问题
I am new to Solr and I'm curious what the procedure is for changing/updating the schema?
I noticed that I can ADD new fields easily without causing any issues, but any time that I've had to UPDATE a field, it's caused issues.
Due to the amount of data ingested into the system, I will not be able to retain the original data that was used to generate the add/doc queries to solr, so I'll be unable to simply re-index everything when a change occurs.
For instance, I am looking to change an existing field from the type "string" to "text", and the text field type has many tokenizers, filters, etc that I would like to put to use immediately on the existing data.
I am ideally looking for a way to update the schema, re-index/optimize the existing data set, and be able to track how long it will take until the operation is complete.
If someone can help me understand this I would much appreciate it!
回答1:
You have to reindex. There is no other way around it. Indexing is a destructive process with relation to its input: text is sliced and diced to make it faster for search, so you can't recover the original text unless you had it in a stored field. (stored=true in your Solr field definition in schema.xml). If you did have it in a stored field, all you have to do is a little process to iterate through the documents and just re-send them so they're reindexed.
来源：https://stackoverflow.com/questions/6038920/updating-solr-schema