title: Hadoop cluster setup - java.net.ConnectException: Connection refused
body: <p>I want to setup a hadoop-cluster in pseudo-distributed mode. I managed to perform all the setup-steps, including startuping a Namenode, Datanode, Jobtracker and a Tasktracker on my machine.</p>
  
  <p>Then I tried to run some exemplary programms and faced the <code>java.net.ConnectException: Connection refused</code> error. I stepped back to the very first steps of running some operations in standalone mode and faced the same problem. </p>
  
  <p>I performed even <em>triple-check</em> of all the installation steps and have no idea how to fix it. (I am new to Hadoop and a beginner Ubuntu user thus I kindly ask you for "taking it into account" if providing any guide or tip).  </p>
  
  <p>This is the <strong>error output</strong> I keep receiving: </p>
  
  <pre><code>hduser@marta-komputer:/usr/local/hadoop$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar grep input output 'dfs[a-z.]+'
  15/02/22 18:23:04 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  15/02/22 18:23:04 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
  java.net.ConnectException: Call From marta-komputer/127.0.1.1 to localhost:9000 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:62)
      at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
      at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)
      at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:731)
      at org.apache.hadoop.ipc.Client.call(Client.java:1472)
      at org.apache.hadoop.ipc.Client.call(Client.java:1399)
      at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)
      at com.sun.proxy.$Proxy9.delete(Unknown Source)
      at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.delete(ClientNamenodeProtocolTranslatorPB.java:521)
      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:483)
      at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
      at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
      at com.sun.proxy.$Proxy10.delete(Unknown Source)
      at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:1929)
      at org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:638)
      at org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:634)
      at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
      at org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:634)
      at org.apache.hadoop.examples.Grep.run(Grep.java:95)
      at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
      at org.apache.hadoop.examples.Grep.main(Grep.java:101)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:483)
      at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
      at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
      at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
      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:483)
      at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
  Caused by: java.net.ConnectException: Connection refused
      at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
      at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
      at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
      at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:530)
      at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:494)
      at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:607)
      at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:705)
      at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:368)
      at org.apache.hadoop.ipc.Client.getConnection(Client.java:1521)
      at org.apache.hadoop.ipc.Client.call(Client.java:1438)
      ... 32 more
  </code></pre>
  
  <hr>
  
  <p><strong>etc/hadoop/hadoop-env.sh</strong> file:</p>
  
  <pre><code># The java implementation to use.
  export JAVA_HOME=/usr/lib/jvm/java-8-oracle
  
  # The jsvc implementation to use. Jsvc is required to run secure datanodes
  # that bind to privileged ports to provide authentication of data transfer
  # protocol.  Jsvc is not required if SASL is configured for authentication of
  # data transfer protocol using non-privileged ports.
  #export JSVC_HOME=${JSVC_HOME}
  
  export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-"/etc/hadoop"}
  
  # Extra Java CLASSPATH elements.  Automatically insert capacity-scheduler.
  for f in $HADOOP_HOME/contrib/capacity-scheduler/*.jar; do
    if [ "$HADOOP_CLASSPATH" ]; then
      export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f
    else
      export HADOOP_CLASSPATH=$f
    fi
  done
  
  # The maximum amount of heap to use, in MB. Default is 1000.
  #export HADOOP_HEAPSIZE=
  #export HADOOP_NAMENODE_INIT_HEAPSIZE=""
  
  # Extra Java runtime options.  Empty by default.
  export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"
  
  # Command specific options appended to HADOOP_OPTS when specified
  export HADOOP_NAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
  export HADOOP_DATANODE_OPTS="-Dhadoop.security.logger=ERROR,RFAS $HADOOP_DATANODE_OPTS"
  
  export HADOOP_SECONDARYNAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_SECONDARYNAMENODE_OPTS"
  
  export HADOOP_NFS3_OPTS="$HADOOP_NFS3_OPTS"
  export HADOOP_PORTMAP_OPTS="-Xmx512m $HADOOP_PORTMAP_OPTS"
  
