mirror of
https://github.com/minio/minio.git
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66174692a2
add a hint on the disk to allow for tracking fresh disk being healed, to allow for restartable heals, and also use this as a way to track and remove disks. There are more pending changes where we should move all the disk formatting logic to backend drives, this PR doesn't deal with this refactor instead makes it easier to track healing in the future.
407 lines
13 KiB
Go
407 lines
13 KiB
Go
/*
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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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"context"
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"crypto/tls"
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"fmt"
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"net/http"
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"net/url"
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"os"
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"path"
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"sync"
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"time"
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"github.com/dustin/go-humanize"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/sync/errgroup"
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)
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var printEndpointError = func() func(Endpoint, error, bool) {
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var mutex sync.Mutex
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printOnce := make(map[Endpoint]map[string]int)
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return func(endpoint Endpoint, err error, once bool) {
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reqInfo := (&logger.ReqInfo{}).AppendTags("endpoint", endpoint.String())
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ctx := logger.SetReqInfo(GlobalContext, reqInfo)
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mutex.Lock()
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defer mutex.Unlock()
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m, ok := printOnce[endpoint]
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if !ok {
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m = make(map[string]int)
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m[err.Error()]++
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printOnce[endpoint] = m
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if once {
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logger.LogAlwaysIf(ctx, err)
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return
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}
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}
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// Once is set and we are here means error was already
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// printed once.
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if once {
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return
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}
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// once not set, check if same error occurred 3 times in
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// a row, then make sure we print it to call attention.
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if m[err.Error()] > 2 {
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logger.LogAlwaysIf(ctx, fmt.Errorf("Following error has been printed %d times.. %w", m[err.Error()], err))
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// Reduce the count to introduce further delay in printing
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// but let it again print after the 2th attempt
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m[err.Error()]--
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m[err.Error()]--
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}
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m[err.Error()]++
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}
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}()
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// Migrates backend format of local disks.
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func formatErasureMigrateLocalEndpoints(endpoints Endpoints) error {
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g := errgroup.WithNErrs(len(endpoints))
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for index, endpoint := range endpoints {
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if !endpoint.IsLocal {
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continue
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}
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index := index
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g.Go(func() error {
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epPath := endpoints[index].Path
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formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
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if _, err := os.Stat(formatPath); err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return fmt.Errorf("unable to access (%s) %w", formatPath, err)
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}
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return formatErasureMigrate(epPath)
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}, index)
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}
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for _, err := range g.Wait() {
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Cleans up tmp directory of local disks.
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func formatErasureCleanupTmpLocalEndpoints(endpoints Endpoints) error {
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g := errgroup.WithNErrs(len(endpoints))
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for index, endpoint := range endpoints {
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if !endpoint.IsLocal {
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continue
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}
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index := index
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g.Go(func() error {
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epPath := endpoints[index].Path
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// If disk is not formatted there is nothing to be cleaned up.
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formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
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if _, err := os.Stat(formatPath); err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return fmt.Errorf("unable to access (%s) %w", formatPath, err)
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}
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if _, err := os.Stat(pathJoin(epPath, minioMetaTmpBucket+"-old")); err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("unable to access (%s) %w",
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pathJoin(epPath, minioMetaTmpBucket+"-old"),
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err)
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}
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}
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// Need to move temporary objects left behind from previous run of minio
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// server to a unique directory under `minioMetaTmpBucket-old` to clean
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// up `minioMetaTmpBucket` for the current run.
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//
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// /disk1/.minio.sys/tmp-old/
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// |__ 33a58b40-aecc-4c9f-a22f-ff17bfa33b62
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// |__ e870a2c1-d09c-450c-a69c-6eaa54a89b3e
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//
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// In this example, `33a58b40-aecc-4c9f-a22f-ff17bfa33b62` directory contains
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// temporary objects from one of the previous runs of minio server.
