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I config Hadoop in windows 7 from tutorial It setting up a Single Node Cluster. When run hdfs namenode -format to format namenode it throw exception like: And when start-all.cmd the windows namenode auto forced then I can open namenode GUI in address – http://localhost:50070.
16/01/19 15:18:58 WARN namenode.FSEditLog: No class configured for C, dfs.namenode.edits.journal-plugin.C is empty
16/01/19 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) 16/01/19 15:18:58 INFO util.ExitUtil: Exiting with status 1 16/01/19 15:18:58 INFO namenode.NameNode: SHUTDOWN_MSG: /************************************************************
Core-site.xml
<configuration> <property> <name>fs.defaultFS</name> <value>hdfs://localhost:9000</value> </property> </configuration> 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> mapred-site.xml
<configuration> <property> <name>mapreduce.framework.name</name> <value>yarn</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> </configuration> 
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If NameNode fails, the entire Hadoop cluster will fail. Actually, there will be no data loss, only the cluster job will be shut down because NameNode is just the point of contact for all DataNodes and if the NameNode fails then all communication will stop.
By following methods we can restart the NameNode: You can stop the NameNode individually using /sbin/hadoop-daemon.sh stop namenode command. Then start the NameNode using /sbin/hadoop-daemon.sh start namenode. Use /sbin/stop-all.sh and the use /sbin/start-all.sh, command which will stop all the demons first.
When a NameNode starts up, it merges the fsimage and edits journal to provide an up-to-date view of the file system metadata. The NameNode then overwrites fsimage with the new HDFS state and begins a new edits journal. The Checkpoint node periodically creates checkpoints of the namespace.
Change your following properties from:
<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> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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