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https://issues.apache.org/jira/browse/HADOOP-13826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876388#comment-15876388
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Steve Loughran commented on HADOOP-13826:
-----------------------------------------
OK, +1 to this
While I'm tainted by tweaking the test code, I haven't gone near the production
code, and yetus has kicked my changes into shape
> S3A Deadlock in multipart copy due to thread pool limits.
> ---------------------------------------------------------
>
> Key: HADOOP-13826
> URL: https://issues.apache.org/jira/browse/HADOOP-13826
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 2.7.3
> Reporter: Sean Mackrory
> Assignee: Sean Mackrory
> Priority: Critical
> Attachments: HADOOP-13206-branch-2-005.patch, HADOOP-13826.001.patch,
> HADOOP-13826.002.patch, HADOOP-13826.003.patch, HADOOP-13826.004.patch,
> HADOOP-13826-branch-2-006.patch, HADOOP-13826-branch-2-007.patch
>
>
> In testing HIVE-15093 we have encountered deadlocks in the s3a connector. The
> TransferManager javadocs
> (http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/TransferManager.html)
> explain how this is possible:
> {quote}It is not recommended to use a single threaded executor or a thread
> pool with a bounded work queue as control tasks may submit subtasks that
> can't complete until all sub tasks complete. Using an incorrectly configured
> thread pool may cause a deadlock (I.E. the work queue is filled with control
> tasks that can't finish until subtasks complete but subtasks can't execute
> because the queue is filled).{quote}
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