  # The following applies to multiple commands (fs, dfs, fsck, distcp etc)
  export HADOOP_CLIENT_OPTS="-Xmx512m $HADOOP_CLIENT_OPTS"
  #HADOOP_JAVA_PLATFORM_OPTS="-XX:-UsePerfData $HADOOP_JAVA_PLATFORM_OPTS"
  
  # On secure datanodes, user to run the datanode as after dropping privileges.
  # This **MUST** be uncommented to enable secure HDFS if using privileged ports
  # to provide authentication of data transfer protocol.  This **MUST NOT** be
  # defined if SASL is configured for authentication of data transfer protocol
  # using non-privileged ports.
  export HADOOP_SECURE_DN_USER=${HADOOP_SECURE_DN_USER}
  
  # Where log files are stored.  $HADOOP_HOME/logs by default.
  #export HADOOP_LOG_DIR=${HADOOP_LOG_DIR}/$USER
  
  # Where log files are stored in the secure data environment.
  export HADOOP_SECURE_DN_LOG_DIR=${HADOOP_LOG_DIR}/${HADOOP_HDFS_USER}
  
  # HDFS Mover specific parameters
  ###
  # Specify the JVM options to be used when starting the HDFS Mover.
  # These options will be appended to the options specified as HADOOP_OPTS
  # and therefore may override any similar flags set in HADOOP_OPTS
  #
  # export HADOOP_MOVER_OPTS=""
  
  ###
  # Advanced Users Only!
  ###
  
  # The directory where pid files are stored. /tmp by default.
  # NOTE: this should be set to a directory that can only be written to by 
  #       the user that will run the hadoop daemons.  Otherwise there is the
  #       potential for a symlink attack.
  export HADOOP_PID_DIR=${HADOOP_PID_DIR}
  export HADOOP_SECURE_DN_PID_DIR=${HADOOP_PID_DIR}
  
  # A string representing this instance of hadoop. $USER by default.
  export HADOOP_IDENT_STRING=$USER
  </code></pre>
  
  <p><strong>.bashrc</strong> file Hadoop-related fragment:</p>
  
  <pre><code># -- HADOOP ENVIRONMENT VARIABLES START -- #
  export JAVA_HOME=/usr/lib/jvm/java-8-oracle
  export HADOOP_HOME=/usr/local/hadoop
  export PATH=$PATH:$HADOOP_HOME/bin
  export PATH=$PATH:$HADOOP_HOME/sbin
  export HADOOP_MAPRED_HOME=$HADOOP_HOME
  export HADOOP_COMMON_HOME=$HADOOP_HOME
  export HADOOP_HDFS_HOME=$HADOOP_HOME
  export YARN_HOME=$HADOOP_HOME
  export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
  export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"
  # -- HADOOP ENVIRONMENT VARIABLES END -- #
  </code></pre>
  
  <p><strong>/usr/local/hadoop/etc/hadoop/core-site.xml</strong> file:</p>
  
  <pre><code>&lt;configuration&gt;
  
  &lt;property&gt;
    &lt;name&gt;hadoop.tmp.dir&lt;/name&gt;
    &lt;value&gt;/usr/local/hadoop_tmp&lt;/value&gt;
    &lt;description&gt;A base for other temporary directories.&lt;/description&gt;
  &lt;/property&gt;
  
  &lt;property&gt;
  &lt;name&gt;fs.default.name&lt;/name&gt;
  &lt;value&gt;hdfs://localhost:9000&lt;/value&gt;
  &lt;/property&gt;
  
