: Many are confused about the rollback feature in Solr, since it cannot 
: guarantee a rollback of updates from that client since last commit.
: 
: In my opinion it is pretty useless to have a rollback feature you cannot 
: rely upon - Unless, that is, you are the only client for sure, having no 
: autoCommit, and a huge RAMbuffer.
: 
: So why don't we simply deprecate the feature in 4.x and remove it from 5.0?

+1 ... i don't remember the details of how/why/where rollback works, but 
as i understand it, there are some serious caveats to it's usage, as well 
as some bugs that may not have any viable/simple solutions (at least as 
far as i know of).

example...
https://issues.apache.org/jira/browse/SOLR-4733


-Hoss

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