How to run HBase

Question

How can I run the code from the command line?

import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.*; import org.apache.hadoop.hbase.client.*; import org.apache.hadoop.hbase.util.*; public class MyHBase { public static void main(String[] args) throws Exception { Configuration conf = HBaseConfiguration.create(); HBaseAdmin admin = new HBaseAdmin(conf); try { HTable table = new HTable(conf, "test-table"); Put put = new Put(Bytes.toBytes("test-key")); put.add(Bytes.toBytes("cf"), Bytes.toBytes("q"), Bytes.toBytes("value")); table.put(put); } finally { admin.close(); } } } 

How to set the path to hbase classes? I get a huge string in my classpath.

UPDATE

 root# vi MyHBase.java hbase-0.92.2 root# java -classpath `hbase classpath`:./ /var/root/MyHBase -sh: hbase: command not found Exception in thread "main" java.lang.NoClassDefFoundError: /var/root/MyHBase Caused by: java.lang.ClassNotFoundException: .var.root.MyHBase 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) 

I can do

 hbase-0.92.2 root# bin/hbase shell HBase Shell; enter 'help<RETURN>' for list of supported commands. Type "exit<RETURN>" to leave the HBase Shell Version 0.92.2, r1379292, Fri Aug 31 13:13:53 UTC 2012 hbase(main):001:0> exit 

Am I doing something wrong?

Answer 1

You can also do something like this: -

 # export HADOOP_CLASSPATH=`./hbase classpath` 

and then group this java into a jar to run it in a cluster from under this type: -

 #hadoop jar <jarfile> <mainclass> 

Answer 2

Use this

 java -classpath `hbase classpath`:./ MyHBase 

this will get the whole class chain that HBase uses, and add the current directory to the class path.

Rags Cheers