If an erasure set had a drive replacement recently, we don't need to attempt healing on another drive with in the same erasure set - this would ensure we do not double heal the same content and also prioritizes usage for such an erasure set to be calculated sooner.
175 lines
4.7 KiB
Go
175 lines
4.7 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2016-2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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"sync"
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"github.com/minio/minio/pkg/sync/errgroup"
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)
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func (er erasureObjects) getLoadBalancedLocalDisks() (newDisks []StorageAPI) {
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disks := er.getDisks()
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// Based on the random shuffling return back randomized disks.
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for _, i := range hashOrder(UTCNow().String(), len(disks)) {
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if disks[i-1] != nil && disks[i-1].IsLocal() {
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if !disks[i-1].Healing() && disks[i-1].IsOnline() {
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newDisks = append(newDisks, disks[i-1])
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}
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}
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}
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return newDisks
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}
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func (er erasureObjects) getOnlineDisks() (newDisks []StorageAPI) {
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disks := er.getDisks()
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var wg sync.WaitGroup
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var mu sync.Mutex
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for _, i := range hashOrder(UTCNow().String(), len(disks)) {
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i := i
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wg.Add(1)
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go func() {
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defer wg.Done()
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if disks[i-1] == nil {
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return
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}
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di, err := disks[i-1].DiskInfo(context.Background())
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if err != nil || di.Healing {
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// - Do not consume disks which are not reachable
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// unformatted or simply not accessible for some reason.
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//
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// - Do not consume disks which are being healed
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//
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// - Future: skip busy disks
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return
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}
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mu.Lock()
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newDisks = append(newDisks, disks[i-1])
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mu.Unlock()
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}()
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}
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wg.Wait()
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return newDisks
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}
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// getLoadBalancedNDisks - fetches load balanced (sufficiently randomized) disk slice
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// with N disks online. If ndisks is zero or negative, then it will returns all disks,
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// same if ndisks is greater than the number of all disks.
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func (er erasureObjects) getLoadBalancedNDisks(ndisks int) (newDisks []StorageAPI) {
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disks := er.getLoadBalancedDisks(ndisks != -1)
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for _, disk := range disks {
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if disk == nil {
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continue
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}
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newDisks = append(newDisks, disk)
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ndisks--
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if ndisks == 0 {
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break
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}
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}
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return
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}
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// getLoadBalancedDisks - fetches load balanced (sufficiently randomized) disk slice.
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// ensures to skip disks if they are not healing and online.
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func (er erasureObjects) getLoadBalancedDisks(optimized bool) []StorageAPI {
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disks := er.getDisks()
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if !optimized {
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var newDisks []StorageAPI
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for _, i := range hashOrder(UTCNow().String(), len(disks)) {
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newDisks = append(newDisks, disks[i-1])
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}
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return newDisks
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}
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var wg sync.WaitGroup
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var mu sync.Mutex
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var newDisks = map[uint64][]StorageAPI{}
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// Based on the random shuffling return back randomized disks.
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for _, i := range hashOrder(UTCNow().String(), len(disks)) {
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i := i
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wg.Add(1)
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go func() {
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defer wg.Done()
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if disks[i-1] == nil {
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return
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}
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di, err := disks[i-1].DiskInfo(context.Background())
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if err != nil || di.Healing {
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// - Do not consume disks which are not reachable
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// unformatted or simply not accessible for some reason.
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//
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// - Do not consume disks which are being healed
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//
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// - Future: skip busy disks
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return
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}
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mu.Lock()
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// Capture disks usage wise upto resolution of MiB
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newDisks[di.Used/1024/1024] = append(newDisks[di.Used/1024/1024], disks[i-1])
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mu.Unlock()
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}()
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}
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wg.Wait()
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var max uint64
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for k := range newDisks {
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if k > max {
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max = k
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}
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}
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// Return disks which have maximum disk usage common.
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return newDisks[max]
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}
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// This function does the following check, suppose
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// object is "a/b/c/d", stat makes sure that objects
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// - "a/b/c"
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// - "a/b"
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// - "a"
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// do not exist on the namespace.
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func (er erasureObjects) parentDirIsObject(ctx context.Context, bucket, parent string) bool {
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storageDisks := er.getDisks()
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g := errgroup.WithNErrs(len(storageDisks))
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for index := range storageDisks {
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index := index
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g.Go(func() error {
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if storageDisks[index] == nil {
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return errDiskNotFound
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}
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// Check if 'prefix' is an object on this 'disk', else continue the check the next disk
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return storageDisks[index].CheckFile(ctx, bucket, parent)
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}, index)
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}
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// NOTE: Observe we are not trying to read `xl.meta` and figure out the actual
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// quorum intentionally, but rely on the default case scenario. Actual quorum
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// verification will happen by top layer by using getObjectInfo() and will be
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// ignored if necessary.
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readQuorum := getReadQuorum(len(storageDisks))
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return reduceReadQuorumErrs(ctx, g.Wait(), objectOpIgnoredErrs, readQuorum) == nil
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}
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