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https://issues.apache.org/jira/browse/SOLR-17851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18013551#comment-18013551
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Gus Heck commented on SOLR-17851:
---------------------------------

And the punchline is that the ObjectCache [~ab] added in SOLR-11642 is quite 
similar in concept to my original implementation for SOLR-8349 (I also used a 
field on CoreContainer) before I was convinced to move it to the blob store.

So I guess if we have a unit test that demonstrates that two cores can access 
the same cached object, and perhaps find a place to document this feature 
(something my original ticket unfortunately lacked in retrospect).. I guess 
that should go as a note/hint in the ref guide where we mention custom 
components... Although looking it doesn't seem like we really address writing 
your own.

> Remove BlobHandler and .system collection from 10
> -------------------------------------------------
>
>                 Key: SOLR-17851
>                 URL: https://issues.apache.org/jira/browse/SOLR-17851
>             Project: Solr
>          Issue Type: Task
>          Components: blobstore
>    Affects Versions: main (10.0)
>            Reporter: Eric Pugh
>            Assignee: Eric Pugh
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: remove-blob-handler.patch
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Once the Schema Designer migration to the Filestore API is completed, we 
> should remove the BlobHandler and associated .system collection.   
> This issue proposes deprecating it in 9x now and removing in 10.



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