[jira] [Created] (ROCKETMQ-145) Hit ConcurrentModificationException in doWaitTransfer which happens very offen

[Eason Chen (JIRA)]

Eason Chen created ROCKETMQ-145:
-----------------------------------

             Summary: 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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