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tmpOld := pathJoin(epPath, minioMetaTmpBucket+"-old", mustGetUUID())
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if err := renameAll(pathJoin(epPath, minioMetaTmpBucket),
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tmpOld); err != nil && err != errFileNotFound {
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return fmt.Errorf("unable to rename (%s -> %s) %w",
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pathJoin(epPath, minioMetaTmpBucket),
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tmpOld,
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osErrToFileErr(err))
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}
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// Removal of tmp-old folder is backgrounded completely.
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go removeAll(pathJoin(epPath, minioMetaTmpBucket+"-old"))
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if err := mkdirAll(pathJoin(epPath, minioMetaTmpBucket), 0777); err != nil {
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return fmt.Errorf("unable to create (%s) %w",
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pathJoin(epPath, minioMetaTmpBucket),
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err)
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}
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return nil
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}, index)
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}
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for _, err := range g.Wait() {
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Following error message is added to fix a regression in release
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// RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3. This
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// migration failed to capture '.This' field properly which indicates
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// the disk UUID association. Below error message is returned when
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// we see this situation in format.json, for more info refer
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// https://github.com/minio/minio/issues/5667
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var errErasureV3ThisEmpty = fmt.Errorf("Erasure format version 3 has This field empty")
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// IsServerResolvable - checks if the endpoint is resolvable
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// by sending a naked HTTP request with liveness checks.
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func IsServerResolvable(endpoint Endpoint) error {
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serverURL := &url.URL{
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Scheme: endpoint.Scheme,
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Host: endpoint.Host,
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Path: path.Join(healthCheckPathPrefix, healthCheckLivenessPath),
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}
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var tlsConfig *tls.Config
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if globalIsSSL {
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tlsConfig = &tls.Config{
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ServerName: endpoint.Hostname(),
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RootCAs: globalRootCAs,
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}
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}
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httpClient := &http.Client{
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Transport:
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// For more details about various values used here refer
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// https://golang.org/pkg/net/http/#Transport documentation
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&http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: xhttp.NewCustomDialContext(3 * time.Second),
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ResponseHeaderTimeout: 5 * time.Second,
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TLSHandshakeTimeout: 5 * time.Second,
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ExpectContinueTimeout: 5 * time.Second,
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TLSClientConfig: tlsConfig,
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// Go net/http automatically unzip if content-type is
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// gzip disable this feature, as we are always interested
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// in raw stream.
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DisableCompression: true,
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},
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}
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defer httpClient.CloseIdleConnections()
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ctx, cancel := context.WithTimeout(GlobalContext, 5*time.Second)
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defer cancel()
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, serverURL.String(), nil)
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if err != nil {
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return err
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}
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resp, err := httpClient.Do(req)
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if err != nil {
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return err
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}
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defer xhttp.DrainBody(resp.Body)
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if resp.StatusCode != http.StatusOK {
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return StorageErr(resp.Status)
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}
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return nil
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}
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// connect to list of endpoints and load all Erasure disk formats, validate the formats are correct
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// and are in quorum, if no formats are found attempt to initialize all of them for the first
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// time. additionally make sure to close all the disks used in this attempt.
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func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints, zoneCount, setCount, setDriveCount int, deploymentID string) (storageDisks []StorageAPI, format *formatErasureV3, err error) {
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// Initialize all storage disks
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storageDisks, errs := initStorageDisksWithErrors(endpoints)
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defer func(storageDisks []StorageAPI) {
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if err != nil {
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closeStorageDisks(storageDisks)
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}
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}(storageDisks)
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for i, err := range errs {
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if err != nil {
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if err != errDiskNotFound {
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return nil, nil, fmt.Errorf("Disk %s: %w", endpoints[i], err)
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}
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if retryCount >= 5 {
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logger.Info("Unable to connect to %s: %v\n", endpoints[i], IsServerResolvable(endpoints[i]))
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}
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}
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}
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// Attempt to load all `format.json` from all disks.
