On Jun 8, 2013, at 12:52 PM, Jamie Johnson <jej2...@gmail.com> wrote:
> When merging through the core admin ( > http://wiki.apache.org/solr/MergingSolrIndexes) what is the policy for > conflicts during the merge? So for instance if I am merging core 1 and > core 2 into core 0 (first example), what happens if core 1 and core 2 both > have a document with the same key, say core 1 has a newer version of core > 2? Does the merge fail, does the newer document remain? You end up with both documents, both with that ID - not generally a situation you want to end up in. You need to ensure unique id's in the input data or replace the index rather than merging into it. > > Also if using the srcCore method if a document with key 1 is written while > an index also with key 1 is being merged what happens? It depends on the order I think - if the doc is written after the merge and it's an update, it will update the doc that was just merged in. If the merge comes second, you have the doc twice and it's a problem. - Mark
