On 5/24/2022 5:42 PM, Paul Russell wrote:
--A: Upgraded SOLR on the exiting servers utilizing the current indexes. We have plans to reindex and flatten the structure but we're not ready for that yet. With the release of SOLR 9 we need to get to a supported version now. We had planned on reindexing when we go to SOLR 9
With indexes originally built by Solr 7, you will not be able to upgrade to Solr 9 and use the same indexes. The 7.x version is written into the indexes and even a forced merge down to one segment with 8.x will not remove it. You will have to reindex from scratch in either 8.x or 9.x to be able to use the indexes in 9.x.
If upgrading from 7.x to 8.x with no other changes was enough to cause OOME exceptions, then you were probably on the hairy edge of seeing them in 7.x as well. Have you seen the exception? Do you know what resource was depleted? It is not ALWAYS memory, despite Memory being in the exception name. I'd hate to try and chase down a memory issue when what it's really running out of is processes or file handles.
Do you know anything about applying patches? If you apply the latest patch I attached to the following issue, you can find out what caused the OOME even if it never shows up in solr.log:
https://issues.apache.org/jira/browse/SOLR-9168 You will need at least Java 8u92 to be able to use that patch. Thanks, Shawn
