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https://issues.apache.org/jira/browse/SOLR-16503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17821934#comment-17821934
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David Smiley commented on SOLR-16503:
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I don't think there's a performance concern here (positive/negative). It's not
like we're introducing new uses of
{{org.apache.solr.client.solrj.impl.Http2SolrClient#asyncRequest}}; this is
just an HttpClient change.
> Switch UpdateShardHandler.getDefaultHttpClient to Jetty HTTP2
> -------------------------------------------------------------
>
> Key: SOLR-16503
> URL: https://issues.apache.org/jira/browse/SOLR-16503
> Project: Solr
> Issue Type: Sub-task
> Reporter: David Smiley
> Priority: Major
>
> Much of Solr's remaining uses of Apache HttpClient (HTTP 1) is due to
> {{org.apache.solr.update.UpdateShardHandler#getDefaultHttpClient}} which
> underlies most Solr-to-Solr connectivity. This also underlies the
> {{{}CoreContainer.getSolrClientCache{}}}. Lets switch to Jetty (HTTP 2).
> ----
> In SolrClientCache in particular:
> Switch use of CloudLegacySolrClient.Builder to CloudSolrClient.Builder
> Switch use of HttpSolrClient.Builder to Http2SolrClient.Builder
> Undeprecate all the methods here. They should not have been deprecated in
> the first place.
> The constructor: switch from Apache HttpClient to a Jetty HttpClient.
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