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https://issues.apache.org/jira/browse/SOLR-6096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015235#comment-14015235
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Thomas Scheffler commented on SOLR-6096:
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I would prefer a solrconfig.xml that all updates should be handled as block
updates. Currently I don't get it why that's not the default. Are there
performance issues that come with this? It would even help be to turn on block
updates on client side via SOLRJ. But as I saw in the code, block updates
depend on nested documents. There are no nested documents on delete and may not
be on updates. So this heuristic to guess if it is a block update is definitely
no good enough.
> Support Update and Delete on nested documents
> ---------------------------------------------
>
> Key: SOLR-6096
> URL: https://issues.apache.org/jira/browse/SOLR-6096
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.7.2
> Reporter: Thomas Scheffler
> Labels: blockjoin, nested
>
> When using nested or child document. Update and delete operation on the root
> document should also affect the nested documents, as no child can exist
> without its parent :-)
> Example
> {code:xml|title=First Import}
> <doc>
> <field name="id">1</field>
> <field name="title">Article with author</field>
> <doc>
> <field name="name">Smith, John</field>
> <field name="role">author</field>
> </doc>
> </doc>
> {code}
> If I change my mind and the author was not named *John* but *_Jane_*:
> {code:xml|title=Changed name of author of '1'}
> <doc>
> <field name="id">1</field>
> <field name="title">Article with author</field>
> <doc>
> <field name="name">Smith, Jane</field>
> <field name="role">author</field>
> </doc>
> </doc>
> {code}
> I would expect that John is not in the index anymore. Currently he is. There
> might also be the case that any subdocument is removed by an update:
> {code:xml|title=Remove author}
> <doc>
> <field name="id">1</field>
> <field name="title">Article without author</field>
> </doc>
> {code}
> This should affect a delete on all nested documents, too. The same way all
> nested documents should be deleted if I delete the root document:
> {code:xml|title=Deletion of '1'}
> <delete>
> <id>1</id>
> <!-- implying also
> <query>_root_:1</query>
> -->
> </delete>
> {code}
> This is currently possible to do all this stuff on client side by issuing
> additional request to delete document before every update. It would be more
> efficient if this could be handled on SOLR side. One would benefit on atomic
> update. The biggest plus shows when using "delete-by-query".
> {code:xml|title=Deletion of '1' by query}
> <delete>
> <query>title:*</query>
> <!-- implying also
> <query>_root_:1</query>
> -->
> </delete>
> {code}
> In that case one would not have to first query all documents and issue
> deletes by those id and every document that are nested.
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