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Add API for configuring minimum connections for HTTP/2 connection pool #2155

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Fixes #1808

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I understand a decent bit, and it looks good to me. Have a question about the doc though.

@@ -80,6 +80,10 @@
* <li>{@link PoolMetrics#idleSize()} always returns {@code 0}.</li>
* </ul>
* <p>
* If minimum connections is specified, the cached connections with active streams will be kept at that minimum
* (can be the best effort). However, if the cached connections have reached max concurrent streams,
* then new connections will be allocated up to the maximum connections limit.
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Hmm, so the code now will do this, right:
For any new HTTP/2 request, if the number of socket connections is below the minimum number of connections, a new socket connection will get created and the HTTP/2 stream will get created on that new socket connection, right?

I don't really get that from the javadoc, but that may just be me.

What does the best effort part mean? I think I'm missing that part in the code and want to make sure I'm not misunderstanding something?

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Hmm, so the code now will do this, right: For any new HTTP/2 request, if the number of socket connections is below the minimum number of connections, a new socket connection will get created and the HTTP/2 stream will get created on that new socket connection, right?

yes

I don't really get that from the javadoc, but that may just be me.

What does the best effort part mean? I think I'm missing that part in the code and want to make sure I'm not misunderstanding something?

As we do not have a strong synchronisation between when we return the connection and we acquire the connection we may not be able to stay exactly on the min number that is specified.

@violetagg violetagg modified the milestones: 1.0.19, 1.0.20 May 3, 2022
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I need to think about the proper place for this configuration. Most probably on the level of ConnectionProvider as we can have connection pools per remote host.

@samueldlightfoot
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samueldlightfoot commented May 16, 2022

Thanks for this - we are very keen to consume this feature to aid our balancing too!

@violetagg violetagg added the status/superseded An issue that has been superseded by another label Jun 6, 2022
@violetagg violetagg removed this from the 1.0.20 milestone Jun 6, 2022
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This is superseded by #2257

A new API Http2AllocationStrategy is exposed so that minimum connections and maximum concurrent streams can be configured.

@violetagg violetagg closed this Jun 6, 2022
@violetagg violetagg deleted the issue-1808 branch June 9, 2022 08:47
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HTTP2 - Round-robining streams across a minimum setting of connections
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