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From "Sahil Takiar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13826) S3A Deadlock in multipart copy due to thread pool limits.
Date Tue, 29 Nov 2016 00:28:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15703679#comment-15703679
] 

Sahil Takiar commented on HADOOP-13826:
---------------------------------------

Interesting, did not know that about mutli-part uploads. In that case, we may want to consider
separating the configuration of mutli-part uploads and multi-part copies, right now the S3AFileSystem
sets the same threshold and part size for multi-part copies and uploads, they are both controlled
by fs.s3a.multipart.size and fs.s3a.multipart.threshold

> 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
>         Attachments: HADOOP-13826.001.patch, HADOOP-13826.002.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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