Not able to run hdfs commands

0 votes

I have setup hadoop in my system yesterday and it worked fine. I ran different hdfs commands and got expected results. Today I switched on my system and tried the command

hdfs dfs -ls /

but it didn't work. I got the following error:

19/01/02 14:59:18 WARN ipc.Client: Failed to connect to server: localhost/127.0.0.1:9000: try once and fail.
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
    at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:685)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:788)
    at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:410)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1550)
    at org.apache.hadoop.ipc.Client.call(Client.java:1381)
    at org.apache.hadoop.ipc.Client.call(Client.java:1345)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
    at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:796)
    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:409)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)
    at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1649)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1440)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1437)
    at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
    at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1437)
    at org.apache.hadoop.fs.Globber.getFileStatus(Globber.java:64)
    at org.apache.hadoop.fs.Globber.doGlob(Globber.java:269)
    at org.apache.hadoop.fs.Globber.glob(Globber.java:148)
    at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:1686)
    at org.apache.hadoop.fs.shell.PathData.expandAsGlob(PathData.java:326)
    at org.apache.hadoop.fs.shell.Command.expandArgument(Command.java:245)
    at org.apache.hadoop.fs.shell.Command.expandArguments(Command.java:228)
    at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:103)
    at org.apache.hadoop.fs.shell.Command.run(Command.java:175)
    at org.apache.hadoop.fs.FsShell.run(FsShell.java:317)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
    at org.apache.hadoop.fs.FsShell.main(FsShell.java:380)
ls: Call From edureka.cdh.com/1.1.1.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
Jan 3, 2019 in Big Data Hadoop by slayer
 • 29,370 points • 3,200 views

1 answer to this question.

0 votes

Because you said it ran yesterday and did not run today when you "switched on" your system, I am guessing the hadoop daemons are not running.

run the jps command to check if the daemons are running.

If not, use the following command to start the daemons:

cd $HADOOP_HOME/sbin
./start-all.sh
answered Jan 3, 2019 by Omkar
 • 69,220 points

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