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https://issues.apache.org/jira/browse/BOOKKEEPER-890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15138467#comment-15138467
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ASF GitHub Bot commented on BOOKKEEPER-890:
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Github user sijie commented on the pull request:
https://github.com/apache/bookkeeper/pull/9#issuecomment-181742688
the change looks good to me. +1
> Concurrent modification exception when removing listener in Bookkeeper ZK
> ledger manager
> ----------------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-890
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-890
> Project: Bookkeeper
> Issue Type: Bug
> Affects Versions: 4.3.2
> Reporter: Matteo Merli
> Assignee: Matteo Merli
> Priority: Minor
> Fix For: 4.4.0
>
>
> The listener set is modified while iterating through it.
> {noformat}
> 00:20:00.283 [main-EventThread] INFO o.a.b.meta.AbstractZkLedgerManager -
> Unregistered ledger metadata listener ReadOnlyLedgerHandle(lid = 10454, id =
> 839729832) on ledger 10454.
> 00:20:00.283 [main-EventThread] ERROR org.apache.zookeeper.ClientCnxn -
> Error while calling watcher
> java.util.ConcurrentModificationException: null
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
> ~[na:1.8.0_60]
> at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
> ~[na:1.8.0_60]
> at
> org.apache.bookkeeper.meta.AbstractZkLedgerManager.process(AbstractZkLedgerManager.java:207)
> ~[bookkeeper-server-4.3.1.36.jar:4.3.1]
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
> [zookeeper-3.4.6.jar:3.4.6-1569965]
> at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> [zookeeper-3.4.6.jar:3.4.6-1569965]
> {noformat}
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