[HIVE-574] Hive should use ClassLoader from hadoop Configuration

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3.0
• Fix Version/s: 0.4.0
• Assignee: Zheng Shao
• Reporter: Zheng Shao
• Created: 24/Jun/09 04:15
• Updated: 17/Dec/11 00:07
• Resolved: 30/Jun/09 18:09

Description

See HIVE-338.
Hive should always use the getClassByName method from hadoop Configuration, so that we choose the correct ClassLoader. Examples include all plug-in interfaces, including UDF/GenericUDF/UDAF, SerDe, and FileFormats. Basically the following code snippet shows the idea:

package org.apache.hadoop.conf;
public class Configuration implements Iterable<Map.Entry<String,String>> {
   ...
  /**
   * Load a class by name.
   * 
   * @param name the class name.
   * @return the class object.
   * @throws ClassNotFoundException if the class is not found.
   */
  public Class<?> getClassByName(String name) throws ClassNotFoundException {
    return Class.forName(name, true, classLoader);
  }

Issue Links

• blocks: HIVE-584 Clean up global and ThreadLocal variables in Hive
• is blocked by: HIVE-338 Executing cli commands into thrift server