Failed to start namenode in hadoop

Question

When I run hdfs namenode -format to format namenode, I am getting this following error:

11/01/19 15:18:58 WARN namenode.FSEditLog: No class configured for C, dfs.namenode.edits.journal-plugin.C is empty
11/01/19 15:18:58 ERROR namenode.NameNode: Failed to start namenode. java.lang.IllegalArgumentException: No class configured for C at org.apache.hadoop.hdfs.server.namenode.FSEditLog.getJournalClass(FSEditLog.java:1615) at org.apache.hadoop.hdfs.server.namenode.FSEditLog.createJournal(FSEditLog.java:1629) at org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournals(FSEditLog.java:282) at org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournalsForWrite(FSEditLog.java:247) at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:985) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1429) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1554) 11/01/19 15:18:58 INFO util.ExitUtil: Exiting with status 1 11/01/19 15:18:58 INFO namenode.NameNode: SHUTDOWN_MSG: /************************************************************

hdfs-site.xml

<configuration>
   <property>
       <name>dfs.replication</name>
       <value>1</value>
   </property>
   <property>
       <name>dfs.namenode.name.dir</name>
       <value>C:/hadoop/data/namenode</value>
   </property>
   <property>
       <name>dfs.datanode.data.dir</name>
       <value>C:/hadoop/data/datanode</value>
   </property>
</configuration>

Comments

Hi,

I tried the same but i am still facing this issue. I am using hadoop 3.2.1 version.

Can ypu please help me out with this.

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Can you share your hdfs-site.xml file?

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Hey, @Harshita,

Did you try the solutions suggested below?

Answer 1

Change your following properties in hdfs-site.xml

<property>
   <name>dfs.namenode.name.dir</name>
   <value>C:/hadoop/data/namenode</value>
</property>
<property>
   <name>dfs.datanode.data.dir</name>
   <value>C:/hadoop/data/datanode</value>
</property>

to

<property>
   <name>dfs.namenode.name.dir</name>
   <value>/hadoop/data/namenode</value>
</property>
<property>
   <name>dfs.datanode.data.dir</name>
   <value>/hadoop/data/datanode</value>
</property>

Comments

Superb...after investing 2 days for this bullshit. I got answer here.... Thanks Omkar from bottom of my heart. Really appreciate you !!! do you write blog on hadoop, if yes, please send me an email 1 to one sohanmudgal1983@gmail.com

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2019-10-09 21:26:48,556 WARN namenode.FSEditLog: No class configured for C, dfs.namenode.edits.journal-plugin.C is empty
2019-10-09 21:26:48,559 ERROR namenode.NameNode: Failed to start namenode.
java.lang.IllegalArgumentException: No class configured for C
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.getJournalClass(FSEditLog.java:1792)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.createJournal(FSEditLog.java:1808)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournals(FSEditLog.java:296)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournalsForWrite(FSEditLog.java:261)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1185)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1649)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1759)
2019-10-09 21:26:48,559 INFO util.ExitUtil: Exiting with status 1: java.lang.IllegalArgumentException: No class configured for C
2019-10-09 21:26:48,559 INFO namenode.NameNode: SHUTDOWN_MSG:

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Can you share the contents of hdfs-site.xml file?

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Hi Wenzel,

Try to check your configuration, because it should start on 9000 port.

<configuration> 

 <property> 

 <name>fs.defaultFS</name>

 <value>hdfs://localhost:9000</value>

 </property> 

</configuration>

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Thank you! i had the same problem and is now resolved because of this.

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Cheers!

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I too faced the same error, but later after removing C: the error went off. Thanks Omkar