If you are experiencing slow Import / Updates there is a setting in solrconfig.xml that can dramatically affect the indexing time.
As described in the Solr Documentation mergeFactor is an important consideration. The only issue being the higher you set the mergeFactor the slower the response for a search query is going to be . The question then becomes how much that matters to you. If your index only needs updating every week then you could set the mergeFactor to a low setting and get rapid searches. On the other hand if you need your search results updated more frequently then you will have to set it higher (depending on the amount of content in your domain.) Possibly having a negative impact on the speed of your search responses.
mergeFactor Tradeoffs
High value merge factor (e.g., 25):
- Pro: Generally improves indexing speed
- Con: Less frequent merges, resulting in a collection with more index files which may slow searching
Low value merge factor (e.g., 2):
- Pro: Smaller number of index files, which speeds up searching.
- Con: More segment merges slow down indexing.
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