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06-23-2016
01:18 PM
you are right,the firewall is running
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06-23-2016
07:37 AM
I installed a three node hadoop cluster. The master and slave node starts separately but the datanode isn't shown in namenode webUI. The log file for datanode shows the following error : 2016-06-18 21:23:53,980 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.1.100:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-06-18 21:23:55,029 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.1.100:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-06-18 21:23:56,030 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.1.100:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-06-18 21:23:57,031 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.1.100:9000. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-06-18 21:23:58,032 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.1.100:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS) namenode machine's infomation: cat /etc/hosts #127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.100 namenode
192.168.1.101 datanode1
192.168.1.102 datanode2 cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0
IPV6INIT=yes
BOOTPROTO=dhcp
UUID=61fe61d3-fcda-4fed-ba81-bfa767e0270a
ONBOOT=yes
TYPE=Ethernet
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME="System eth0"
BOOTPROTO="static"
ONBOOT="yes"
IPADDR=192.168.1.100
GATEWAY=192.168.1.1
NETMASK=255.255.255.0
DNS1=192.168.1.1 cat /etc/hostname namenode cat core-site.xml <configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/hadoop/tmp</value>
<description>Abase for other temporary directories.</description>
</property>
<property>
<name>fs.defaultFS</name>
<value>hdfs://namenode:9000</value>
</property>
<property>
<name>io.file.buffer.size</name>
<value>4096</value>
</property> cat hdfs-site.xml <configuration>
<property>
<name>dfs.nameservices</name>
<value>hadoop-cluster1</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>namenode:50090</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:///home/hadoop/dfs/name</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:///home/hadoop/dfs/data</value>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property> cat mapred-site.xml <configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobtracker.http.address</name>
<value>namenode:50030</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>namenode:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>namenode:19888</value>
</property> cat yarn-site.xml <configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.address</name>
<value>namenode:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>namenode:8030</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>namenode:8031</value>
</property>
<property>
<name>yarn.resourcemanager.admin.address</name>
<value>namenode:8033</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>namenode:8088</value>
</property>
cat slaves datanode1
datanode2
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