minio/cmd/prepare-storage.go
Harshavardhana 187c3f62df
fix: heal replaced drives properly (#10069)
healing was not working properly when drives were
replaced, due to the error check in root disk
calculation this PR fixes this behavior

This PR also adds additional fix for missing
metadata entries from .minio.sys as part of
disk healing as well.

Added code to ignore and print more context
sensitive errors for better debugging.

This PR is continuation of fix in 7b14e9b660
2020-07-17 10:08:04 -07:00

405 lines
13 KiB
Go

/*
* 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 (
"crypto/tls"
"fmt"
"net/http"
"net/url"
"os"
"path"
"sync"
"time"
"github.com/dustin/go-humanize"
"github.com/minio/minio/cmd/config"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/sync/errgroup"
)
var printEndpointError = func() func(Endpoint, error, bool) {
var mutex sync.Mutex
printOnce := make(map[Endpoint]map[string]int)
return func(endpoint Endpoint, err error, once bool) {
reqInfo := (&logger.ReqInfo{}).AppendTags("endpoint", endpoint.String())
ctx := logger.SetReqInfo(GlobalContext, reqInfo)
mutex.Lock()
defer mutex.Unlock()
m, ok := printOnce[endpoint]
if !ok {
m = make(map[string]int)
m[err.Error()]++
printOnce[endpoint] = m
if once {
logger.LogAlwaysIf(ctx, err)
return
}
}
// Once is set and we are here means error was already
// printed once.
if once {
return
}
// once not set, check if same error occurred 3 times in
// a row, then make sure we print it to call attention.
if m[err.Error()] > 2 {
logger.LogAlwaysIf(ctx, fmt.Errorf("Following error has been printed %d times.. %w", m[err.Error()], err))
// Reduce the count to introduce further delay in printing
// but let it again print after the 2th attempt
m[err.Error()]--
m[err.Error()]--
}
m[err.Error()]++
}
}()
// Migrates backend format of local disks.
func formatErasureMigrateLocalEndpoints(endpoints Endpoints) 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 fmt.Errorf("unable to access (%s) %w", formatPath, err)
}
return formatErasureMigrate(epPath)
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// Cleans up tmp directory of local disks.
func formatErasureCleanupTmpLocalEndpoints(endpoints Endpoints) 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 fmt.Errorf("unable to access (%s) %w", formatPath, err)
}
if _, err := os.Stat(pathJoin(epPath, minioMetaTmpBucket+"-old")); err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("unable to access (%s) %w",
pathJoin(epPath, minioMetaTmpBucket+"-old"),
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.
tmpOld := pathJoin(epPath, minioMetaTmpBucket+"-old", mustGetUUID())
if err := renameAll(pathJoin(epPath, minioMetaTmpBucket),
tmpOld); err != nil && err != errFileNotFound {
return fmt.Errorf("unable to rename (%s -> %s) %w",
pathJoin(epPath, minioMetaTmpBucket),
tmpOld,
err)
}
// Removal of tmp-old folder is backgrounded completely.
go removeAll(pathJoin(epPath, minioMetaTmpBucket+"-old"))
if err := mkdirAll(pathJoin(epPath, minioMetaTmpBucket), 0777); err != nil {
return fmt.Errorf("unable to create (%s) %w",
pathJoin(epPath, minioMetaTmpBucket),
err)
}
return nil
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
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 errErasureV3ThisEmpty = fmt.Errorf("Erasure format version 3 has This field empty")
// IsServerResolvable - checks if the endpoint is resolvable
// by sending a naked HTTP request with liveness checks.
func IsServerResolvable(endpoint Endpoint) error {
serverURL := &url.URL{
Scheme: endpoint.Scheme,
Host: endpoint.Host,
Path: path.Join(healthCheckPathPrefix, healthCheckLivenessPath),
}
var tlsConfig *tls.Config
if globalIsSSL {
tlsConfig = &tls.Config{
ServerName: endpoint.Hostname(),
RootCAs: globalRootCAs,
NextProtos: []string{"http/1.1"}, // Force http1.1
}
}
req, err := http.NewRequest(http.MethodGet, serverURL.String(), nil)
if err != nil {
return err
}
httpClient := &http.Client{
Transport:
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
&http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: xhttp.NewCustomDialContext(3 * time.Second),
ResponseHeaderTimeout: 5 * time.Second,
TLSHandshakeTimeout: 5 * time.Second,
ExpectContinueTimeout: 5 * time.Second,
TLSClientConfig: tlsConfig,
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
},
}
defer httpClient.CloseIdleConnections()
resp, err := httpClient.Do(req)
if err != nil {
return err
}
defer xhttp.DrainBody(resp.Body)
if resp.StatusCode != http.StatusOK {
return StorageErr(resp.Status)
}
return nil
}
// connect to list of endpoints and load all Erasure 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 Endpoints, zoneCount, setCount, drivesPerSet int, deploymentID string) (storageDisks []StorageAPI, format *formatErasureV3, err error) {
