FAQ
Hi Balakrishna,

In your host file, please replace the 2nd 127.0.0.1 by your local IP and
retry.

Like:
127.0.0.1 localhost
192.168.1.2 ubuntu

You can also add the FQDN:
127.0.0.1 localhost
192.168.1.2 ubuntu ubuntu.my.domain.name

JM


2013/5/15 Balakrishna Dhanekula <balakrishna.dhanekula.cts@gmail.com>
Hi,

When trying to run the job I am getting this exception. I am using Apache
Hadoop 1.1.1 version. I could see all the services started successfully.

Can some one please help me.

My entries in the /etc/hosts file are:

**********************************************
127.0.0.1 localhost
127.0.0.1 ubuntu

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

********************************************************************************

hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar pi
3 10
Number of Maps = 3
Samples per Map = 10
java.net.ConnectException: Call From ubuntu/127.0.0.1 to ubuntu:8020
failed on connection exception: java.net.ConnectException: Connection
refused; For more details see:
http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:779)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:726)
at org.apache.hadoop.ipc.Client.call(Client.java:1229)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
at $Proxy9.getFileInfo(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:164)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
at $Proxy9.getFileInfo(Unknown Source)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:628)
at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1545)
at
org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:805)
at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1367)
at
org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:269)
at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:144)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
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.util.RunJar.main(RunJar.java:208)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
at
org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
at
org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:499)
at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:593)
at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:241)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1278)
at org.apache.hadoop.ipc.Client.call(Client.java:1196)
... 29 more
hduser@ubuntu:~/hadoop111/bin$

Search Discussions

  • Balakrishna Dhanekula at May 15, 2013 at 6:48 pm
    Hi,

    When trying to run the job I am getting this exception. I am using Apache
    Hadoop 1.1.1 version. I could see all the services started successfully.

    Can some one please help me.

    My entries in the /etc/hosts file are:

    **********************************************
    127.0.0.1 localhost
    127.0.0.1 ubuntu

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts
    ********************************************************************************

    hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar pi 3
    10
    Number of Maps = 3
    Samples per Map = 10
    java.net.ConnectException: Call From ubuntu/127.0.0.1 to ubuntu:8020 failed
    on connection exception: java.net.ConnectException: Connection refused; For
    more details see: http://wiki.apache.org/hadoop/ConnectionRefused
         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
         at
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
         at
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
         at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
         at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:779)
         at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:726)
         at org.apache.hadoop.ipc.Client.call(Client.java:1229)
         at
    org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
         at $Proxy9.getFileInfo(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:164)
         at
    org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
         at $Proxy9.getFileInfo(Unknown Source)
         at
    org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:628)
         at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1545)
         at
    org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:805)
         at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1367)
         at org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:269)
         at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
         at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
         at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:597)
         at
    org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
         at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:144)
         at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
         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.util.RunJar.main(RunJar.java:208)
    Caused by: java.net.ConnectException: Connection refused
         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
         at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
         at
    org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
         at
    org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:499)
         at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:593)
         at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:241)
         at org.apache.hadoop.ipc.Client.getConnection(Client.java:1278)
         at org.apache.hadoop.ipc.Client.call(Client.java:1196)
         ... 29 more
    hduser@ubuntu:~/hadoop111/bin$
  • Balakrishna Dhanekula at May 16, 2013 at 4:24 pm
    Hi JM,

    Actually I am using Apache Hadoop 1.1.1 not the cloudera installer.

    When I run the file system check I get the same error.

    Thanks,
    Bala.

    On Wednesday, May 15, 2013 11:17:56 PM UTC+5:30, Balakrishna Dhanekula
    wrote:
    Hi,

    When trying to run the job I am getting this exception. I am using Apache
    Hadoop 1.1.1 version. I could see all the services started successfully.

    Can some one please help me.

    My entries in the /etc/hosts file are:

