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minio/cmd/prepare-storage.go

328 lines
10 KiB

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"fmt"
"os"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/sync/errgroup"
)
var printEndpointError = func() func(Endpoint, error) {
printOnce := make(map[Endpoint]map[string]bool)
return func(endpoint Endpoint, err error) {
reqInfo := (&logger.ReqInfo{}).AppendTags("endpoint", endpoint.String())
ctx := logger.SetReqInfo(context.Background(), reqInfo)
m, ok := printOnce[endpoint]
if !ok {
m = make(map[string]bool)
m[err.Error()] = true
printOnce[endpoint] = m
logger.LogAlwaysIf(ctx, err)
return
}
if m[err.Error()] {
return
}
m[err.Error()] = true
logger.LogAlwaysIf(ctx, err)
}
}()
// Migrates backend format of local disks.
func formatXLMigrateLocalEndpoints(endpoints EndpointList) error {
g := errgroup.WithNErrs(len(endpoints))
for index, endpoint := range endpoints {
if !endpoint.IsLocal {
continue
}
index := index
g.Go(func() error {
epPath := endpoints[index].Path
formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
if _, err := os.Stat(formatPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
return formatXLMigrate(epPath)
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// Cleans up tmp directory of local disks.
func formatXLCleanupTmpLocalEndpoints(endpoints EndpointList) error {
g := errgroup.WithNErrs(len(endpoints))
for index, endpoint := range endpoints {
if !endpoint.IsLocal {
continue
}
index := index
g.Go(func() error {
epPath := endpoints[index].Path
// If disk is not formatted there is nothing to be cleaned up.
formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
if _, err := os.Stat(formatPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
if _, err := os.Stat(pathJoin(epPath, minioMetaTmpBucket+"-old")); err != nil {
if !os.IsNotExist(err) {
return err
}
}
// Need to move temporary objects left behind from previous run of minio
// server to a unique directory under `minioMetaTmpBucket-old` to clean
// up `minioMetaTmpBucket` for the current run.
//
// /disk1/.minio.sys/tmp-old/
// |__ 33a58b40-aecc-4c9f-a22f-ff17bfa33b62
// |__ e870a2c1-d09c-450c-a69c-6eaa54a89b3e
//
// In this example, `33a58b40-aecc-4c9f-a22f-ff17bfa33b62` directory contains
// temporary objects from one of the previous runs of minio server.
if err := renameAll(pathJoin(epPath, minioMetaTmpBucket),
pathJoin(epPath, minioMetaTmpBucket+"-old", mustGetUUID())); err != nil {
return err
}
// Removal of tmp-old folder is backgrounded completely.
go removeAll(pathJoin(epPath, minioMetaTmpBucket+"-old"))
return mkdirAll(pathJoin(epPath, minioMetaTmpBucket), 0777)
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// validate reference format against list of XL formats.
func validateXLFormats(format *formatXLV3, formats []*formatXLV3, endpoints EndpointList, setCount, drivesPerSet int) error {
for i := range formats {
if formats[i] == nil {
continue
}
if err := formatXLV3Check(format, formats[i]); err != nil {
return fmt.Errorf("%s format error: %s", endpoints[i], err)
}
}
if len(format.XL.Sets) != setCount {
return fmt.Errorf("Current backend format is inconsistent with input args (%s), Expected set count %d, got %d", endpoints, len(format.XL.Sets), setCount)
}
if len(format.XL.Sets[0]) != drivesPerSet {
return fmt.Errorf("Current backend format is inconsistent with input args (%s), Expected drive count per set %d, got %d", endpoints, len(format.XL.Sets[0]), drivesPerSet)
}
return nil
}
// Following error message is added to fix a regression in release
// RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3. This
// migration failed to capture '.This' field properly which indicates
// the disk UUID association. Below error message is returned when
// we see this situation in format.json, for more info refer
// https://github.com/minio/minio/issues/5667
var errXLV3ThisEmpty = fmt.Errorf("XL format version 3 has This field empty")
// connect to list of endpoints and load all XL disk formats, validate the formats are correct
// and are in quorum, if no formats are found attempt to initialize all of them for the first
// time. additionally make sure to close all the disks used in this attempt.
func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints EndpointList, setCount, drivesPerSet int) (*formatXLV3, error) {
// Initialize all storage disks
storageDisks, err := initStorageDisks(endpoints)
if err != nil {
return nil, err
}
defer closeStorageDisks(storageDisks)
// Attempt to load all `format.json` from all disks.
formatConfigs, sErrs := loadFormatXLAll(storageDisks)
// Check if we have
for i, sErr := range sErrs {
if _, ok := formatCriticalErrors[sErr]; ok {
return nil, fmt.Errorf("Disk %s: %s", endpoints[i], sErr)
}
}
// Connect to all storage disks, a connection failure will be
// only logged after some retries.
