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From "Timothy Potter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-6832) Queries be served locally rather than being forwarded to another replica
Date Tue, 03 Feb 2015 21:28:35 GMT

    [ https://issues.apache.org/jira/browse/SOLR-6832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304033#comment-14304033
] 

Timothy Potter commented on SOLR-6832:
--------------------------------------

Awesome - btw ... in case you haven't seen this before, it's a little cumbersome to get at
the ZkController from the req object, something like:

{code}
req.getCore().getCoreDescriptor().getCoreContainer().getZkController().getBaseUrl()
{code}

> 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
>         Attachments: 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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