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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704595#comment-13704595
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Yonik Seeley commented on SOLR-5017:
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bq. > Perhaps that should be a different router... compositeField rather than
compositeId.
bq. Too many routers can be confusing to users.
Heh - my favorite argument. "confusing to users" can be trotted out in any
context ;-)
Too many options can be just as confusing... 3 routers with 5 options each vs 5
routers with 3 or whatever. Let's talk about the *best* option. If we have a
good default and good documentation, confusion shouldn't enter the equation.
As far as compositeId router goes, I'm not sure I care if we create a new
compositeField router or if we add more parameters / functionality to
compositeId. Giving the exact same \_shard\_ parameter should give the exact
same hash code though - it shouldn't just be the first part of a composite id.
> Allow sharding based on the value of a field
> --------------------------------------------
>
> Key: SOLR-5017
> URL: https://issues.apache.org/jira/browse/SOLR-5017
> Project: Solr
> Issue Type: Sub-task
> Reporter: Noble Paul
> Assignee: Noble Paul
>
> We should be able to create a collection where sharding is done based on the
> value of a given field
> collections can be created with shardField=fieldName, which will be persisted
> in DocCollection in ZK
> implicit DocRouter would look at this field instead of _shard_ field
> CompositeIdDocRouter can also use this field instead of looking at the id
> field.
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