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https://issues.apache.org/jira/browse/SOLR-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040256#comment-17040256
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Andrzej Bialecki commented on SOLR-599:
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ZK dependencies can be avoided by using already existing HTTP-based
implementations of these APIs: {{ClusterStateProvider}}, {{NodeStateProvider}}
and not yet implemented (but relatively easy to do) {{DistribStateManager}}.
All these APIs were specifically created to isolate some areas of Solr from ZK.
{{CloudSolrClient}} can use these APIs to avoid using ZK APIs during runtime.
The way {{CloudSolrClient}} is implemented now it still does have a
compile-time ZK dependency but we could start from {{CloudSolrClient}} and
simplify it to only use the {{ClusterStateProvider}} API and its HTP
implementation.
> Lightweight SolrJ client
> ------------------------
>
> Key: SOLR-599
> URL: https://issues.apache.org/jira/browse/SOLR-599
> Project: Solr
> Issue Type: Improvement
> Components: clients - java, SolrJ
> Reporter: Shalin Shekhar Mangar
> Priority: Minor
> Fix For: 4.9, 6.0
>
> Attachments: SOLR-599-fix-for-SolrJ-on-GAE.patch, SOLR-599.patch,
> SOLR-599.patch
>
>
> SolrJ provides a SolrServer implementation backed by commons-httpclient which
> introduces many dependency jars (commons-codec, commons-io and
> commons-logging). Apart from that SolrJ also uses StAX API for XML parsing
> which introduces dependencies like stax-api, stax and stax-utils.
> This enhancement will add a SolrServer implementation backed by
> java.net.HttpUrlConnection and will use BinaryResponseParser as the default
> response parser. Using this basic implementation out of the box would require
> no dependencies on either commons-httpclient or StAX. The only dependency
> would be on solr-commons making this a very lightweight and distribution
> friendly Java client for Solr.
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