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我在 Amazon EC2 上设置了一个包含两个节点的 hadoop 集群。它运作良好。我可以使用hadoop api（附加java程序）从主节点或与hadoop集群相同的亚马逊区域中的其他实例将数据上传到HDFS。

但是，当我想从我的本地非 hadoop 机器上执行此操作时，结果如下所示：

然后我登录到 hadoop 名称节点以使用命令行进行检查。创建文件夹“testdir”，但上传文件“myfile”的大小为0。

==================这是分隔符============================= ==

这些是例外

Apr 18, 2013 10:40:47 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream createBlockOutputStream
INFO: Exception in createBlockOutputStream 10.196.153.215:50010 java.net.ConnectException: Connection timed out
Apr 18, 2013 10:40:47 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream nextBlockOutputStream
INFO: Abandoning block blk_560654195674249927_1002
Apr 18, 2013 10:40:47 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream nextBlockOutputStream
INFO: Excluding datanode 10.196.153.215:50010
Apr 18, 2013 10:41:09 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream createBlockOutputStream
INFO: Exception in createBlockOutputStream 10.195.171.154:50010 java.net.ConnectException: Connection timed out
Apr 18, 2013 10:41:09 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream nextBlockOutputStream
INFO: Abandoning block blk_1747509888999401559_1002
Apr 18, 2013 10:41:10 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream nextBlockOutputStream
INFO: Excluding datanode 10.195.171.154:50010
Apr 18, 2013 10:41:10 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer run
WARNING: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/ubuntu/testdir/myfile could only be replicated to 0 nodes, instead of 1
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1558)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:696)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)

    at org.apache.hadoop.ipc.Client.call(Client.java:1070)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
    at $Proxy1.addBlock(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    at $Proxy1.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3510)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3373)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2589)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2829)

Apr 18, 2013 10:41:10 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream processDatanodeError
WARNING: Error Recovery for block blk_1747509888999401559_1002 bad datanode[0] nodes == null
Apr 18, 2013 10:41:10 AM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream processDatanodeError
WARNING: Could not get block locations. Source file "/user/ubuntu/testdir/myfile" - Aborting...
Exception in thread "main" org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/ubuntu/testdir/myfile could only be replicated to 0 nodes, instead of 1
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1558)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:696)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)

    at org.apache.hadoop.ipc.Client.call(Client.java:1070)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
    at $Proxy1.addBlock(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    at $Proxy1.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3510)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3373)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2589)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2829)

==================这是分隔符============================= ==

这是我的java代码 

Path output = new Path("testdir");
Configuration conf = new Configuration();
conf.set("fs.default.name", "hdfs://ec2-23-22-12-173.compute-1.amazonaws.com:9000");
conf.set("hadoop.job.user",ubuntu);

FileSystem.mkdirs(FileSystem.get(conf), output, FsPermission.valueOf("drwxr-xr-x"));
FileSystem fs = FileSystem.get(conf);
fs.copyFromLocalFile(new Path("./myfile"), output);

==================这是分隔符============================= == PS。我已经在安全组中打开了端口 9000、50010 并且已经关闭了 linux 防火墙。

有人有什么想法吗？

谢谢。

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2 回答 2

1

你找到这个问题的任何答案了吗...如果没有，这里是潜在的“原因”==>您的客户端正在尝试从 EC2 上的私有 IP 地址访问数据节点（仅对集群可见）不是公共IP。您可以验证查看您的错误日志：不包括 datanode 私有 ip 而不是公共 ip，但我不知道我们将如何克服这一点。我有同样的问题。有关更多信息，请查看此链接：http ://www.hadoopinrealworld.com/could-only-be-replicated-to-0-nodes/

于 2015-03-12T12:29:56.667 回答
1

此错误背后可能有几个原因： 1- DataNodes 未启动并运行。确保不是这种情况。如果您没有得到任何东西，请尝试挖掘每台服务器上的 DN 日志。

2- 运行 DN 的机器上的空间小于您通过“dfs.datanode.du.reserved”属性指定的空间。

3-您的 DN 机器上实际上没有剩余空间。

4- hdfs-site.xml 文件中“dfs.data.dir”指定的路径没有剩余空间。（可能作为 dfs.data.dir 的磁盘空间不足）。

5- DN 无法向 NN 发送心跳/块报告。确保没有网络相关问题。

高温高压

于 2013-04-21T21:22:44.237 回答