arana-db/kiwi

[ENHANCE] Incomplete block cache sharing implementation

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#143 opened on Sep 24, 2025

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P1good first issue✏️ Feature

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Description

Feature Description

The current implementation of share_block_cache is broken:

  • No configuration parsing for share-block-cache option
  • When share_block_cache=true, no block cache is created (inverted logic)
  • Each RocksDB instance creates separate block caches instead of sharing one

When share-block-cache=yes:

  • Create a single global block cache shared across all RocksDB instances
  • All Column Families use the shared cache instead of individual ones

Motivation

  1. Memory efficiency (single shared cache vs multiple individual caches)
  2. Better cache hit rates across all instances
  3. Proper configuration support

Additional Context

No response

Contributor guide

Research direction
Investigate the configuration parsing for share block cache option and fix the inverted logic where share block cache=true currently results in no shared cache. Ensure a single global block cache is created and shared across all RocksDB instances.
Tech stack
rust
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
RustRocksDB
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40