Hadoop put命令抛出 - 只能复制到0个节点，而不是1个

时间：2014-11-26 10:45:31

标签： hadoop

我是Hadoop的新手，我正在尝试在我的ubuntu机器上进行伪分布式模式设置，并面临hadoop put命令的问题。我的配置详细信息可在此文章中找到 - ＆gt; What the command "hadoop namenode -format" will do

现在我尝试使用以下命令将一些文件添加到HDFS：

hadoop fs –mkdir /user/myuser

hadoop fs -lsr /

$ ./hadoop fs -lsr /
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:04 /tmp
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:04 /tmp/hadoop-myuser
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:04 /tmp/hadoop-myuser/dfs
-rw-r--r--   1 myuser supergroup          0 2014-11-26 16:04 /tmp/hadoop-myuser/dfs/name
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:04 /tmp/hadoop-myuser/mapred
drwx------   - myuser supergroup          0 2014-11-26 16:12 /tmp/hadoop-myuser/mapred/system
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:04 /user
drwxr-xr-x   - myuser supergroup          0 2014-11-26 16:06 /user/myuser

现在我正在运行put命令，但是会出现这样的异常：

$ ./hadoop fs -put example.txt .
14/11/26 16:06:19 WARN hdfs.DFSClient: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/myuser/example.txt could only be replicated to 0 nodes, instead of 1
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1920)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:783)
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1432)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1428)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1426)

    at org.apache.hadoop.ipc.Client.call(Client.java:1113)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
    at com.sun.proxy.$Proxy1.addBlock(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62)
    at com.sun.proxy.$Proxy1.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3720)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3580)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2783)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:3023)

14/11/26 16:06:19 WARN hdfs.DFSClient: Error Recovery for null bad datanode[0] nodes == null
14/11/26 16:06:19 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/myuser/example.txt" - Aborting...
put: java.io.IOException: File /user/myuser/example.txt could only be replicated to 0 nodes, instead of 1
14/11/26 16:06:19 ERROR hdfs.DFSClient: Failed to close file /user/myuser/example.txt
org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/myuser/example.txt could only be replicated to 0 nodes, instead of 1
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1920)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:783)
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1432)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1428)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1426)

    at org.apache.hadoop.ipc.Client.call(Client.java:1113)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
    at com.sun.proxy.$Proxy1.addBlock(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62)
    at com.sun.proxy.$Proxy1.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3720)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3580)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2783)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:3023)

有人可以帮助我如何解决这个问题？

解决问题的方法：

根据提供的答案，我可以按照以下步骤解决问题：

1）停止所有服务：

./stop-all.sh

2）删除数据目录：

rm -rf /tmp/hadoop-myuser/dfs/data/

3）启动服务：

./start-all.sh

4）然后将文件放入HDFS：

./hadoop fs -put example.txt .

2 个答案:

答案 0 :(得分：3)

这是由于数据节点问题。 启动您的datanode 并立即执行操作

答案 1 :(得分：1)

您是否在＆＃34; hdfs-site.xml＆＃34; 检查＆＃34; dfs.replication＆＃34; 至少1.我认为你可能会放0复制。

还检查所有hadoop服务是否正在运行？

检查运行状态： 运行JPS命令

单独启动服务： 转到...\hadoop\bin\ 

start hadoop {datanode \ namenode}
start yarn {nodemanager \ resourcemanager}
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