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From Tomás Fernández Löbbe (JIRA) <>
Subject [jira] [Updated] (SOLR-10880) Support replica filtering by tag
Date Thu, 10 Aug 2017 17:17:00 GMT


Tomás Fernández Löbbe updated SOLR-10880:
    Priority: Major  (was: Minor)

> Support replica filtering by tag
> --------------------------------
>                 Key: SOLR-10880
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Domenico Fabio Marino
>         Attachments: SOLR-10880.patch, SOLR-10880.patch, SOLR-10880.patch, SOLR-10880.patch
> Add a mechanism to allow queries to use only a subset of replicas(by specifying the wanted
replica tag).
> Some replicas have to be marked as tag before running the query.
> A query has to specify ShardParams.REPLICA_TAG_NAME to specify what property holds the
tag it wants to use (for example "replica.tag") and then use ShardParams.REPLICA_TAG_LIKE
"tagName" to tell the ShardHandler to only use the replicas matching tagName.
> A query can also use ShardParams.REPLICA_TAG_DISLIKE "tagName" to use all the replicas
that do not match tagName.
> In order to properly use this system, replicas need to be tagged, tagging a replica involves
setting the property ShardParams.REPLICA_TAG_NAME to a property name and then set that property
in the replicas.
> An example can be seen in the ReplicaTagTest included in this patch where a dynamic cloud
has some tags assigned to it both randomly and on a fixed basis.
> A replica can have multiple tags attached to it, and these tags are separated by default
by "|"(pipe character), the delimiter can be changed by setting ShardParams.REPLICA_TAG_DELIMITER
in the query to anything else.
> No validity check is performed on the tags, therefore one may get an array of shard URLs
that contains empty URLs, or that is null(when the property does not exist), the user of this
feature has to deal with it.
> The tag to replica mappings are rebuilt for each query that specifies ShardParams.REPLICA_TAG_NAME.

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