  &lt;/configuration&gt;
  </code></pre>
  
  <p><strong>/usr/local/hadoop/etc/hadoop/hdfs-site.xml</strong> file:</p>
  
  <pre><code>&lt;configuration&gt;
  &lt;property&gt;
        &lt;name&gt;dfs.replication&lt;/name&gt;
        &lt;value&gt;1&lt;/value&gt;
   &lt;/property&gt;
   &lt;property&gt;
        &lt;name&gt;dfs.namenode.name.dir&lt;/name&gt;
        &lt;value&gt;file:/usr/local/hadoop_tmp/hdfs/namenode&lt;/value&gt;
   &lt;/property&gt;
   &lt;property&gt;
        &lt;name&gt;dfs.datanode.data.dir&lt;/name&gt;
        &lt;value&gt;file:/usr/local/hadoop_tmp/hdfs/datanode&lt;/value&gt;
   &lt;/property&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p><strong>/usr/local/hadoop/etc/hadoop/yarn-site.xml</strong> file:</p>
  
  <pre><code>&lt;configuration&gt; 
  &lt;property&gt;
        &lt;name&gt;yarn.nodemanager.aux-services&lt;/name&gt;
        &lt;value&gt;mapreduce_shuffle&lt;/value&gt;
  &lt;/property&gt;
  &lt;property&gt;
        &lt;name&gt;yarn.nodemanager.aux-services.mapreduce.shuffle.class&lt;/name&gt;
        &lt;value&gt;org.apache.hadoop.mapred.ShuffleHandler&lt;/value&gt;
  &lt;/property&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p><strong>/usr/local/hadoop/etc/hadoop/mapred-site.xml</strong> file:</p>
  
  <pre><code>&lt;configuration&gt;
  &lt;property&gt;
        &lt;name&gt;mapreduce.framework.name&lt;/name&gt;
        &lt;value&gt;yarn&lt;/value&gt;
  &lt;/property&gt;
  &lt;configuration&gt;
  </code></pre>
  
  <p>Running <code>hduser@marta-komputer:/usr/local/hadoop$ bin/hdfs namenode -format</code> results in an output as follows (I substitiute some of its part with <code>(...)</code>): </p>
  
