Commits

Dana Robinson committed 37845204370
Bring over support for retrying metadata cache entry loads, along with all the supporting metadata cache callback changes, etc. (cherry picked from commit 3b0c2b24da5689990c4bc0fcd3afecdf063086c8)
Bring over support for retrying metadata cache entry loads, along with all the supporting metadata cache callback changes, etc. (cherry picked from commit 3b0c2b24da5689990c4bc0fcd3afecdf063086c8)