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From "Per Steffensen (Created) (JIRA)" <>
Subject [jira] [Created] (SOLR-3383) Async responses in SolrJ
Date Fri, 20 Apr 2012 09:22:41 GMT
Async responses in SolrJ

                 Key: SOLR-3383
             Project: Solr
          Issue Type: Improvement
          Components: clients - java
    Affects Versions: 3.5
            Reporter: Per Steffensen
            Assignee: Per Steffensen
             Fix For: 4.0

Today it is like this
- SolrServer.request returns NamedList<Object>
- SolrRequest.process returns SolrResponse
- Public methods on SolrServer like addX, optimize, commit, queryX etc. returns subclasses
of SolrResponse (e.g. "add" returns UpdateResponse)
- etc

This is all synchronous - that is, the calling thread of those methods will wait for the response
before being able to continue. I believe the industry today agrees that "operations" like
client-server network-requireing operations should be done asynchronously seens from the client
API. Therefore basically we should change those methods
- SolrServer.request returns Future<NamedList<Object>>
- SolrRequest.process returns Future<SolrResponse>
- returns Future<subclass of SolrResponse>
and make the appropriate changes in the implementations below.

My main argument for this right now, is that ConcurrentUpdateSolrServer really is not able
to hand over responses to the calling client. Guess that it is also the reason why it is only
a "Update"-SolrServer and not a complete SolrServer (being able to do queries etc.) - updates
does not require sending responses (except primitive errors) back to the client, queries etc
does. Now that we do "finegrained error propagation" (SOLR-3382) in order to send "unique
key constraint"- and "versioning"-errors (SOLR-3173 and SOLR-3178) back to the client in responses
to update-request, suddenly it is not true anymore that updates does not require sending responses
back to the client.
Making the changes suggested above (returning Futures) would
- Allow ConcurrentUpdateSolrServer to be used for updates potentially resulting in "unique
key constraint"- and "versioning"-errors
- Allow ConcurrentUpdateSolrServer to become ConcurrentSolrServer - also being able to do
queries etc
- Make Solr more modern with respect to asynchronous principles

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