  <pre><code>hduser@marta-komputer:/usr/local/hadoop$ bin/hdfs namenode -format
  15/02/22 18:50:47 INFO namenode.NameNode: STARTUP_MSG: 
  /************************************************************
  STARTUP_MSG: Starting NameNode
  STARTUP_MSG:   host = marta-komputer/127.0.1.1
  STARTUP_MSG:   args = [-format]
  STARTUP_MSG:   version = 2.6.0
  STARTUP_MSG:   classpath = /usr/local/hadoop/etc/hadoop:/usr/local/hadoop/share/hadoop/common/lib/htrace-core-3.0.4.jar:/usr/local/hadoop/share/hadoop/common/lib/commons-cli (...)2.6.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.6.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.6.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.6.0.jar:/usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.6.0.jar:/usr/local/hadoop/contrib/capacity-scheduler/*.jar
  STARTUP_MSG:   build = https://git-wip-us.apache.org/repos/asf/hadoop.git -r e3496499ecb8d220fba99dc5ed4c99c8f9e33bb1; compiled by 'jenkins' on 2014-11-13T21:10Z
  STARTUP_MSG:   java = 1.8.0_31
  ************************************************************/
  15/02/22 18:50:47 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
  15/02/22 18:50:47 INFO namenode.NameNode: createNameNode [-format]
  15/02/22 18:50:47 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  Formatting using clusterid: CID-0b65621a-eab3-47a4-bfd0-62b5596a940c
  15/02/22 18:50:48 INFO namenode.FSNamesystem: No KeyProvider found.
  15/02/22 18:50:48 INFO namenode.FSNamesystem: fsLock is fair:true
  15/02/22 18:50:48 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
  15/02/22 18:50:48 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: The block deletion will start around 2015 Feb 22 18:50:48
  15/02/22 18:50:48 INFO util.GSet: Computing capacity for map BlocksMap
  15/02/22 18:50:48 INFO util.GSet: VM type       = 64-bit
  15/02/22 18:50:48 INFO util.GSet: 2.0% max memory 889 MB = 17.8 MB
  15/02/22 18:50:48 INFO util.GSet: capacity      = 2^21 = 2097152 entries
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: defaultReplication         = 1
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: maxReplication             = 512
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: minReplication             = 1
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: maxReplicationStreams      = 2
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: shouldCheckForEnoughRacks  = false
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: encryptDataTransfer        = false
  15/02/22 18:50:48 INFO blockmanagement.BlockManager: maxNumBlocksToLog          = 1000
  15/02/22 18:50:48 INFO namenode.FSNamesystem: fsOwner             = hduser (auth:SIMPLE)
  15/02/22 18:50:48 INFO namenode.FSNamesystem: supergroup          = supergroup
  15/02/22 18:50:48 INFO namenode.FSNamesystem: isPermissionEnabled = true
  15/02/22 18:50:48 INFO namenode.FSNamesystem: HA Enabled: false
  15/02/22 18:50:48 INFO namenode.FSNamesystem: Append Enabled: true
  15/02/22 18:50:48 INFO util.GSet: Computing capacity for map INodeMap
  15/02/22 18:50:48 INFO util.GSet: VM type       = 64-bit
  15/02/22 18:50:48 INFO util.GSet: 1.0% max memory 889 MB = 8.9 MB
  15/02/22 18:50:48 INFO util.GSet: capacity      = 2^20 = 1048576 entries
  15/02/22 18:50:48 INFO namenode.NameNode: Caching file names occuring more than 10 times
  15/02/22 18:50:48 INFO util.GSet: Computing capacity for map cachedBlocks
  15/02/22 18:50:48 INFO util.GSet: VM type       = 64-bit
  15/02/22 18:50:48 INFO util.GSet: 0.25% max memory 889 MB = 2.2 MB
  15/02/22 18:50:48 INFO util.GSet: capacity      = 2^18 = 262144 entries
  15/02/22 18:50:48 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
  15/02/22 18:50:48 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
  15/02/22 18:50:48 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension     = 30000
  15/02/22 18:50:48 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
  15/02/22 18:50:48 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
  15/02/22 18:50:48 INFO util.GSet: Computing capacity for map NameNodeRetryCache
  15/02/22 18:50:48 INFO util.GSet: VM type       = 64-bit
  15/02/22 18:50:48 INFO util.GSet: 0.029999999329447746% max memory 889 MB = 273.1 KB
  15/02/22 18:50:48 INFO util.GSet: capacity      = 2^15 = 32768 entries
  15/02/22 18:50:48 INFO namenode.NNConf: ACLs enabled? false
  15/02/22 18:50:48 INFO namenode.NNConf: XAttrs enabled? true
  15/02/22 18:50:48 INFO namenode.NNConf: Maximum size of an xattr: 16384
  Re-format filesystem in Storage Directory /usr/local/hadoop_tmp/hdfs/namenode ? (Y or N) Y
  15/02/22 18:50:50 INFO namenode.FSImage: Allocated new BlockPoolId: BP-948369552-127.0.1.1-1424627450316
  15/02/22 18:50:50 INFO common.Storage: Storage directory /usr/local/hadoop_tmp/hdfs/namenode has been successfully formatted.
  15/02/22 18:50:50 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid &gt;= 0
  15/02/22 18:50:50 INFO util.ExitUtil: Exiting with status 0
  15/02/22 18:50:50 INFO namenode.NameNode: SHUTDOWN_MSG: 
  /************************************************************
  SHUTDOWN_MSG: Shutting down NameNode at marta-komputer/127.0.1.1
  ************************************************************/
  </code></pre>
  
  <p>Starting <code>dfs</code> and <code>yarn</code> results in the following output:</p>
  
