X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/3facf89bf048487ee718fe15d012b489f2d407b7..8a27fe370239ecb8e50d53f46b45ed61203a35ca:/services/keepstore/volume.go?ds=sidebyside

diff --git a/services/keepstore/volume.go b/services/keepstore/volume.go
index 4d8a0aec7a..c3b8cd6283 100644
--- a/services/keepstore/volume.go
+++ b/services/keepstore/volume.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: AGPL-3.0
 
-package main
+package keepstore
 
 import (
 	"context"
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"math/big"
+	"sort"
 	"sync/atomic"
 	"time"
 
@@ -315,7 +316,7 @@ func makeRRVolumeManager(logger logrus.FieldLogger, cluster *arvados.Cluster, my
 		if err != nil {
 			return nil, fmt.Errorf("error initializing volume %s: %s", uuid, err)
 		}
-		logger.Printf("started volume %s (%s), ReadOnly=%v", uuid, vol, cfgvol.ReadOnly)
+		logger.Printf("started volume %s (%s), ReadOnly=%v", uuid, vol, cfgvol.ReadOnly || va.ReadOnly)
 
 		sc := cfgvol.StorageClasses
 		if len(sc) == 0 {
@@ -343,6 +344,36 @@ func makeRRVolumeManager(logger logrus.FieldLogger, cluster *arvados.Cluster, my
 			vm.writables = append(vm.writables, mnt)
 		}
 	}
+	// pri(mnt): return highest priority of any storage class
+	// offered by mnt
+	pri := func(mnt *VolumeMount) int {
+		any, best := false, 0
+		for class := range mnt.KeepMount.StorageClasses {
+			if p := cluster.StorageClasses[class].Priority; !any || best < p {
+				best = p
+				any = true
+			}
+		}
+		return best
+	}
+	// less(a,b): sort first by highest priority of any offered
+	// storage class (highest->lowest), then by volume UUID
+	less := func(a, b *VolumeMount) bool {
+		if pa, pb := pri(a), pri(b); pa != pb {
+			return pa > pb
+		} else {
+			return a.KeepMount.UUID < b.KeepMount.UUID
+		}
+	}
+	sort.Slice(vm.readables, func(i, j int) bool {
+		return less(vm.readables[i], vm.readables[j])
+	})
+	sort.Slice(vm.writables, func(i, j int) bool {
+		return less(vm.writables[i], vm.writables[j])
+	})
+	sort.Slice(vm.mounts, func(i, j int) bool {
+		return less(vm.mounts[i], vm.mounts[j])
+	})
 	return vm, nil
 }
 
@@ -362,18 +393,22 @@ func (vm *RRVolumeManager) AllReadable() []*VolumeMount {
 	return vm.readables
 }
 
-// AllWritable returns an array of all writable volumes
+// AllWritable returns writable volumes, sorted by priority/uuid. Used
+// by CompareAndTouch to ensure higher-priority volumes are checked
+// first.
 func (vm *RRVolumeManager) AllWritable() []*VolumeMount {
 	return vm.writables
 }
 
-// NextWritable returns the next writable
-func (vm *RRVolumeManager) NextWritable() *VolumeMount {
+// NextWritable returns writable volumes, rotated by vm.counter so
+// each volume gets a turn to be first. Used by PutBlock to distribute
+// new data across available volumes.
+func (vm *RRVolumeManager) NextWritable() []*VolumeMount {
 	if len(vm.writables) == 0 {
 		return nil
 	}
-	i := atomic.AddUint32(&vm.counter, 1)
-	return vm.writables[i%uint32(len(vm.writables))]
+	offset := (int(atomic.AddUint32(&vm.counter, 1)) - 1) % len(vm.writables)
+	return append(append([]*VolumeMount(nil), vm.writables[offset:]...), vm.writables[:offset]...)
 }
 
 // VolumeStats returns an ioStats for the given volume.