Fixes RamUsageEstimator performance issue in tiered caching framework #16
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Description
Computes the estimated RAM size of IRC Key objects and IndicesService.IndexShardCacheEntity objects just once, rather than every time one gets instantiated. This was causing ~5% performance overhead in tiered caching relative to baseline. These classes were static before our tiered caching changes, so this should not cause any issues.
Related Issues
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