a34c2f0b8d
We cut over to internal and external IndexReader/IndexSearcher in #26972 which uses two independent searcher managers. This has the downside that refreshes of the external reader will never clear the internal version map which in-turn will trigger additional and potentially unnecessary segment flushes since memory must be freed. Under heavy indexing load with low refresh intervals this can cause excessive segment creation which causes high GC activity and significantly increases the required segment merges. This change adds a dedicated external reference manager that delegates refreshes to the internal reference manager that then `steals` the refreshed reader from the internal reference manager for external usage. This ensures that external and internal readers are consistent on an external refresh. As a sideeffect this also releases old segments referenced by the internal reference manager which can potentially hold on to already merged away segments until it is refreshed due to a flush or indexing activity. |
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