for _, disk := range storageDisks {
if disk != nil {
connectErr := disk.LastError()
if connectErr != nil && retryCount >= 5 {
logger.Info("Unable to connect to %s: %v\n", disk.String(), connectErr.Error())
}
}
}
// Pre-emptively check if one of the formatted disks
// is invalid. This function returns success for the
// most part unless one of the formats is not consistent
// with expected XL format. For example if a user is
// trying to pool FS backend into an XL set.
if err = checkFormatXLValues(formatConfigs); err != nil {
return nil, err
}
// All disks report unformatted we should initialized everyone.
if shouldInitXLDisks(sErrs) && firstDisk {
// Initialize erasure code format on disks
format, err := initFormatXL(context.Background(), storageDisks, setCount, drivesPerSet)
if err != nil {
return nil, err
}
// Assign globalDeploymentID on first run for the
// minio server managing the first disk
globalDeploymentID = format.ID
}
// Return error when quorum unformatted disks - indicating we are
// waiting for first server to be online.
if quorumUnformattedDisks(sErrs) && !firstDisk {
return nil, errNotFirstDisk
}
// Return error when quorum unformatted disks but waiting for rest
// of the servers to be online.
if quorumUnformattedDisks(sErrs) && firstDisk {
return nil, errFirstDiskWait
}
// Following function is added to fix a regressions which was introduced
// in release RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3.
// This migration failed to capture '.This' field properly which indicates
// the disk UUID association. Below function is called to handle and fix
// this regression, for more info refer https://github.com/minio/minio/issues/5667
if err = fixFormatXLV3(storageDisks, endpoints, formatConfigs); err != nil {
return nil, err
}
// If any of the .This field is still empty, we return error.
if formatXLV3ThisEmpty(formatConfigs) {
return nil, errXLV3ThisEmpty
}
format, err := getFormatXLInQuorum(formatConfigs)
if err != nil {
return nil, err
}
// Validate all format configs with reference format.
if err = validateXLFormats(format, formatConfigs, endpoints, setCount, drivesPerSet); err != nil {
return nil, err
}
// Get the deploymentID if set.
format.ID, err = formatXLGetDeploymentID(format, formatConfigs)
if err != nil {
return nil, err
}
if format.ID == "" {
if err = formatXLFixDeploymentID(context.Background(), endpoints, storageDisks, format); err != nil {
return nil, err
}
}
globalDeploymentID = format.ID
if err = formatXLFixLocalDeploymentID(context.Background(), endpoints, storageDisks, format); err != nil {
return nil, err
}
return format, nil
}
// Format disks before initialization of object layer.
func waitForFormatXL(ctx context.Context, firstDisk bool, endpoints EndpointList, setCount, disksPerSet int) (format *formatXLV3, err error) {
if len(endpoints) == 0 || setCount == 0 || disksPerSet == 0 {
return nil, errInvalidArgument
}
if err = formatXLMigrateLocalEndpoints(endpoints); err != nil {
return nil, err
}
if err = formatXLCleanupTmpLocalEndpoints(endpoints); err != nil {
return nil, err
}
// Done channel is used to close any lingering retry routine, as soon
// as this function returns.
doneCh := make(chan struct{})
// Indicate to our retry routine to exit cleanly, upon this function return.
defer close(doneCh)
// prepare getElapsedTime() to calculate elapsed time since we started trying formatting disks.
// All times are rounded to avoid showing milli, micro and nano seconds
formatStartTime := time.Now().Round(time.Second)
getElapsedTime := func() string {
return time.Now().Round(time.Second).Sub(formatStartTime).String()
}
// Wait on the jitter retry loop.
retryTimerCh := newRetryTimerSimple(doneCh)
for {
select {
case retryCount := <-retryTimerCh:
format, err := connectLoadInitFormats(retryCount, firstDisk, endpoints, setCount, disksPerSet)
if err != nil {
switch err {
case errNotFirstDisk:
// Fresh setup, wait for first server to be up.
logger.Info("Waiting for the first server to format the disks.")
continue
case errFirstDiskWait:
// Fresh setup, wait for other servers to come up.
logger.Info("Waiting for all other servers to be online to format the disks.")
continue
case errXLReadQuorum:
// no quorum available continue to wait for minimum number of servers.
logger.Info("Waiting for a minimum of %d disks to come online (elapsed %s)\n", len(endpoints)/2, getElapsedTime())
continue
case errXLV3ThisEmpty:
// need to wait for this error to be healed, so continue.
continue
default:
// For all other unhandled errors we exit and fail.
return nil, err
}
}
return format, nil
case <-globalOSSignalCh:
return nil, fmt.Errorf("Initializing data volumes gracefully stopped")
}
}
}