I have set up a multi-node Hadoop Cluster. The NameNode and Secondary namenode runs on the same machine and the cluster has only one Datanode. All the nodes are configured on Amazon EC2 machines.
Following are the configuration files on the master node:
masters
54.68.218.192 (public IP of the master node)
slaves
54.68.169.62 (public IP of the slave node)
core-site.xml
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>
mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/datanode</value>
</property>
</configuration>
Now are the configuration files on the datanode:
core-site.xml
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://54.68.218.192:10001</value>
</property>
</configuration>
mapred-site.xml
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>54.68.218.192:10002</value>
</property>
</configuration>
hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/datanode</value>
</property>
</configuration>
the jps run on the Namenode give the following:
5696 NameNode
6504 Jps
5905 SecondaryNameNode
6040 ResourceManager
and jps on datanode:
2883 DataNode
3496 Jps
3381 NodeManager
which to me seems right.
Now when I try to run a put command:
hadoop fs -put count_inputfile /test/input/
It gives me the following error:
put: File /count_inputfile._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.
The logs on the datanode says the following:
hadoop-datanode log
INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 54.68.218.192/54.68.218.192:10001. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
yarn-nodemanager log:
INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
The web UI of node manager(50070) shows that there are 0 live nodes and 0 dead nodes and the dfs used is 100%
I have also disabled IPV6.
On a few websites, I found out that I should also edit the /etc/hosts file. I have also edited them and they look like this:
127.0.0.1 localhost
172.31.25.151 ip-172-31-25-151.us-west-2.compute.internal
172.31.25.152 ip-172-31-25-152.us-west-2.compute.internal
Why I am still getting the error?
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