When suddenly the Solr host is not available, all article saving goes south. The interface should somehow check if it is able to connect to the Solr host otherwise bail-out.
couldn't connect to host
Backtrace:
#0 D:\xampp\htdocs\...\extensions\SolrStore\SolrTalker.php(211): SolrTalker->solrSend('http://192.168....', '<add><doc><fiel...')
I love you for testing our Extension, we are going to fix this somehow. I could think of retrying to sent it to Solr for 5 times, but after that an error will be thrown.
The Bigger Problem is, that the SMW indexer have to stop until Solr is ready again. I have no idea how to tell him to Stop.
You can allays re-index your wiki by using the "Repair-Button" under Spezial:SMW-Administration, but thats no solution for the Problem.
Actually for the case above, Solr was not available because the server was restarted. Not sure about the inner working of Solr but certainly their must be method to check if Solr is ready to receive index values and in case it is not return true for the hook and marked the document as non-indexed.
Normally for any indexing services, you would have to have a status table on which one can track the current status of those documents, while I'm sure you don't want to introduce any special handling nor create a additional status table you could instead trace the status by creating a meta-subobject (with a special property) which is created and annotated to an entity (page) in case the status returns with anything other than successful. So either one can run a #ask query to find those subobjects or a special status page can pick those, display and allow for a mass re-index because running Special:SWMAdmin is not alwasy the best option (in our case we have around 1.1M triples which makes every Special:SWMAdmin run very costly).
I'll have to think about it, I'll find a nice solution
we have the same problem with re-indexing, it takes us 1-2 days for a Full rebuild. This is why we restart Solr only if we have changed our schema, because after the most schema changes you have to re-index to have all property's indexed the right way.
A Tip beside: Create your own solr schema for your wiki, for better query results. You can add stemmers, tokenizer and many more for your Data types or copyfields, where you can merge two fields into one. The most things are only interesting if you use the field based search.