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https://issues.apache.org/jira/browse/RATIS-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123869#comment-16123869
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Tsz Wo Nicholas Sze commented on RATIS-103:
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It seems that we could simply use ArrayList instead of CopyOnWriteArrayList.
Will check it with the unit tests.
> LeaderState.updateSenders may throws UnsupportedOperationException
> ------------------------------------------------------------------
>
> Key: RATIS-103
> URL: https://issues.apache.org/jira/browse/RATIS-103
> Project: Ratis
> Issue Type: Bug
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Minor
>
> The CopyOnWriteArrayList may not work well in LeaderState since it does not
> support remove.
> RaftReconfigurationBaseTest.testRemovePeers() fails with
> UnsupportedOperationException.
> {code}
> Exception in thread "Thread-102" java.lang.UnsupportedOperationException
> at
> java.util.concurrent.CopyOnWriteArrayList$COWIterator.remove(CopyOnWriteArrayList.java:1176)
> at
> org.apache.ratis.server.impl.LeaderState.updateSenders(LeaderState.java:254)
> ...
> {code}
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