[HBASE-13706] CoprocessorClassLoader should not exempt Hive classes

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0.1, 1.1.0, 0.98.12, 2.0.0
• Fix Version/s: 0.98.14, 1.2.0, 1.3.0, 2.0.0
• Component/s: Coprocessors
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Starting from HBase 2.0, CoprocessorClassLoader will not exempt hadoop classes or zookeeper classes. This means that if the custom coprocessor jar contains hadoop or zookeeper packages and classes, they will be loaded by the CoprocessorClassLoader. Only hbase packages and classes are exempted from the CoprocessorClassLoader. They (and their dependencies) are loaded by the parent server class loader.

• Assignee: Jerry He
• Reporter: Jerry He
• Created: 18/May/15 17:21
• Updated: 24/Jun/22 18:51
• Resolved: 13/Aug/15 18:40

Description

CoprocessorClassLoader is used to load classes from the coprocessor jar.
Certain classes are exempt from being loaded by this ClassLoader, which means they will be ignored in the coprocessor jar, but loaded from parent classpath instead.

One problem is that we categorically exempt "org.apache.hadoop".
But it happens that Hive packages start with "org.apache.hadoop".

There is no reason to exclude hive classes from theCoprocessorClassLoader.
HBase does not even include Hive jars.

Issue Links

• relates to: YARN-5070 upgrade HBase version for first merge
• relates to: HBASE-15686 Add override mechanism for the exempt classes when dynamically loading table coprocessor