Versioning and Optimistic Locking in Solr 4.0?

问题:

I saw

Versioning and Optimistic Locking – combined with real-time get, this allows read-update-write functionality that ensures no conflicting changes were made concurrently by other clients.

from http://searchhub.org/dev/2012/05/21/solr-4-preview/ and other sources. Although it is very interesting, there is few other mentions on this topic.

Can someone explain this feature?

回答1:

I cannot fully explain this feature. But, here are some additional links from the Solr Issues and Wiki that provide more details. With the official release of Solr 4.0 today, I am hopeful that more details and examples of how these features work will begin to emerge.

• SOLR-3178 - Versioning - optimistic locking
• Update Semantics
• Real-Time Get