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226 lines
6.6 KiB
226 lines
6.6 KiB
/*
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* Minio Cloud Storage, (C) 2016 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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"time"
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"github.com/minio/minio-go/pkg/set"
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)
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// Channel where minioctl heal handler would notify if it were successful. This
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// would be used by waitForFormattingDisks routine to check if it's worth
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// retrying loadAllFormats.
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var globalWakeupCh chan struct{}
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func init() {
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globalWakeupCh = make(chan struct{}, 1)
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}
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/*
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Following table lists different possible states the backend could be in.
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* In a single-node, multi-disk setup, "Online" would refer to disks' status.
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* In a multi-node setup, it could refer to disks' or network connectivity
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between the nodes, or both.
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+----------+--------------------------+-----------------------+
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| Online | Format status | Course of action |
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| | | |
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-----------+--------------------------+-----------------------+
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| All | All Formatted | |
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+----------+--------------------------+ initObjectLayer |
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| Quorum | Quorum Formatted | |
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+----------+--------------------------+-----------------------+
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| All | Quorum | Print message saying |
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| | Formatted, | "Heal via minioctl" |
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| | some unformatted | and initObjectLayer |
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+----------+--------------------------+-----------------------+
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| All | None Formatted | FormatDisks |
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| | | and initObjectLayer |
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| | | |
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+----------+--------------------------+-----------------------+
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| | | Wait for notify from |
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| Quorum | | "Heal via minioctl" |
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| | Quorum UnFormatted | |
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+----------+--------------------------+-----------------------+
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| No | | Wait till enough |
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| Quorum | _ | nodes are online and |
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| | | one of the above |
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| | | sections apply |
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+----------+--------------------------+-----------------------+
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N B A disk can be in one of the following states.
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- Unformatted
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- Formatted
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- Corrupted
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- Offline
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*/
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// InitActions - a type synonym for enumerating initialization activities.
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type InitActions int
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const (
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// FormatDisks - see above table for disk states where it is applicable.
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FormatDisks InitActions = iota
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// WaitForHeal - Wait for disks to heal.
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WaitForHeal
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// WaitForQuorum - Wait for quorum number of disks to be online.
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WaitForQuorum
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// WaitForAll - Wait for all disks to be online.
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WaitForAll
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// WaitForFormatting - Wait for formatting to be triggered from the '1st' server in the cluster.
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WaitForFormatting
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// InitObjectLayer - Initialize object layer.
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InitObjectLayer
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// Abort initialization of object layer since there aren't enough good
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// copies of format.json to recover.
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Abort
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)
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func prepForInit(disks []string, sErrs []error, diskCount int) InitActions {
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// Count errors by error value.
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errMap := make(map[error]int)
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// If loadAllFormats returned successfully
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if sErrs == nil {
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errMap[nil] = diskCount
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} else {
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for _, err := range sErrs {
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errMap[err]++
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}
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}
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quorum := diskCount/2 + 1
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disksOffline := errMap[errDiskNotFound]
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disksFormatted := errMap[nil]
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disksUnformatted := errMap[errUnformattedDisk]
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disksCorrupted := errMap[errCorruptedFormat]
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// All disks are unformatted, proceed to formatting disks.
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if disksUnformatted == diskCount {
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// Only the first server formats an uninitialized setup, others wait for notification.
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if isLocalStorage(disks[0]) {
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return FormatDisks
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}
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return WaitForFormatting
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} else if (disksUnformatted >= quorum) && (disksUnformatted+disksOffline == diskCount) {
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return WaitForAll
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}
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// Already formatted, proceed to initialization of object layer.
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if disksFormatted == diskCount {
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return InitObjectLayer
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} else if disksFormatted >= quorum && disksFormatted+disksOffline == diskCount {
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return InitObjectLayer
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} else if disksFormatted >= quorum {
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// TODO: Print minioctl heal command
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return InitObjectLayer
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}
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// No Quorum.
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if disksOffline > quorum {
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return WaitForQuorum
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}
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// There is quorum or more corrupted disks, there is not enough good
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// disks to reconstruct format.json.
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if disksCorrupted >= quorum {
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return Abort
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}
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// Some of the formatted disks are possibly offline.
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return WaitForHeal
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}
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func retryFormattingDisks(disks []string, storageDisks []StorageAPI) ([]StorageAPI, error) {
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nextBackoff := time.Duration(0)
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var err error
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done := false
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for !done {
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select {
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case <-time.After(nextBackoff * time.Second):
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// Attempt to load all `format.json`.
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_, sErrs := loadAllFormats(storageDisks)
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switch prepForInit(disks, sErrs, len(storageDisks)) {
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case Abort:
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err = errCorruptedFormat
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done = true
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case FormatDisks:
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err = initFormatXL(storageDisks)
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done = true
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case InitObjectLayer:
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err = nil
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done = true
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}
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case <-globalWakeupCh:
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// Reset nextBackoff to reduce the subsequent wait and re-read
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// format.json from all disks again.
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nextBackoff = 0
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}
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}
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if err != nil {
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return nil, err
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}
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return storageDisks, nil
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}
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func waitForFormattingDisks(disks, ignoredDisks []string) ([]StorageAPI, error) {
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// FS Setup
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if len(disks) == 1 {
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storage, err := newStorageAPI(disks[0])
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if err != nil && err != errDiskNotFound {
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return nil, err
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}
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return []StorageAPI{storage}, nil
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}
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// XL Setup
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if err := checkSufficientDisks(disks); err != nil {
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return nil, err
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}
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disksSet := set.NewStringSet()
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if len(ignoredDisks) > 0 {
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disksSet = set.CreateStringSet(ignoredDisks...)
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}
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// Bootstrap disks.
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storageDisks := make([]StorageAPI, len(disks))
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for index, disk := range disks {
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// Check if disk is ignored.
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if disksSet.Contains(disk) {
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storageDisks[index] = nil
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continue
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}
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// Intentionally ignore disk not found errors. XL is designed
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// to handle these errors internally.
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storage, err := newStorageAPI(disk)
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if err != nil && err != errDiskNotFound {
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return nil, err
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}
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storageDisks[index] = storage
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}
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return retryFormattingDisks(disks, storageDisks)
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}
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