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https://issues.apache.org/jira/browse/HADOOP-13637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094592#comment-16094592
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Yonger commented on HADOOP-13637:
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[~steve_l] I don't think we should create a connection pool bigger than a work
thread pool.
Assume the application run on Hadoop kick of request with X rate, each request
cost T1 time on thread and T1 time on connection, obviously, T1 will bigger
than T2 due to a request always get response to release a connection and then
release a thread later . That means XT1>XT2, and according little's law,
N1(threads are needed concurrently) >N2 (connections are needed concurrently).
So the result is opposite of yours, we should set minimum thread pool size base
on max connection + n.
> 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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