[jira] [Assigned] (CASSANDRA-11116) Gossiper#isEnabled is not thread safe

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-11116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ariel Weisberg reassigned CASSANDRA-11116:
------------------------------------------

    Assignee: Ariel Weisberg

> Gossiper#isEnabled is not thread safe
> -------------------------------------
>
>                 Key: CASSANDRA-11116
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11116
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sergio Bossa
>            Assignee: Ariel Weisberg
>            Priority: Critical
>
> {{Gossiper#isEnabled()}} relies on the presence of {{scheduledGossipTask}}, which is not final nor volatile. As a consequence, when such method is called on a different thread, i.e. the gossip stage thread, it is sometimes detected as not enabled, causing particularly obscure failures.
> This is shown by the following logs. First the gossiper is started:
> {noformat}
> 1 TRACE [Thread-29] 2016-02-03 19:21:31,232  Gossiper.java (line 1310) gossip started with generation 1454527291
> {noformat}
> Then the same node misses a gossip message because the gossiper is seen as disabled:
> {noformat}
> 1 TRACE [GossipStage:1] 2016-02-03 19:21:32,016  GossipDigestSynVerbHandler.java (line 44) Ignoring GossipDigestSynMessage because gossip is disabled
> {noformat}



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