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Optimize Index() method to avoid unnecessary copies

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This commit is contained in:
wojtekt 2019-01-30 16:39:38 +01:00
parent d654b49c0e
commit 70b7513c7e
1 changed files with 13 additions and 6 deletions
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19
staging/src/k8s.io/client-go/tools/cache/thread_safe_store.go vendored
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@ -148,12 +148,19 @@ func (c *threadSafeMap) Index(indexName string, obj interface{}) ([]interface{},
}
index := c.indices[indexName]
// need to de-dupe the return list. Since multiple keys are allowed, this can happen.
returnKeySet := sets.String{}
for _, indexKey := range indexKeys {
set := index[indexKey]
for _, key := range set.UnsortedList() {
returnKeySet.Insert(key)
var returnKeySet sets.String
if len(indexKeys) == 1 {
// In majority of cases, there is exactly one value matching.
// Optimize the most common path - deduping is not needed here.
returnKeySet = index[indexKeys[0]]
} else {
// Need to de-dupe the return list.
// Since multiple keys are allowed, this can happen.
returnKeySet = sets.String{}
for _, indexKey := range indexKeys {
for key := range index[indexKey] {
returnKeySet.Insert(key)
}
}
}