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説明
RFC: multi-generation log cache
As discussion in #840 , jraft keeps a cache for latest log entries, it's unlimited and may consume too much memory under write-heavy workload or catching up replication when node restarts.
I think we can abstracts a cache interface and provide a multi-generation cache to replace current one:
- Gen-1: totaly in memory with limited capacity.
- Gen-2: Off-heap cache.When Gen-1 overflows, move the LRU(least recently used) item into off-heap cache such as OHC.
Main goals:
- Abstracts log cache interface.
- Provide a multi-generation cache implementation.