[HBASE-11749] Better error logging when coprocessors loading has failed.

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 0.99.0, 0.98.6
• Component/s: Coprocessors, Usability
• Hadoop Flags: Reviewed
• Assignee: Srikanth Srungarapu
• Reporter: Srikanth Srungarapu
• Created: 14/Aug/14 22:20
• Updated: 06/Apr/18 17:51
• Resolved: 15/Aug/14 00:50

Description

The following is the error in the log files, when the wrong coprocessor is specified in config file.

378:2014-08-14 15:15:41,773 ERROR [master:172.16.2.118:60000] coprocessor.CoprocessorHost: The coprocessor org.apache.hadoop.hbase.security.visibility.VisibilityControlle threw an unexpected exception

Instead it would be better to have more meaningful exception description like

525:2014-08-14 15:07:33,682 ERROR [master:172.16.2.118:60000] coprocessor.CoprocessorHost: The coprocessor org.apache.hadoop.hbase.security.visibility.VisibilityControlle threw java.lang.ClassNotFoundException: org.apache.hadoop.hbase.security.visibility.VisibilityControlle