Hi All, I have a PR[1] to remove the "highest" field from VersionBucket (highest doc version of the bucket). By reading the code, I understand that this field is used for an optimization in the case of a distributed update and non-leader checking a doc version for an update. But I wondered about the usefulness of this optimization. I ran the SolrIndexing benchmark after removing this field (and cleaning all the code used to maintain it), and it shows no perf difference.
By removing this field (a long) from VersionBucket, we can save 500 MB of RAM per Core, because there are 64K VersionBucket. In addition it removes/simplifies code. I plan to merge the PR soon. Please comment there if you have any concerns. Thanks Bruno [1] https://github.com/apache/solr/pull/2021#issuecomment-1774115830