// Initialize all storage disks
storageDisks, errs := initStorageDisksWithErrors(endpoints)
defer func(storageDisks []StorageAPI) {
if err != nil {
closeStorageDisks(storageDisks)
}
}(storageDisks)
for i, err := range errs {
if err != nil {
if err != errDiskNotFound {
return nil, nil, fmt.Errorf("Disk %s: %w", endpoints[i], err)
}
if retryCount >= 5 {
logger.Info("Unable to connect to %s: %v\n", endpoints[i], IsServerResolvable(endpoints[i]))
}
}
}
// Attempt to load all `format.json` from all disks.
formatConfigs, sErrs := loadFormatErasureAll(storageDisks, false)
// Check if we have
for i, sErr := range sErrs {
if _, ok := formatCriticalErrors[sErr]; ok {
return nil, nil, config.ErrCorruptedBackend(err).Hint(fmt.Sprintf("Clear any pre-existing content on %s", endpoints[i]))
}
// not critical error but still print the error, nonetheless, which is perhaps unhandled
if sErr != errUnformattedDisk && sErr != errDiskNotFound && retryCount >= 5 {
if sErr != nil {
logger.Info("Unable to read 'format.json' from %s: %v\n", endpoints[i], sErr)
}
}
}
// 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 Erasure format. For example if a user is
// trying to pool FS backend into an Erasure set.
if err = checkFormatErasureValues(formatConfigs, drivesPerSet); err != nil {
return nil, nil, err
}
// All disks report unformatted we should initialized everyone.
if shouldInitErasureDisks(sErrs) && firstDisk {
logger.Info("Formatting %s zone, %v set(s), %v drives per set.",
humanize.Ordinal(zoneCount), setCount, drivesPerSet)
// Initialize erasure code format on disks
format, err = initFormatErasure(GlobalContext, storageDisks, setCount, drivesPerSet, deploymentID)
if err != nil {
return nil, nil, err
}
// Assign globalDeploymentID on first run for the
// minio server managing the first disk
globalDeploymentID = format.ID
return storageDisks, format, nil
}
// Return error when quorum unformatted disks - indicating we are
// waiting for first server to be online.
if quorumUnformattedDisks(sErrs) && !firstDisk {
return nil, nil, errNotFirstDisk
}
// Return error when quorum unformatted disks but waiting for rest
// of the servers to be online.
if quorumUnformattedDisks(sErrs) && firstDisk {
return nil, 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 = fixFormatErasureV3(storageDisks, endpoints, formatConfigs); err != nil {
return nil, nil, err
}
// If any of the .This field is still empty, we return error.
if formatErasureV3ThisEmpty(formatConfigs) {
return nil, nil, errErasureV3ThisEmpty
}
format, err = getFormatErasureInQuorum(formatConfigs)
if err != nil {
return nil, nil, err
}
if format.ID == "" {
// Not a first disk, wait until first disk fixes deploymentID
if !firstDisk {
return nil, nil, errNotFirstDisk
}
if err = formatErasureFixDeploymentID(endpoints, storageDisks, format); err != nil {
return nil, nil, err
}
}
globalDeploymentID = format.ID
if err = formatErasureFixLocalDeploymentID(endpoints, storageDisks, format); err != nil {
return nil, nil, err
}
// The will always recreate some directories inside .minio.sys of
// the local disk such as tmp, multipart and background-ops
initErasureMetaVolumesInLocalDisks(storageDisks, formatConfigs)
return storageDisks, format, nil
}
// Format disks before initialization of object layer.
func waitForFormatErasure(firstDisk bool, endpoints Endpoints, zoneCount, setCount, drivesPerSet int, deploymentID string) ([]StorageAPI, *formatErasureV3, error) {
if len(endpoints) == 0 || setCount == 0 || drivesPerSet == 0 {
return nil, nil, errInvalidArgument
}
if err := formatErasureMigrateLocalEndpoints(endpoints); err != nil {
return nil, nil, err
}
if err := formatErasureCleanupTmpLocalEndpoints(endpoints); err != nil {
return nil, nil, err
}
// 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 each try for an update.
ticker := time.NewTicker(500 * time.Millisecond)
defer ticker.Stop()
var tries int
for {
select {
case <-ticker.C:
storageDisks, format, err := connectLoadInitFormats(tries, firstDisk, endpoints, zoneCount, setCount, drivesPerSet, deploymentID)
if err != nil {
tries++
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 errErasureReadQuorum:
// 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 errErasureV3ThisEmpty:
// need to wait for this error to be healed, so continue.
continue
default:
// For all other unhandled errors we exit and fail.
return nil, nil, err
}
}
return storageDisks, format, nil
case <-globalOSSignalCh:
return nil, nil, fmt.Errorf("Initializing data volumes gracefully stopped")
}
}
}