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https://issues.apache.org/jira/browse/HADOOP-13637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109456#comment-16109456
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Steve Loughran commented on HADOOP-13637:
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Try setting a small connection size, large thread pool and then do some work:
see what happens
> improve setting of max connections in AWS client
> ------------------------------------------------
>
> Key: HADOOP-13637
> URL: https://issues.apache.org/jira/browse/HADOOP-13637
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Priority: Minor
>
> things can go badly wrong if the S3A FS creates a thread pool for IO > than
> the number of pooled AWS http connections (set by property
> MAXIMUM_CONNECTIONS); you also need some for any other IO requests coming in.
> The max connections property is currently independent of thread pool size,
> and has a default value of 1.
> this is why there is a troubleshooting section in the docs showing the stack
> trace and instructions to fix".
> Better: have a dynamic minimum like thread pool size + n, for a value of n to
> be chosen.
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