Hi there We are currently moving from Solr 1.4 to 3.4 and we are seeing a few issues with adding documents. We do a delete by query and then do a lot of adds, about 100k before we do a commit and optimise. With 1.4 this was all fine, not super quick but didn't see any problems. With 3.4 the rate of adding documents seriously degrades. For our one index at about 80% it severely slows down but struggles and completes. For the other index which has quite a few more fields (up to 6000+ for some documents) it slows down at about 20%.
If we do periodic commits then we don't see the slowdown, but that causes us some other issues with replication etc. and while we can go down that route if we really must we would like to know what has changed from 1.4 to 3.4 to cause this behaviour. I have tried changing the LuceneMatchVersion to LUCENE_34 and upped to memory from 2GB to 4GB on a machine with 8GB ram but it really doesn't make any difference to the behaviour. Don't see any errors in the log files. Any ideas of what we could try to diagnose or fix the problem? -- Willem Basson
