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 > > > > > > >
