curvefs/client: optimizing the read amplification problem(especial me… #2792
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wu-hanqing
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| @@ -0,0 +1,307 @@ | |||
| /* | |||
| * Copyright (c) 2021 NetEase Inc. | |||
| LOG(WARNING) << "download object: " << name << " timeout"; | ||
| return false; | ||
| } | ||
| } while (!s3ClientAdaptor_->GetDiskCacheManager()->IsCached(name)); |
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There are multi same operations, maybe you can use one function to replace this chain operation.
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…mcached)
memcached does not support partial reads (object size：4MB in Curve) of an object, but the io will not exceed 128KB in linux kernel(1MB in kernel 4.20+).so for sequential reads, this will cause memcached write amplification is：4MB/128KB = 40 .
To solve this problem, we cache the first read memcached object locally.