perf: avoid unnecessary copy operation #3376
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* optime: reduce unnecessary copy operations * add a comment * trigger CI without code changes, because the bug of docker * add comments
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* optime: reduce unnecessary copy operations * add a comment * trigger CI without code changes, because the bug of docker * add comments
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ring.goring.goIn struct
Ring, the size of shards can be up to 100 (#2190 (comment)), in this case, a copy operation is called for each heartbeat, and approximately 3.1 KB data are copied. This is a waste of CPU resources. So avoiding copy operations yields benefits.The pr #2931 reported a race here, but there actually isn't one. Because every time we get the slice
c.shards.list, we don't change slice itself, we only usec.shards.list[i].Clientwhich is concurrency-safe.