Sergio Bossa created CASSANDRA-11116:
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Summary: 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
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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