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https://issues.apache.org/jira/browse/RATIS-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123891#comment-16123891
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Tsz Wo Nicholas Sze commented on RATIS-103:
-------------------------------------------

All tests passed after the patch.

> 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
>         Attachments: r103_20170811.patch
>
>
> 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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