[SOLR-15213] Add support for "merge" atomic update operation for child documents

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0
• Assignee: David Smiley
• Reporter: James Ashbourne
• Created: 04/Mar/21 14:10
• Updated: 12/May/22 00:26
• Resolved: 25/Dec/21 21:15

Description

Solr has "add", "set", "add-distinct" which work but all have their limitations. Namely, there's currently no way to atomically update a document where that document may or may not be present already by merging if it is present and inserting if it isn't.

i.e. in the scenario where we have a document with two nested children: 
 

{"id": "ocean1", 
"_isParent":"true", 
"fish": [ 
    {
     "id": "fish1", 
     "type_s": "fish", 
     "name_s": "Doe", 
     "_isParent":"false"}, 
    {
     "id": "fish2", 
     "type_s": "fish", 
     "name_s": "Hans", 
     "_isParent":"false"}]
}

 
If we later want to update that child doc e.g.:

{"id": "ocean1", 
"_isParent":"true", 
"fish": [ 
    {
     "id": "fish1", 
     "type_s": "fish", 
     "name_s": "James", // new name
     "_isParent":"false"}, 
]
}

 
Existing operations:

• "add" - will add another nested doc with the same id leaving us with two children with the same id.
• "set" - replaces the whole list of child docs with the single doc, we could use this but would first have to fetch all the existing children.
• "add-distinct" - will reject the update based on the doc already being present.

I've got some changes (see patch) that a new option "merge" which checks based on the id and merges the new document with the old with a fall back to add if there is no id match.

 

 

Issue Links

• is related to: SOLR-15810 Solr文档可以添加相同ID的嵌套文档