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https://issues.apache.org/jira/browse/HADOOP-11684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14724435#comment-14724435
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Aaron Fabbri commented on HADOOP-11684:
---------------------------------------

[~Thomas Demoor] reading your patch.. Curious, did you consider just using 
[http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ThreadPoolExecutor.CallerRunsPolicy.html|CallerRunsPolicy]?
  

> 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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