44:44 2490

我刚开始学大数据,用虚拟机写了hadoop集群,后来在阿里云上租了区同分区的服务器也搭了hadoop集群,可以正常运行,并且在公网访问页面。但是学习到用java代码上传文件到hadoop时出现了问题。

java代码如下:
public static void main(String[] args) throws Exception {

    Configuration conf = new Configuration();
    conf.set("fs.defaultFS", "hdfs://47.100.7.108:9000");
    FileSystem fs = FileSystem.get(new URI("hdfs://47.100.7.108:9000"), conf, "root");
    fs.copyFromLocalFile(new Path("D:/2.txt"), new Path("/"));
    fs.close();
}

错误如下:
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /2.txt could only be replicated to 0 nodes instead of minReplication (=1). There are 2 datanode(s) running and 2 node(s) are excluded in this operation.

at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1628)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3121)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3045)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:725)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:493)
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$1.run(Server.java:2217)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1746)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)
at org.apache.hadoop.ipc.Client.call(Client.java:1475)
at org.apache.hadoop.ipc.Client.call(Client.java:1412)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:418)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy10.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1459)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1255)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)

namenode错误如下:
2017-11-08 22:20:41,562 INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on 9000, call org.apache.hadoop.hdfs.protocol.ClientProtocol.addBlock from 101.47.25.128:57083 Call#9 Retry#0
java.io.IOException: File /2.txt could only be replicated to 0 nodes instead of minReplication (=1). There are 2 datanode(s) running and 2 node(s) are excluded in this operation.

at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1628)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3121)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3045)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:725)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:493)
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$1.run(Server.java:2217)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1746)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)

2017-11-08 22:29:41,050 INFO logs: Aliases are enabled

-------------分隔--------------
1、datanode没有报错。2、这个代码上传文件到虚拟机的hadoop集群结果正常。3、重新格式化hadoop,重装系统过,无效。4、文件还是能在hadoop创建,但是文件大小为0b。5、下载也一样,能下载但是文件大小为0b。6、防火墙全关,也可相互免密登录。7、阿里云端口权限全开。
QQ_20171108224039

强迫症找不到原因很难受。

分布式计算 Hadoop Java 大数据 网络安全
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全部回答(2)
  • 1113811233430259
    2019-07-17 21:42:57

    楼主 您好! 我现在遇到了和你一样的问题,方法1试过,端口不会成功启动,方法2不知道怎么弄,方法3我没太明白,能细说一下吗?谢谢啦

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  • ycl0510
    2019-07-17 21:42:57

    已解决
    阿里云上的集群是以内网连接的,当下载或者上传的时候,服务器返回给客户端的ip是自身内网ip,所以无法实现上传下载
    猜想解决方法:
    1.hadoop集群的搭建采用外网连接(没尝试过)
    2.想办法让自己连接的时候连内网,返回ip的时候返回外网ip(没尝试过,有印象有人提到过相关)
    3.在windows上设置master和slave等ip映射,Configuration设置"dfs.client.use.datanode.hostname"为true,让返回的ip为hostname的形式,这样hadoop集群自身运行的时候访问内网,客户端也可以根据hostname用外网访问。(已验证)

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