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https://issues.apache.org/jira/browse/SOLR-13257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917249#comment-16917249
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ASF subversion and git services commented on SOLR-13257:
--------------------------------------------------------
Commit 0c9ec35f88fc07aa6ecb0fef2deea705aaee39c2 in lucene-solr's branch
refs/heads/master from Anshum Gupta
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=0c9ec35 ]
SOLR-13257: Cleanup code and make the AffinityReplicaTransformer constructors
private (#848)
SOLR-13257: Cleanup code and make the constructors private as the constructor
is supposed to be called via the static getInstance method.
> Enable replica routing affinity for better cache usage
> ------------------------------------------------------
>
> Key: SOLR-13257
> URL: https://issues.apache.org/jira/browse/SOLR-13257
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: Michael Gibney
> Assignee: Anshum Gupta
> Priority: Minor
> Fix For: master (9.0), 8.3
>
> Attachments: AffinityShardHandlerFactory.java, SOLR-13257.patch,
> SOLR-13257.patch
>
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> For each shard in a distributed request, Solr currently routes each request
> randomly via
> [ShufflingReplicaListTransformer|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/component/ShufflingReplicaListTransformer.java]
> to a particular replica. In setups with replication factor >1, this normally
> results in a situation where subsequent requests (which one would hope/expect
> to leverage cached results from previous related requests) end up getting
> routed to a replica that hasn't seen any related requests.
> The problem can be replicated by issuing a relatively expensive query (maybe
> containing common terms?). The first request initializes the
> {{queryResultCache}} on the consulted replicas. If replication factor >1 and
> there are a sufficient number of shards, subsequent requests will likely be
> routed to at least one replica that _hasn't_ seen the query before. The
> replicas with uninitialized caches become a bottleneck, and from the client's
> perspective, many subsequent requests appear not to benefit from caching at
> all.
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