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https://issues.apache.org/jira/browse/SOLR-6832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337800#comment-14337800
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Ayon Sinha commented on SOLR-6832:
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@Otis, you are correct. This helps only where there is over-sharding. And in
our particular scenario where we sharded to get better CPU core utilization and
write speeds based on Tim's experiments with over-sharding. Since all queries
were send to other nodes, we were getting hit with distributed deadlocks more
often when one or more nodes were slow/overloaded.
So this patch is a slight optimization and a reduction of likelihood of getting
bogged down by other slow nodes when the parent query node has the core.
> Queries be served locally rather than being forwarded to another replica
> ------------------------------------------------------------------------
>
> Key: SOLR-6832
> URL: https://issues.apache.org/jira/browse/SOLR-6832
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10.2
> Reporter: Sachin Goyal
> Assignee: Timothy Potter
> Fix For: Trunk, 5.1
>
> Attachments: SOLR-6832.patch, SOLR-6832.patch, SOLR-6832.patch,
> SOLR-6832.patch
>
>
> Currently, I see that code flow for a query in SolrCloud is as follows:
> For distributed query:
> SolrCore -> SearchHandler.handleRequestBody() -> HttpShardHandler.submit()
> For non-distributed query:
> SolrCore -> SearchHandler.handleRequestBody() -> QueryComponent.process()
> \\
> \\
> \\
> For a distributed query, the request is always sent to all the shards even if
> the originating SolrCore (handling the original distributed query) is a
> replica of one of the shards.
> If the original Solr-Core can check itself before sending http requests for
> any shard, we can probably save some network hopping and gain some
> performance.
> \\
> \\
> We can change SearchHandler.handleRequestBody() or HttpShardHandler.submit()
> to fix this behavior (most likely the former and not the latter).
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