  <pre><code>hduser@marta-komputer:/usr/local/hadoop$ start-dfs.sh
  15/02/22 18:53:05 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  Starting namenodes on [localhost]
  localhost: starting namenode, logging to /usr/local/hadoop/logs/hadoop-hduser-namenode-marta-komputer.out
  localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-hduser-datanode-marta-komputer.out
  Starting secondary namenodes [0.0.0.0]
  0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-hduser-secondarynamenode-marta-komputer.out
  15/02/22 18:53:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  hduser@marta-komputer:/usr/local/hadoop$ start-yarn.sh
  starting yarn daemons
  starting resourcemanager, logging to /usr/local/hadoop/logs/yarn-hduser-resourcemanager-marta-komputer.out
  localhost: starting nodemanager, logging to /usr/local/hadoop/logs/yarn-hduser-nodemanager-marta-komputer.out
  </code></pre>
  
  <p>Calling <code>jps</code> shortly after that gives:</p>
  
  <pre><code>hduser@marta-komputer:/usr/local/hadoop$ jps
  11696 ResourceManager
  11842 NodeManager
  11171 NameNode
  11523 SecondaryNameNode
  12167 Jps
  </code></pre>
  
  <p><strong>netstat</strong> output:</p>
  
  <pre><code>hduser@marta-komputer:/usr/local/hadoop$ sudo netstat -lpten | grep java
  tcp        0      0 0.0.0.0:8088            0.0.0.0:*               LISTEN      1001       690283      11696/java      
  tcp        0      0 0.0.0.0:42745           0.0.0.0:*               LISTEN      1001       684574      11842/java      
  tcp        0      0 0.0.0.0:13562           0.0.0.0:*               LISTEN      1001       680955      11842/java      
  tcp        0      0 0.0.0.0:8030            0.0.0.0:*               LISTEN      1001       684531      11696/java      
  tcp        0      0 0.0.0.0:8031            0.0.0.0:*               LISTEN      1001       684524      11696/java      
  tcp        0      0 0.0.0.0:8032            0.0.0.0:*               LISTEN      1001       680879      11696/java      
  tcp        0      0 0.0.0.0:8033            0.0.0.0:*               LISTEN      1001       687392      11696/java      
  tcp        0      0 0.0.0.0:8040            0.0.0.0:*               LISTEN      1001       680951      11842/java      
  tcp        0      0 127.0.0.1:9000          0.0.0.0:*               LISTEN      1001       687242      11171/java      
  tcp        0      0 0.0.0.0:8042            0.0.0.0:*               LISTEN      1001       680956      11842/java      
  tcp        0      0 0.0.0.0:50090           0.0.0.0:*               LISTEN      1001       690252      11523/java      
  tcp        0      0 0.0.0.0:50070           0.0.0.0:*               LISTEN      1001       687239      11171/java  
  </code></pre>
  
  <p><strong>/etc/hosts</strong> file:</p>
  
  <pre><code>127.0.0.1       localhost
  127.0.1.1       marta-komputer
  
  # 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
  </code></pre>
  
  <h1>====================================================</h1>
  
  <p><strong>UPDATE 1.</strong></p>
  
  <p>I updated the <em>core-site.xml</em> and now I have:</p>
  
  <pre><code>&lt;property&gt;
  &lt;name&gt;fs.default.name&lt;/name&gt;
  &lt;value&gt;hdfs://marta-komputer:9000&lt;/value&gt;
  &lt;/property&gt;
  </code></pre>
  
  <p>but I keep receiving the error - now starting as:</p>
  
  <pre><code>15/03/01 00:59:34 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
  java.net.ConnectException: Call From marta-komputer.home/192.168.1.8 to marta-komputer:9000 failed on connection exception:     java.net.ConnectException: Connection refused; For more details see:    http://wiki.apache.org/hadoop/ConnectionRefused
  </code></pre>
  
  <p>I also notice that <code>telnet localhost 9000</code> is not working:</p>
  
  <pre><code>hduser@marta-komputer:~$ telnet localhost 9000
  Trying 127.0.0.1...
  telnet: Unable to connect to remote host: Connection refused
  </code></pre>