On 4/12/2016 6:10 AM, abhi Abhishek wrote: > I have SOLR 3.6 running currently, i am planning to upgrade this to > SOLR 4.10. Below were the thoughts we could come up with. > > 1. in place upgrade > I would be making the SOLR 4.10 slave of 3.6 and copy the indexes, > and optimize this index. > > will optimizing the Lucene 3.3 index on SOLR 4 instance(with Lucene > 4.10) change the index structure to Lucene 4.10? if not what would be the > version?
Yes, the optimize will change the index structure, but the contents of the index will not change, even if changes in Solr's analysis components would have resulted in different info going into the index based on your schema. Because the *query* analysis may also change with the upgrade, this might cause queries to no longer work the same, unless you reindex and verify that your analysis still does what you require. A few changes to analysis components in later versions can be changed back to earlier behavior with luceneMatchVersion, but this typically only happens with big changes -- such as the major bugfix for WordDelimiterFilterFactory in version 4.8. Reindexing for all upgrades is recommended when possible. > if i enable docvalues on certain fields before issuing optimize, will > it be able to incorporate ( create .dvd & .dvm files ) that in the newly > created index? No. You must entirely reindex to add docValues. Optimize just rewrites what's already present in the Lucene index. > 2. Re-Index the data > > Seeking advice for minimum time to upgrade this with most features of SOLR > 4.10 This is impossible to answer. It will depend on how long it takes to index your data. That is very difficult to predict even if a lot of information is available. Thanks, Shawn
