Solr conditional adds/updates?

Question

I have a fairly simple need to do a conditional update in Solr, which is easily accomplished in MySQL.

For example,

• I have 100 documents with a unique

Answer 1

As of solr 4.0, optimistic concurrency is enabled via the _version_ field.

http://yonik.com/solr/optimistic-concurrency/

To enable, you need to make sure your schema.xml contains

and in solrconfig.xml

    
      ${solr.data.dir:}