> some folks who care enough to contribute fixes to it. Using another tool or > custom code to query the database and submit updates via the solr JSON api > or SolrJ client is currently recommended over DIH.
That’s why I had to write a tool to do the exporting from Oracle, massaging into JSON, and posting to Solr, before we migrated from Solr 4 to Solr 8 like OP is looking for. The big benefit of this is that it allowed me to have multiple importers running at once. A full reindex went from taking 8 hours via the DIH to taking about 90 minutes with 10 importers running. It also means that we don’t have to worry about the DIH connection as we migrate from Oracle 12 to Oracle 19, as OP is. OP seems to be in the same situation I was in a year ago. Andy
