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Posted to dev@lucene.apache.org by "Shawn Heisey (JIRA)" <ji...@apache.org> on 2018/06/04 13:21:00 UTC
[jira] [Commented] (SOLR-11982) Add support for indicating
preferred replica types for queries
[ https://issues.apache.org/jira/browse/SOLR-11982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500203#comment-16500203 ]
Shawn Heisey commented on SOLR-11982:
-------------------------------------
I've got a question about this, sorry I didn't think of it while the issue was open.
If a preference is configured for TLOG replicas, what happens if a TLOG replica is elected leader? I would think that most people would NOT want requests to go to that replica, because its operation while leader is the same as NRT.
> Add support for indicating preferred replica types for queries
> --------------------------------------------------------------
>
> Key: SOLR-11982
> URL: https://issues.apache.org/jira/browse/SOLR-11982
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 7.4, master (8.0)
> Reporter: Ere Maijala
> Assignee: Tomás Fernández Löbbe
> Priority: Minor
> Labels: patch-available, patch-with-test
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-11982-preferReplicaTypes.patch, SOLR-11982-preferReplicaTypes.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch, SOLR-11982.patch
>
>
> It would be nice to have the possibility to easily sort the shards in the preferred order e.g. by replica type. The attached patch adds support for {{shards.sort}} parameter that allows one to sort e.g. PULL and TLOG replicas first with \{{shards.sort=replicaType:PULL|TLOG }}(which would mean that NRT replicas wouldn't be hit with queries unless they're the only ones available) and/or to sort by replica location (like preferLocalShards=true but more versatile).
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