taojintianxia commented on issue #21400:
URL:
https://github.com/apache/shardingsphere/issues/21400#issuecomment-1272963458
**Usage**
The cache action first searches for cache hits for key and restore-keys in
the branch containing the workflow run. If there are no hits in the current
branch, the cache action searches for key and restore-keys in the parent branch
and upstream branches.
restore-keys allows you to specify a list of alternate restore keys to use
when there is a cache miss on key. You can create multiple restore keys ordered
from the most specific to least specific. The cache action searches the
restore-keys in sequential order. When a key doesn't match directly, the action
searches for keys prefixed with the restore key. If there are multiple partial
matches for a restore key, the action returns the most recently created cache.
#### Example using multiple restore keys
```
restore-keys: |
npm-feature-${{ hashFiles('package-lock.json') }}
npm-feature-
npm-
```
The runner evaluates the expressions, which resolve to these restore-keys:
```
restore-keys: |
npm-feature-d5ea0750
npm-feature-
npm-
```
The restore key npm-feature- matches any key that starts with the string
npm-feature-. For example, both of the keys npm-feature-fd3052de and
npm-feature-a9b253ff match the restore key. The cache with the most recent
creation date would be used. The keys in this example are searched in the
following order:
1. npm-feature-d5ea0750 matches a specific hash.
2. npm-feature- matches cache keys prefixed with npm-feature-.
3. npm- matches any keys prefixed with npm-.
#### Example of search priority
1. Key npm-feature-d5ea0750 in the feature branch
2. Key npm-feature- in the feature branch
3. Key npm- in the feature branch
4. Key npm-feature-d5ea0750 in the main branch
5. Key npm-feature- in the main branch
6. Key npm- in the main branch
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