On 1/27/2016 8:59 AM, David Smith wrote: > So we definitely don’t have CP yet — our very first network outage resulted > in multiple overlapped lost updates. As a result, I can’t pick one replica > and make it the new “master”. I must rebuild this collection from scratch, > which I can do, but that requires downtime which is a problem in our app > (24/7 High Availability with few maintenance windows).
I don't have anything to add regarding the initial problem or how you can prevent it from happening again. You're already on the latest minor Solr version (5.4), though I think you could probably upgrade to 5.4.1. The list of bugfixes for 5.4.1 does not seem to include anything that could explain the problem you have described. There is SOLR-8496, but that only affects multi-select faceting, not the numDoc counts on the core summary screen. For the specific issue mentioned above (rebuilding without downtime), what I would recommend that you do is build an entirely new collection, then delete the old one and create an alias to the new collection using the old collection's name. Deleting the old collection and making the alias should happen very quickly. I don't think any documentation states this, but it seems like a good idea to me use an alias from day one, so that you always have the option of swapping the "real" collection that you are using without needing to change anything else. I'll need to ask some people if they think this is a good documentation addition, and think of a good place to mention it in the reference guide. Thanks, Shawn
