refactor: avoid unnecessary parent creating in Redis service

[ClSlaid]

Signed-off-by: ClSlaid [email protected]

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Summary

To maintain a consensus directory tree, the Redis service will create all parent directories from down to top. This takes the time complexity of $O(n)$ for files with a depth of $n$ directories.

But usually, after a period of warming up, most files will be created under a relatively short additional depth, growing from existing parent directories. Because no metadata of parent directories will be changed, this could be skipped.

This PR will save the time wasted on redundant parent directory creations.

Pros

• saving time wasted on redundant creations

Cons

• taking additional time (much depending on network TTL) checking on the warming up period