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optimize mkdir calls to avoid base-dir Mkdir attempts (#18021)

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Currently we have IOPs of these patterns

```
[OS] os.Mkdir play.min.io:9000 /disk1 2.718µs
[OS] os.Mkdir play.min.io:9000 /disk1/data 2.406µs
[OS] os.Mkdir play.min.io:9000 /disk1/data/.minio.sys 4.068µs
[OS] os.Mkdir play.min.io:9000 /disk1/data/.minio.sys/tmp 2.843µs
[OS] os.Mkdir play.min.io:9000 /disk1/data/.minio.sys/tmp/d89c8ceb-f8d1-4cc6-b483-280f87c4719f 20.152µs
```

It can be seen that we can save quite Nx levels such as
if your drive is mounted at `/disk1/minio` you can simply
skip sending an `Mkdir /disk1/` and `Mkdir /disk1/minio`.

Since they are expected to exist already, this PR adds a way
for us to ignore all paths upto the mount or a directory which
ever has been provided to MinIO setup.
This commit is contained in:
Harshavardhana
2023-09-13 08:14:36 -07:00
committed by GitHub
parent 96fbf18201
commit 8b8be2695f
11 changed files with 60 additions and 50 deletions
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2
cmd/metacache-server-pool.go
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@@ -38,7 +38,7 @@ func renameAllBucketMetacache(epPath string) error {
if typ == os.ModeDir {
tmpMetacacheOld := pathutil.Join(epPath, minioMetaTmpDeletedBucket, mustGetUUID())
if err := renameAll(pathJoin(epPath, minioMetaBucket, metacachePrefixForID(name, slashSeparator)),
tmpMetacacheOld); err != nil && err != errFileNotFound {
tmpMetacacheOld, epPath); err != nil && err != errFileNotFound {
return fmt.Errorf("unable to rename (%s -> %s) %w",
pathJoin(epPath, minioMetaBucket+metacachePrefixForID(minioMetaBucket, slashSeparator)),
tmpMetacacheOld,