thanks for your answer & illustration Bill..
I guess that :
during the optimization, the update request will be recorded into one file,
then after the optimization, it will be merged.
Do u think that I should replicate the master ? to make update can perform
seamlessly ?
One more thing.. about
Your first and second conclusions are right, but not the third one.
Solr does not distribute the queries from clients to the slaves. You need
to do that yourself (for example, use a load balancer in front of your pool
of Solr slaves).
I think that when Solr is optimizing the index all update req
