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From "Shengsheng Huang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6456) Export Utility throws ClassNotFoundException
Date Thu, 26 Jul 2012 05:41:33 GMT
Shengsheng Huang created HBASE-6456:
---------------------------------------

             Summary: Export Utility throws ClassNotFoundException
                 Key: HBASE-6456
                 URL: https://issues.apache.org/jira/browse/HBASE-6456
             Project: HBase
          Issue Type: Bug
            Reporter: Shengsheng Huang
            Priority: Minor


The command I ran is as below:
"bin/hbase org.apache.hadoop.hbase.mapreduce.Driver export t1 ./t1"

And I got the following exceptions:

attempt_201207261322_0002_m_000000_0, Status : FAILED
Error: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.util.Bytes
        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)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:150)
        at org.apache.hadoop.hbase.mapreduce.TableInputFormat.setConf(TableInputFormat.java:100)
        at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
        at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:767)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
        at org.apache.hadoop.mapred.Child$4.run(Child.java:266)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.au
...

This exception can be resolved by adding hbase common jar into HADOOP_CLASSPATH. But this
is an extra step for users and not so convenient. 

We could add Bytes.class into dependency Jars of the MapReduce job.  



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