[CURATOR-44] LeaderSelector does not assign leader randomly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.1-incubating
• Fix Version/s: 2.2.0-incubating
• Component/s: Documentation, Recipes
• Assignee: Jay Zarfoss
• Reporter: Anders Wallgren
• Created: 26/Jun/13 23:50
• Updated: 19/Jul/13 23:09
• Resolved: 19/Jul/13 23:09

Description

The javadoc for LeaderSelector says leadership is assigned randomly but this does not appear to be the case.

A fair mutex is used so it appears that leaders are selected in the order that they attempt to acquire the mutex.

This probably wouldn't be much more than a documentation issue except that it tends to concentrate leaders on one node in the cluster when each node participates in more than one election (and assuming the node starts the LeaderSelectors right around the time the node comes up, which is the case in our usage).