d941c64edb
Today we still maintain a version map even if we only index append-only or in other words, documents with auto-generated IDs. We can instead maintain an un-safe version map that will be swapped to a safe version map only if necessary once we see the first document that requires access to the version map. For instance: * a auto-generated id retry * any kind of deletes * a document with a foreign ID (non-autogenerated In these cases we forcefully refresh then internal reader and start maintaining a version map until such a safe map wasn't necessary for two refresh cycles. Indices / shards that never see an autogenerated ID document will always meintain a version map and in the case of a delete / retry in a pure append-only index the version map will be de-optimized for a short amount of time until we know it's safe again to swap back. This will also minimize the requried refeshes. Closes #19813 |
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