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https://issues.apache.org/jira/browse/ARTEMIS-2368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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clebert suconic closed ARTEMIS-2368.
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Fix Version/s: 2.10.0
Resolution: Fixed
> Fix races on closing consumer
> -----------------------------
>
> Key: ARTEMIS-2368
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2368
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 2.9.0
> Reporter: yangwei
> Priority: Major
> Fix For: 2.10.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> There are some race conditions between closing consumer and session failover:
> # When sending SessionConsumerCloseMessage timeout, conn::fail() is called
> resulting in current consumer is recreated on server side again but removed
> on client side.
> # Between SessionConsumerCloseMessage sending and session::removeConsume(),
> session failover happens resulting in consumer inconsistency.
> # When an iteration over the consumers entrySet is made to recreate consumer
> during session failover process, consumer::close() is called, maybe leading
> to consumer inconsistency or ConcurrentModificationException thrown.
> We traverse through the cloned consumers entrySet, add synchronized block and
> check if consumer is closed while recreating consumer to fix the issue.
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