Custom SolrServer chains - mixing SolrServer-subclass properties as you like to
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Key: SOLR-3384
URL: https://issues.apache.org/jira/browse/SOLR-3384
Project: Solr
Issue Type: Improvement
Components: clients - java
Affects Versions: 3.5
Reporter: Per Steffensen
Priority: Minor
Fix For: 4.0
Today it is like this
- LBHttpSolrServer is load-balancing over HttpSolrServers
- ConcurrentUpdateSolrServer is using HttpSolrServer internally for sending
requests (or its not, but I believe (without having looked thoroughly into it)
it ought to)
- CloudSolrServer is using LBHttpSolrServer to load-balance over HttpSolrServer
(one for each slice in a collection)
IMHO it is a little to hardcoded to release its full potential. Those
SolrServers (or some of them) ought to take the "internally used SolrServer(s)"
or a factory to help creating those as a parameter (constructor and/or
set-method). E.g.
- LBHttpSolrServer should just be called LBSolrServer and not be hardcoded to
use HttpSolrServers internally. Instead of taking a list of URLs to
load-balance over (using HttpSolrSever) it should just take a list of
SolrServers to load-balance over.
- ConcurrentUpdateSolrServer should not be hardcoded to use HttpSolrServer
internally. Instead take SolrServers (or a factory to construct those) to use
internally as input from the outside.
- CloudSolrServer of course will need to load-balance over the slices in the
collection (that is its core property), but not necessarily directly using
HttpSolrServers. Instead it should probably take a factory accepting a URL in
its "createInstance"-method to be used when creating the SolrServers to
load-balance over.
Making SolrServer more generic like this, having them deal only with their core
reason for existing (separation of concerns), you will be able to create you
own custom chains of SolrServers - e.g. a "LBSolrSever -> CloudSolrSevers ->
LBSolrServer -> ConcurrentSolrServers -> HttpSolrServer" chain which I believe
I would like to use to load-balance asynchronously over several collections.
This improvement is very hard to do before SOLR-3382 and SOLR-3383 has been
solved, because you will not be able to add Concurrent(Update)SolrServer to
your chain without limiting the functionality of your chain (update only) and
you will not be able to get responses back.
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