[
https://issues.apache.org/jira/browse/CURATOR-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713256#comment-13713256
]
Jay Zarfoss commented on CURATOR-44:
------------------------------------
I'm thinking it may be best to simply update the Javadoc for LeaderSelector and
then consider some new Leader-election paradigm.
In order for leadership to really be random for a given group of nodes, we'd
need to randomly re-evaluate the leadership every time a node entered the
group. Otherwise in the pathological case where node A always starts two
minutes before node B, node A will always be the leader for everything (which
is probably what you're experiencing). So for leadership to be random in
this case that means that node A would need to get voted off the island, which
to me implies something like a "loseLeadership()" method in the callback, which
probably would warrant a new Leadership paradigm like
"VulnerableLeaderSelector".
Thoughts?
> LeaderSelector does not assign leader randomly
> ----------------------------------------------
>
> Key: CURATOR-44
> URL: https://issues.apache.org/jira/browse/CURATOR-44
> Project: Apache Curator
> Issue Type: Bug
> Components: Recipes
> Affects Versions: 2.0.1-incubating
> Reporter: Anders Wallgren
>
> 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).
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
