CODEWITHSUNDEEP
javaapachehadoophdfs
user4637855
user4637855

Reputation:

Error: Could not find or load main class org.apache.hadoop.hdfs.server.datanode.DataNode

I am new to apache hadoop. I am installing the multi-node cluster but I am getting two errors. I am not aware about what kind of errors these are and why they have generated.I have googled alot about the errors but I was not able to find out the reason behind the error generation.

  Error:Could not find or load main class org.apache.hadoop.util.PlatformName

  Error: Could not find or load main class org.apache.hadoop.hdfs.server.datanode.DataNode

Both the errors are generated due to the datanode or slaves. I need to know about the kind of errors, the reason for generation,and how to resolve them. Thank you.

Upvotes: 1

Views: 9707

Answers (2)

sandipchandanshive
sandipchandanshive

Reputation: 145

Change folder which stores: hbase.zookeeper.property.dataDir

For example:

sudo mkdir hb
chown hduser:hadoop /home/hduser/hb

And in hbase-site.xml change this property

<property>
<name>hbase.zookeeper.property.dataDir</name>
<value>/home/hduser/hb/zookeeper</value>
</property>

Upvotes: 2

Rajesh N
Rajesh N

Reputation: 2574

Error:Could not find or load main class org.apache.hadoop.util.PlatformName

Error: Could not find or load main class org.apache.hadoop.hdfs.server.datanode.DataNode

These errors occur if Hadoop cannot find hadoop-core-1.2.1.jar file in its classpath.

To rectify this error, you need to add this file in Hadoop classpath.

1. Copy hadoop-core-1.2.1.jar to $HADOOP_HOME/lib folder

2. Add the following line in hadoop-env.sh:

export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HADOOP_HOME/lib/hadoop-core-1.2.1.jar

NOTE: $HADOOP_HOME should point to hadoop installation folder.

OPTIONAL: If you want to avoid other "Could not find or load main class" error in future, just do this instead of step 2.

export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HADOOP_HOME/lib/*.jar

Upvotes: 2

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