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From "Anders Wallgren (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CURATOR-44) LeaderSelector does not assign leader randomly
Date Wed, 26 Jun 2013 23:52:19 GMT

     [ https://issues.apache.org/jira/browse/CURATOR-44?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anders Wallgren updated CURATOR-44:
-----------------------------------

    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).

  was:
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
tends to start the LeaderSelectors right around the time the node comes up.

    
> 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).

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