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https://issues.apache.org/jira/browse/HADOOP-11684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15470440#comment-15470440
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Steve Loughran commented on HADOOP-11684:
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Playing with this and large files, i'm starting to think we should actually
have defaults of lower fs.s3a.threads.max and a longer queue. Why? it's too
easy with 10 threads to OOM a big distcp from outside an AWS DC.
> 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
> Fix For: 3.0.0-alpha1
>
> Attachments: HADOOP-11684-001.patch, HADOOP-11684-002.patch,
> HADOOP-11684-003.patch, HADOOP-11684-004.patch, HADOOP-11684-005.patch,
> HADOOP-11684-006.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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