[
https://issues.apache.org/jira/browse/ROCKETMQ-195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
wenqi.huang closed ROCKETMQ-195.
--------------------------------
Resolution: Duplicate
> concurrency bug when send data to slave.
> ----------------------------------------
>
> Key: ROCKETMQ-195
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-195
> Project: Apache RocketMQ
> Issue Type: Bug
> Components: rocketmq-store
> Affects Versions: 4.0.0-incubating
> Reporter: wenqi.huang
> Assignee: yukon
> Priority: Critical
> Attachments: bug.png
>
>
> when I test it，I found this error：
> 2017-05-09 18:38:55 ERROR SendMessageThread_4 - do sync transfer other node,
> wait return, but failed, topic: BenchmarkTest tags: null client address:
> 10.24.19.87
> 2017-05-09 18:38:55 WARN SendMessageThread_4 - putMessage not in lock eclipse
> time(ms)=1000, bodyLength=130
> 2017-05-09 18:38:55 WARN GroupTransferService - GroupTransferService service
> has exception.
> java.lang.NullPointerException: null
> at
> org.apache.rocketmq.store.ha.HAService$GroupTransferService.doWaitTransfer(HAService.java:278)
> ~[rocketmq-store-4.1.0-incubating-SNAPSHOT.jar:4.1.0-incubating-SNAPSHOT]
> at
> org.apache.rocketmq.store.ha.HAService$GroupTransferService.run(HAService.java:301)
> ~[rocketmq-store-4.1.0-incubating-SNAPSHOT.jar:4.1.0-incubating-SNAPSHOT]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
> And I watch into this code and found that there is some concurrency bug,
> then I try to fix it. pull request is:
> https://github.com/apache/incubator-rocketmq/pull/102
> as the code shows, the class pointer is volatile does not means ArrayList
> itself is threadsafe, so we need more job to ensure threadsafe.
> (this pull request also fix some other bugs, the concurrency bug may cause
> NullPointerException or ConcurrentModificationException.)
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
