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HDFS >> mail # user >> Re: High Availability - second namenode (master2) issue: Incompatible namespaceIDs


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Re: High Availability - second namenode (master2) issue: Incompatible namespaceIDs
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
>
>
>
>
>
>
>
+
shashwat shriparv 2012-11-16, 07:52
+
shashwat shriparv 2012-11-16, 07:53