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https://issues.apache.org/jira/browse/BOOKKEEPER-747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13992734#comment-13992734
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Rakesh R commented on BOOKKEEPER-747:
-------------------------------------
bq.What can go wrong if we don't synchronize listenerSet in AbstractZK?
Say in worst case it can occur 'java.util.ConcurrentModificationException'
Thread1: AbstractZK#unregisterLedgerMetadataListener -> removes the listener
from listenerSet
Thread2: AbstractZK#operationComplete -> iterating over the listenerSet, here
this will throw ConcurrentModificationException.
> Implement register/unregister LedgerMetadataListener in MSLedgerManagerFactory
> ------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-747
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-747
> Project: Bookkeeper
> Issue Type: Improvement
> Affects Versions: 4.3.0, 4.2.3
> Reporter: Flavio Junqueira
> Assignee: Flavio Junqueira
> Fix For: 4.3.0, 4.2.3
>
> Attachments: BOOKKEEPER-747-4.2.patch, BOOKKEEPER-747-4.2.patch,
> BOOKKEEPER-747-4.2.patch, BOOKKEEPER-747.patch, BOOKKEEPER-747.patch,
> BOOKKEEPER-747.patch, BOOKKEEPER-747.patch, BOOKKEEPER-747.patch
>
>
> Check TODOs in MSLedgerManagerFactory.
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