guojialiang

[merged segment warmer] Introduce merged segment checkpoint retention to avoid listAll in computeReferencedSegmentsCheckpoint

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### Description This PR is based on [[18720](https://github.com/opensearch-project/OpenSearch/pull/18720)]'s follow-up work. Based on the discussion with @ashking94, I made some optimizations. The main purpose is to avoid the `listAll` operation in...

[RFC] Avoid data loss in vanilla segment replication

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## Background In the production environment, we discovered the following issues with the primary promotion in segment replication and attempted to optimize them. This RFC mainly describes our solution and...

[RFC] Introduce concurrent translog recovery to accelerate segment replication primary promotion

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## Background The purpose of this RFC is to discuss the solution to the **long primary promotion time for segment replication** mentioned in https://github.com/opensearch-project/OpenSearch/issues/20118. Primary promotion may take up to...