[HIVE-4574] XMLEncoder thread safety issues in openjdk7 causes HiveServer2 to be stuck

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.11.0, 0.12.0
• Component/s: HiveServer2
• Assignee: Thejas Nair
• Reporter: Thejas Nair
• Created: 17/May/13 16:56
• Updated: 11/Dec/13 23:46
• Resolved: 06/Nov/13 19:41

Description

In open jdk7, XMLEncoder.writeObject call leads to calls to java.beans.MethodFinder.findMethod(). MethodFinder class not thread safe because it uses a static WeakHashMap that would get used from multiple threads. See -
http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/com/sun/beans/finder/MethodFinder.java#46

Concurrent access to HashMap implementation that are not thread safe can sometimes result in infinite-loops and other problems. If jdk7 is in use, it makes sense to synchronize calls to XMLEncoder.writeObject .

Issue Links

• relates to: HIVE-5411 Migrate expression serialization to Kryo