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https://issues.apache.org/jira/browse/SOLR-9102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280125#comment-15280125
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Joel Bernstein commented on SOLR-9102:
--------------------------------------

I believe the key thing that needs to be done to support a transactional put() 
is to support that ability to rollback / abort.

I think the best approach for adding rollback / abort  capabilities to 
SolrCloud,  is to add an *undo log* that works with the existing redo log. 

> Add get() and transactional put() Streaming Expressions
> -------------------------------------------------------
>
>                 Key: SOLR-9102
>                 URL: https://issues.apache.org/jira/browse/SOLR-9102
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>
> It would be useful to add *get()* and *put()* Streaming Expressions that 
> allows SolrCloud to be behave like a transactional distributed key/value 
> store. This will allow Solr's real-time get and multi-get capabilities to be 
> easily combined with other expressions.
> Sample get syntax:
> {code}
> get(collection, ids="a,b,c")
> {code}
> This ticket will also explore the possibility of adding a *transactional* 
> put. Different transaction schemes will be explored.
> {code}
> put(collection, id="a", fieldA="aaab", fieldC="blah blah")
> {code}



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