17574: Update replication_confirmed fields after keep-balance run.

[arvados.git] / services / keep-balance / block_state.go

diff --git a/services/keep-balance/block_state.go b/services/keep-balance/block_state.go
index 029f8c6c0790337f561d679c8c9d21cf33ff502b..e30b4ff7943d4c4a041ec71924000a48a856c4d4 100644 (file)
--- a/services/keep-balance/block_state.go
+++ b/services/keep-balance/block_state.go
@@ -133,3 +133,53 @@ func (bsm *BlockStateMap) IncreaseDesired(pdh string, classes []string, n int, b
                bsm.get(blkid).increaseDesired(pdh, classes, n)
        }
 }
+
+// GetConfirmedReplication returns the replication level of the given
+// blocks, considering only the specified storage classes.
+//
+// If len(classes)==0, returns the replication level without regard to
+// storage classes.
+//
+// Safe to call concurrently with other calls to GetCurrent, but not
+// with different BlockStateMap methods.
+func (bsm *BlockStateMap) GetConfirmedReplication(blkids []arvados.SizedDigest, classes []string) int {
+       defaultClasses := map[string]bool{"default": true}
+       min := 0
+       for _, blkid := range blkids {
+               total := 0
+               perclass := make(map[string]int, len(classes))
+               for _, c := range classes {
+                       perclass[c] = 0
+               }
+               for _, r := range bsm.get(blkid).Replicas {
+                       total += r.KeepMount.Replication
+                       mntclasses := r.KeepMount.StorageClasses
+                       if len(mntclasses) == 0 {
+                               mntclasses = defaultClasses
+                       }
+                       for c := range mntclasses {
+                               n, ok := perclass[c]
+                               if !ok {
+                                       // Don't care about this storage class
+                                       continue
+                               }
+                               perclass[c] = n + r.KeepMount.Replication
+                       }
+               }
+               if total == 0 {
+                       return 0
+               }
+               for _, n := range perclass {
+                       if n == 0 {
+                               return 0
+                       }
+                       if n < min || min == 0 {
+                               min = n
+                       }
+               }
+               if len(perclass) == 0 && (min == 0 || min > total) {
+                       min = total
+               }
+       }
+       return min
+}