    **********************************************
    127.0.0.1 localhost
    127.0.0.1 ubuntu

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts

    ********************************************************************************

    hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar pi
    3 10
    Number of Maps = 3
    Samples per Map = 10
    java.net.ConnectException: Call From ubuntu/127.0.0.1 to ubuntu:8020
    failed on connection exception: java.net.ConnectException: Connection
    refused; For more details see:
    http://wiki.apache.org/hadoop/ConnectionRefused
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
    Method)
    at
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:779)
    at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:726)
    at org.apache.hadoop.ipc.Client.call(Client.java:1229)
    at
    org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
    at $Proxy9.getFileInfo(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:164)
    at
    org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
    at $Proxy9.getFileInfo(Unknown Source)
    at
    org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:628)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1545)
    at
    org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:805)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1367)
    at
    org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:269)
    at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
    org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
    at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:144)
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
    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.util.RunJar.main(RunJar.java:208)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at
    org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
    at
    org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:499)
    at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:593)
    at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:241)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1278)
    at org.apache.hadoop.ipc.Client.call(Client.java:1196)
    ... 29 more
    hduser@ubuntu:~/hadoop111/bin$
  • Serega Sheypak at May 16, 2013 at 5:34 pm
    Please provide ping ubuntu output from the host where you do submit the job.
    Please do the same for tracert.
    Please provide ifconfig from submission host
    15.05.2013 19:48 пользователь "Balakrishna Dhanekula" <
    balakrishna.dhanekula.cts@gmail.com> написал:
    Hi,

    When trying to run the job I am getting this exception. I am using Apache
    Hadoop 1.1.1 version. I could see all the services started successfully.

    Can some one please help me.

    My entries in the /etc/hosts file are:

    **********************************************
    127.0.0.1 localhost
    127.0.0.1 ubuntu

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts

    ********************************************************************************

    hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar pi
    3 10
    Number of Maps = 3
    Samples per Map = 10
    java.net.ConnectException: Call From ubuntu/127.0.0.1 to ubuntu:8020
    failed on connection exception: java.net.ConnectException: Connection
    refused; For more details see:
    http://wiki.apache.org/hadoop/ConnectionRefused
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
    Method)
    at
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:779)
    at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:726)
    at org.apache.hadoop.ipc.Client.call(Client.java:1229)
    at
    org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
    at $Proxy9.getFileInfo(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:164)
    at
    org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
    at $Proxy9.getFileInfo(Unknown Source)
    at
    org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:628)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1545)
    at
    org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:805)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1367)
    at
    org.apache.hadoop.examples.PiEstimator.estimate(PiEstimator.java:269)
    at org.apache.hadoop.examples.PiEstimator.run(PiEstimator.java:342)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.examples.PiEstimator.main(PiEstimator.java:351)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
    org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
    at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:144)
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
    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.util.RunJar.main(RunJar.java:208)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at
    sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at
    org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:525)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
    at
    org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:499)
    at
    org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:593)
    at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:241)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1278)
    at org.apache.hadoop.ipc.Client.call(Client.java:1196)
    ... 29 more
    hduser@ubuntu:~/hadoop111/bin$
  • Jean-Marc Spaggiari at May 16, 2013 at 2:17 am
    Hi Bala,

    Before trying the pi example, have you verified that you hadoop server is
    working fine? What do you have in the logs? What on the Hadoop interface?
    Is Cloudera Manager telling you that hadoop is up and running?

    Are simple commands like hadoop fs -ls working fine?

    JM


    2013/5/15 Balakrishna Dhanekula <balakrishna.dhanekula.cts@gmail.com>
    Hi Jean-Marc Spaggiari,

    Thanks for taking interest and replying.

    I have changed the the hosts entries as

    root@ubuntu:/etc# cat hosts
    127.0.0.1 localhost
    192.168.1.102 ubuntu

    Moreover I have a dynamic ip provided by my Internet provider. Every time
    I connect to Internet I get a new ip address.

    I am still having the same problem here's the error:

    ******************************************************************************************************************************************

    hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar pi
    3 10
    Number of Maps = 3
    Samples per Map = 10
    java.net.ConnectException: Call From ubuntu/192.168.1.102 to ubuntu:8020
    failed on connection exception: java.net.ConnectException: Connection
    refused; For more details see:
    http://wiki.apache.org/hadoop/ConnectionRefused
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
    Method)

    ******************************************************************************************************************



    Thanks,
    Bala.

    On Wednesday, May 15, 2013 11:21:57 PM UTC+5:30, Jean-Marc Spaggiari wrote:

    Hi Balakrishna,

    In your host file, please replace the 2nd 127.0.0.1 by your local IP and
    retry.

    Like:
    127.0.0.1 localhost
    192.168.1.2 ubuntu

    You can also add the FQDN:
    127.0.0.1 localhost
    192.168.1.2 ubuntu ubuntu.my.domain.name

    JM


    2013/5/15 Balakrishna Dhanekula <balakrishna....@**gmail.com>

    Hi,
    When trying to run the job I am getting this exception. I am using
    Apache Hadoop 1.1.1 version. I could see all the services started
    successfully.

    Can some one please help me.

