When hitting a memcache chunks cache with 100% cache hit rate, it looks like the results are being written back into the cache again - which uses double the network bandwidth and we are seeing our caches limited on bandwith.
For example on this query results it suggest 100% hits:
cache_chunk_bytes_fetched 19972600673
cache_chunk_bytes_stored 0
cache_chunk_hit 15163
cache_chunk_req 15163
but we are seeing equal in and out network on the node and I’d expect the ingress to be negligble.
Feels like its writing back the previously cached entries?