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https://issues.apache.org/jira/browse/ROCKETMQ-145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931110#comment-15931110
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ASF subversion and git services commented on ROCKETMQ-145:
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Commit 0b39fcadfa2950f1dd3975e1262ccd544f350750 in incubator-rocketmq's branch
refs/heads/develop from [~Yukon]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-rocketmq.git;h=0b39fca ]
[ROCKETMQ-145][HOTFIX] Resolve concureent issue in HAService and
GroupCommitService
> Hit ConcurrentModificationException in doWaitTransfer which happens very offen
> ------------------------------------------------------------------------------
>
> Key: ROCKETMQ-145
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-145
> Project: Apache RocketMQ
> Issue Type: Bug
> Components: rocketmq-store
> Affects Versions: 4.0.0-incubating
> Reporter: Eason Chen
> Assignee: yukon
>
> we use master and slave , sync transfer and asyn flush, happens this very
> offen:
> 2017-03-17 20:12:38 WARN GroupTransferService - GroupTransferService service
> has exception.
> java.util.ConcurrentModificationException: null
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> ~[na:1.8.0_121]
> at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[na:1.8.0_121]
> at
> org.apache.rocketmq.store.ha.HAService$GroupTransferService.doWaitTransfer(HAService.java:277)
> ~[rocketmq-store-4.0.0-incubating.jar:4.0.0-incubating]
> at
> org.apache.rocketmq.store.ha.HAService$GroupTransferService.run(HAService.java:301)
> ~[rocketmq-store-4.0.0-incubating.jar:4.0.0-incubating]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
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