[ZOOKEEPER-1405] leader election recipe sample code - dispatchEvent invocations can get out of order

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.4.3
• Component/s: recipes
• Assignee: Unassigned
• Reporter: Robert Varga
• Created: 05/Mar/12 13:42
• Updated: 06/Mar/12 12:10

Description

Since the process method is not synchronized in org.apache.zookeeper.recipes.election.LeaderElectionSupport, therefore there is a race condition where events coming in from the watch may overtake the events dispatched during the start method.

A solution to ensure that events dispatched during the start method are handled before any watch-based events is to make the process method synchronized.