[jira] [Commented] (HBASE-6456) Export Utility throws ClassNotFoundException

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-6456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427452#comment-13427452 ] 

Lars Hofhansl commented on HBASE-6456:
--------------------------------------

Do you see the same problem when you run export like this:
{code}
hbase org.apache.hadoop.hbase.mapreduce.Export ...
{code}
?
                
> Export Utility throws ClassNotFoundException
> --------------------------------------------
>
>                 Key: HBASE-6456
>                 URL: https://issues.apache.org/jira/browse/HBASE-6456
>             Project: HBase
>          Issue Type: Bug
>          Components: mapred, mapreduce, util
>    Affects Versions: 0.96.0, 0.94.2
>            Reporter: Shengsheng Huang
>            Assignee: Shengsheng Huang
>            Priority: Minor
>         Attachments: HBASE-6456.patch
>
>
> 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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