[HADOOP-11770] [Umbrella] locate static synchronized blocks in hadoop-common

• Type: Improvement
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 2.7.0
• Component/s: conf, io, ipc
• Assignee: Unassigned
• Reporter: Gopal Vijayaraghavan
• Created: 28/Mar/15 04:06
• Updated: 28/Mar/15 04:06

Description

There are several static synchronized blocks in the hadoop common functionality that hurts any multi-threaded processing system which uses the common APIs.

Identify the static synchronized blocks and locate them for potential fixes.

Sub-Tasks

• Configuration::getClassByNameOrNull synchronizes on a static object: Open
• RPC Invoker relies on static ClientCache which has synchronized(this) blocks: Resolved
• Replace guava Cache with ConcurrentHashMap for caching Connection in ipc Client: Resolved