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39db15d2cb
This patch avoids unncessary CACHE_HITRATES updates through gossip. After this patch: Publish CACHE_HITRATES in case: - We haven't published it at all - The diff is bigger than 1% and we haven't published in the last 5 seconds - The diff is really big 10% Note: A peer node can know the cache hitrate through read_data read_mutation_data and read_digest RPC verbs which have cache_temperature in the response. So there is no need to update CACHE_HITRATES through gossip in high frequency. We do the recalculation faster if the diff is bigger than 0.01. It is useful to do the calculation even if we do not publish the CACHE_HITRATES though gossip, since the recalculation will call the table->set_global_cache_hit_rate to set the hitrate. Fixes #5971 Closes #11079