Delete the VERSION for the datanode before format.
∞ Shashwat Shriparv On Fri, Nov 16, 2012 at 1:15 PM, hadoop hive <[email protected]> wrote: > Seems like you havn't format your cluster (if its 1st time made). > > On Fri, Nov 16, 2012 at 9:58 AM, [email protected] <[email protected]> wrote: > >> Hi, >> >> Please help! >> >> I have installed a Hadoop Cluster with a single master (master1) and have >> HBase running on the HDFS. Now I am setting up the second master >> (master2) in order to form HA. When I used JPS to check the cluster, I >> found : >> >> 2782 Jps >> 2126 NameNode >> 2720 SecondaryNameNode >> i.e. The datanode on this server could not be started >> >> In the log file, found: >> 2012-11-16 10:28:44,851 ERROR >> org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: >> Incompatible namespaceIDs in /app/hadoop/tmp/dfs/data: namenode namespaceID >> = 1356148070; datanode namespaceID = 1151604993 >> >> >> >> One of the possible solutions to fix this issue is to: stop the cluster, >> reformat the NameNode, restart the cluster. >> QUESTION: As I already have HBASE running on the cluster, if I reformat >> the NameNode, do I need to reinstall the entire HBASE? I don't mind to have >> all data lost as I don't have many data in HBASE and HDFS, however I don't >> want to re-install HBASE again. >> >> >> On the other hand, I have tried another solution: stop the DataNode, edit >> the namespaceID in current/VERSION (i.e. set namespaceID=1151604993), >> restart the datanode, it doesn't work: >> Warning: $HADOOP_HOME is deprecated. >> starting master2, logging to >> /usr/local/hadoop-1.0.4/libexec/../logs/hadoop-hduser-master2-master2.out >> Exception in thread "main" java.lang.NoClassDefFoundError: master2 >> Caused by: java.lang.ClassNotFoundException: master2 >> at java.net.URLClassLoader$1.run(URLClassLoader.java:202) >> at java.security.AccessController.doPrivileged(Native Method) >> at java.net.URLClassLoader.findClass(URLClassLoader.java:190) >> at java.lang.ClassLoader.loadClass(ClassLoader.java:306) >> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) >> at java.lang.ClassLoader.loadClass(ClassLoader.java:247) >> Could not find the main class: master2. Program will exit. >> QUESTION: Any other solutions? >> >> >> >> Thanks >> >> >> >> >> >> >> >
