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https://issues.apache.org/jira/browse/HADOOP-11684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14875712#comment-14875712
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Thomas Demoor commented on HADOOP-11684:
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As said previously, I agree with your points above. I propose to use 
CallerRunsPolicy (I'll add a patch) and we can always move to the current patch 
later if the threaded writers would come up.



> S3a to use thread pool that blocks clients
> ------------------------------------------
>
>                 Key: HADOOP-11684
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11684
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.7.0
>            Reporter: Thomas Demoor
>            Assignee: Thomas Demoor
>         Attachments: HADOOP-11684-001.patch, HADOOP-11684-002.patch
>
>
> Currently, if fs.s3a.max.total.tasks are queued and another (part)upload 
> wants to start, a RejectedExecutionException is thrown. 
> We should use a threadpool that blocks clients, nicely throtthling them, 
> rather than throwing an exception. F.i. something similar to 
> https://github.com/apache/incubator-s4/blob/master/subprojects/s4-comm/src/main/java/org/apache/s4/comm/staging/BlockingThreadPoolExecutorService.java



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