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https://issues.apache.org/jira/browse/SOLR-12297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464567#comment-16464567
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Mark Miller commented on SOLR-12297:
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bq. Our clients don't support talking to HTTP2 so I'm not sure how that would
actually work unless it was single server Solr with no internal communication.
Ah, you actually could get this to work with our clients, they just wouldn't
use HTTP2. I didn't know that you can serve HTTP1.1 and HTTP2 on the same port.
You have to use ALPN though and that is kind of a mess before Java 9. Good to
know though, that is a much nicer option for our transition to support HTTP2
than running two connectors on two ports.
> Create a good SolrClient for SolrCloud paving the way for async requests,
> HTTP2, multiplexing, and the latest & greatest Jetty features.
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-12297
> URL: https://issues.apache.org/jira/browse/SOLR-12297
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Priority: Major
>
> Blocking or async support as well as HTTP2 compatible with multiplexing.
> Once it supports enough and is stable, replace internal usage, allowing
> async, and eventually move to HTTP2 connector and allow multiplexing. Could
> support HTTP1.1 and HTTP2 on different ports depending on state of the world
> then.
> The goal of the client itself is to work against HTTP1.1 or HTTP2 with
> minimal or no code path differences and the same for async requests (should
> initially work for both 1.1 and 2 and share majority of code).
> The client should also be able to replace HttpSolrClient and plug into the
> other clients the same way.
> I doubt it would make sense to keep ConcurrentUpdateSolrClient eventually
> though.
> I evaluated some clients and while there are a few options, I went with
> Jetty's HttpClient. It's more mature than Apache HttpClient's support (in 5
> beta) and we would have to update to a new API for Apache HttpClient anyway.
> Meanwhile, the Jetty guys have been very supportive of helping Solr with any
> issues and I like having the client and server from the same project.
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