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https://issues.apache.org/jira/browse/SOLR-7247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366391#comment-14366391
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Yonik Seeley commented on SOLR-7247:
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bq. Do you mean to say that , it is impossible or very difficult to make
routing on an alternate field?
It's possible to make it work, but it makes a lot of things more complex (and
slower from the user perspective if you have to broadcast realtime-get,
deletes, atomic updates, etc). And what's the gain really? It appears to come
down to aesthetics or something?
> sliceHash for compositeIdRouter is not coherent with routing
> ------------------------------------------------------------
>
> Key: SOLR-7247
> URL: https://issues.apache.org/jira/browse/SOLR-7247
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.10.3
> Reporter: Paolo Cappuccini
> Assignee: Noble Paul
>
> in CompositeIdRouter the function sliceHash check routeField configured for
> collection.
> This make me to guess that intended behaviour is manage alternative field to
> id field to hash documents.
> But the signature of this method is very general ( can take id, doc or
> params) and it is used in different ways from different functionality.
> In my opinion it should have overloads instead of a weak internal logic. One
> overload with "doc" and "collection" and another one with "id" , "params" and
> "collections".
> In any case , if "\_route_" is not available by "params" , "collection"
> should be mandatory and in case of RouteField, also "doc" should be mandatory.
> This will break SplitIndex but it will save coherence of data.
> If i configure routeField i noticed that is broken the DeleteCommand (this
> pass to sliceHash only "id" and "params" ) and SolrIndexSplitter ( this pass
> only "id" )
> It should be forbidden to specify RouteField to compositeIdRouter or
> implements related functionality to make possible to hash documents based on
> RouteField.
> in case of DeleteCommand command the workaround is to specify "_route_" param
> in request but in case of Index Splitting is not possible any workaround.
> In this case it should be passed entire document during splitting ("doc"
> parameter") or build params with proper "\_route_" parameter.
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