I installed Hadoop 2.9.0. I checked jps in slave nodes, are running datanode and nodemanager in slaves and namenode and resourcemanager in master. Please help that Why is this error? According to presented solutions, I disabled firewall, SELinux and IPv6. Problem is that Live nodes in web UI is 0.
/etc/hosts:
1 localhost
127.0.1.1 hadoopmaster
#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
192.168.111.154 hadoopmaster
192.168.111... hadoopslave1
192.168.111... hadoopslave2
192.168.111... hadoopslave3
Configuration in all of the nodes:
core-site.xml:
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://hadoopmaster:9000</value>
</property>
</configuration>
yarn-site.xml:
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
<value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>hadoopmaster:8025</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>hadoopmaster:8030</value>
</property>
<property>
<name>yarn.resourcemanager.address</name>
<value>hadoopmaster:8050</value>
</property>
</configuration>
Output of netstat -nap | grep 9000:
tcp 0 0 127.0.1.1:9000 0.0.0.0:* LISTEN 18205/java
tcp 0 0 127.0.0.1:59048 127.0.1.1:9000 TIME_WAIT -
I restarted hadoop and formatted namenode again and agin But still I get this error: (hadoop-hadoop-datanode-hadoopslave1.log)
2018-06-11 02:42:33,593 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: hadoopmaster/192.168.111.154:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
I got the solution. edit /etc/hosts