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https://issues.apache.org/jira/browse/SOLR-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17041054#comment-17041054
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Noble Paul commented on SOLR-599:
---------------------------------

Optimistic caching works for `state.json` .

The requests send the zk versions of the cached state.json files along with the 
requests. if the versions are wrong the nodes respond with an invalid cache 
message. The client then fetches fresh state and makes the request again

> 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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