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https://issues.apache.org/jira/browse/HADOOP-13826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-13826:
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Attachment: HADOOP-13206-branch-2-005.patch
Production code LGTM (mostly); test code needed some tweaking, though the core
test algorithm is good
Hence: HADOOP-13286 patch 005
Production code
* thread pool given a name
* imports tweaked
Test code:
* moved test to org.apache.hadoop.fs.s3a.scale.ITestS3AConcurrentOps to
emphasise scale nature & for s3a
* all constant strings -> refs off Constants, to aid finding & avoid typos
* timeout logic integrating with S3AScaleTestBase rules.
* move off assert true/false to asserts with meaningful messages/error
diagnostics
* various other IDE-suggested cleanups of the test code
Tested: S3a ireland @ scale.
Once yetus is happy I'll put this in
> 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
>
>
> 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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