[ROCKETMQ-145] Hit ConcurrentModificationException in doWaitTransfer which happens very offen

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0-incubating
• Fix Version/s: 4.1.0-incubating
• Component/s: rocketmq-store
• Assignee: Xinyu Zhou
• Reporter: Eason Chen
• Created: 17/Mar/17 13:05
• Updated: 13/Jun/17 09:17
• Resolved: 13/Jun/17 09:17

Description

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]