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https://issues.apache.org/jira/browse/HADOOP-13227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317646#comment-15317646
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Tsz Wo Nicholas Sze commented on HADOOP-13227:
----------------------------------------------

> Can we use ConcurrentLinkedQueue's iterator for the scanning here? We will 
> not get any ConcurrentModificationException ...

Honestly, I didn't know that it won't throw ConcurrentModificationException in 
this case.  I learned something here.  Thanks a lot!  Here is a new patch.

c13227_20160607.patch

> AsyncCallHandler should use a event driven architecture to handle async calls
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-13227
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13227
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io, ipc
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: c13227_20160602.patch, c13227_20160606.patch, 
> c13227_20160607.patch
>
>
> This JIRA is to address [Jing's 
> comments|https://issues.apache.org/jira/browse/HADOOP-13226?focusedCommentId=15308630&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15308630]
>  in HADOOP-13226.



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