    My entries in the /etc/hosts file are:

    ************************************************
    127.0.0.1 localhost
    127.0.0.1 ubuntu

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts
    ****************************************************************
    ********************

    hduser@ubuntu:~/hadoop111/bin$ hadoop jar ../hadoop-examples-1.1.1.jar
    pi 3 10
    Number of Maps = 3
    Samples per Map = 10
    java.net.ConnectException: Call From ubuntu/127.0.0.1 to ubuntu:8020
    failed on connection exception: java.net.ConnectException: Connection
    refused; For more details see: http://wiki.apache.org/hadoop/**
    ConnectionRefused <http://wiki.apache.org/hadoop/ConnectionRefused>
    at sun.reflect.**NativeConstructorAccessorImpl.**newInstance0(Native
    Method)
    at sun.reflect.**NativeConstructorAccessorImpl.**newInstance(**
    NativeConstructorAccessorImpl.**java:39)
    at sun.reflect.**DelegatingConstructorAccessorI**mpl.newInstance(**
    DelegatingConstructorAccessorI**mpl.java:27)
    at java.lang.reflect.Constructor.**newInstance(Constructor.java:**
    513)
    at org.apache.hadoop.net.**NetUtils.wrapWithMessage(**
    NetUtils.java:779)
    at org.apache.hadoop.net.**NetUtils.wrapException(**
    NetUtils.java:726)
    at org.apache.hadoop.ipc.Client.**call(Client.java:1229)
    at org.apache.hadoop.ipc.**ProtobufRpcEngine$Invoker.**
    invoke(ProtobufRpcEngine.java:**202)
    at $Proxy9.getFileInfo(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:**164)
    at org.apache.hadoop.io.retry.**RetryInvocationHandler.invoke(**
    RetryInvocationHandler.java:**83)
    at $Proxy9.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.**protocolPB.**
    ClientNamenodeProtocolTranslat**orPB.getFileInfo(**
    ClientNamenodeProtocolTranslat**orPB.java:628)
    at org.apache.hadoop.hdfs.**DFSClient.getFileInfo(**
    DFSClient.java:1545)
    at org.apache.hadoop.hdfs.**DistributedFileSystem.**getFileStatus(**
    DistributedFileSystem.java:**805)
    at org.apache.hadoop.fs.**FileSystem.exists(FileSystem.**java:1367)
    at org.apache.hadoop.examples.**PiEstimator.estimate(**
    PiEstimator.java:269)
    at org.apache.hadoop.examples.**PiEstimator.run(PiEstimator.**
    java:342)
    at org.apache.hadoop.util.**ToolRunner.run(ToolRunner.**java:70)
    at org.apache.hadoop.examples.**PiEstimator.main(PiEstimator.**
    java:351)
    at sun.reflect.**NativeMethodAccessorImpl.**invoke0(Native Method)
    at sun.reflect.**NativeMethodAccessorImpl.**invoke(**
    NativeMethodAccessorImpl.java:**39)
    at sun.reflect.**DelegatingMethodAccessorImpl.**invoke(**
    DelegatingMethodAccessorImpl.**java:25)
    at java.lang.reflect.Method.**invoke(Method.java:597)
    at org.apache.hadoop.util.**ProgramDriver$**
    ProgramDescription.invoke(**ProgramDriver.java:72)
    at org.apache.hadoop.util.**ProgramDriver.driver(**
    ProgramDriver.java:144)
    at org.apache.hadoop.examples.**ExampleDriver.main(**
    ExampleDriver.java:64)
    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.util.RunJar.**main(RunJar.java:208)
    Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.**checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.**finishConnect(**
    SocketChannelImpl.java:567)
    at org.apache.hadoop.net.**SocketIOWithTimeout.connect(**
    SocketIOWithTimeout.java:207)
    at org.apache.hadoop.net.**NetUtils.connect(NetUtils.**java:525)
    at org.apache.hadoop.net.**NetUtils.connect(NetUtils.**java:489)
    at org.apache.hadoop.ipc.Client$**Connection.setupConnection(**
    Client.java:499)
    at org.apache.hadoop.ipc.Client$**Connection.setupIOstreams(**
    Client.java:593)
    at org.apache.hadoop.ipc.Client$**Connection.access$2000(Client.**
    java:241)
    at org.apache.hadoop.ipc.Client.**getConnection(Client.java:**1278)
    at org.apache.hadoop.ipc.Client.**call(Client.java:1196)
    ... 29 more
    hduser@ubuntu:~/hadoop111/bin$

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