[HBASE-6456] Export Utility throws ClassNotFoundException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Cannot Reproduce
• Affects Version/s: 0.95.2
• Component/s: mapreduce, util
• Assignee: Unassigned
• Reporter: Shane Huang
• Created: 26/Jul/12 05:40
• Updated: 13/Jun/22 18:54
• Resolved: 11/Apr/15 00:21

Description

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.