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


Per Steffensen commented on SOLR-3383:

We are working on a solution that we hope to contribute soon.
> Async responses in SolrJ
> ------------------------
>                 Key: SOLR-3383
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: clients - java
>    Affects Versions: 3.5
>            Reporter: Per Steffensen
>            Assignee: Per Steffensen
>              Labels: async, asynchronous, concurrency, query, solrj, update
>             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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