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formatConfigs, sErrs := loadFormatErasureAll(storageDisks, false)
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// Check if we have
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for i, sErr := range sErrs {
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// print the error, nonetheless, which is perhaps unhandled
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if sErr != errUnformattedDisk && sErr != errDiskNotFound && retryCount >= 5 {
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if sErr != nil {
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logger.Info("Unable to read 'format.json' from %s: %v\n", endpoints[i], sErr)
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}
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}
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}
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// Pre-emptively check if one of the formatted disks
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// is invalid. This function returns success for the
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// most part unless one of the formats is not consistent
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// with expected Erasure format. For example if a user is
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// trying to pool FS backend into an Erasure set.
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if err = checkFormatErasureValues(formatConfigs, setDriveCount); err != nil {
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return nil, nil, err
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}
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// All disks report unformatted we should initialized everyone.
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if shouldInitErasureDisks(sErrs) && firstDisk {
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logger.Info("Formatting %s zone, %v set(s), %v drives per set.",
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humanize.Ordinal(zoneCount), setCount, setDriveCount)
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// Initialize erasure code format on disks
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format, err = initFormatErasure(GlobalContext, storageDisks, setCount, setDriveCount, deploymentID, sErrs)
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if err != nil {
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return nil, nil, err
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}
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// Assign globalDeploymentID on first run for the
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// minio server managing the first disk
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globalDeploymentID = format.ID
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return storageDisks, format, nil
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}
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// Return error when quorum unformatted disks - indicating we are
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// waiting for first server to be online.
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if quorumUnformattedDisks(sErrs) && !firstDisk {
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return nil, nil, errNotFirstDisk
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}
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// Return error when quorum unformatted disks but waiting for rest
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// of the servers to be online.
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if quorumUnformattedDisks(sErrs) && firstDisk {
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return nil, nil, errFirstDiskWait
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}
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// Mark all root disks down
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markRootDisksAsDown(storageDisks, sErrs)
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// Following function is added to fix a regressions which was introduced
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// in release RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3.
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// This migration failed to capture '.This' field properly which indicates
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// the disk UUID association. Below function is called to handle and fix
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// this regression, for more info refer https://github.com/minio/minio/issues/5667
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if err = fixFormatErasureV3(storageDisks, endpoints, formatConfigs); err != nil {
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return nil, nil, err
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}
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// If any of the .This field is still empty, we return error.
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if formatErasureV3ThisEmpty(formatConfigs) {
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return nil, nil, errErasureV3ThisEmpty
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}
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format, err = getFormatErasureInQuorum(formatConfigs)
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if err != nil {
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return nil, nil, err
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}
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if format.ID == "" {
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// Not a first disk, wait until first disk fixes deploymentID
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if !firstDisk {
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return nil, nil, errNotFirstDisk
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}
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if err = formatErasureFixDeploymentID(endpoints, storageDisks, format); err != nil {
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return nil, nil, err
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}
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}
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globalDeploymentID = format.ID
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if err = formatErasureFixLocalDeploymentID(endpoints, storageDisks, format); err != nil {
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return nil, nil, err
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}
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// The will always recreate some directories inside .minio.sys of
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// the local disk such as tmp, multipart and background-ops
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initErasureMetaVolumesInLocalDisks(storageDisks, formatConfigs)
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return storageDisks, format, nil
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}
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// Format disks before initialization of object layer.
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func waitForFormatErasure(firstDisk bool, endpoints Endpoints, zoneCount, setCount, setDriveCount int, deploymentID string) ([]StorageAPI, *formatErasureV3, error) {
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if len(endpoints) == 0 || setCount == 0 || setDriveCount == 0 {
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return nil, nil, errInvalidArgument
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}
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if err := formatErasureMigrateLocalEndpoints(endpoints); err != nil {
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return nil, nil, err
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}
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if err := formatErasureCleanupTmpLocalEndpoints(endpoints); err != nil {
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return nil, nil, err
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}
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// prepare getElapsedTime() to calculate elapsed time since we started trying formatting disks.
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// All times are rounded to avoid showing milli, micro and nano seconds
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formatStartTime := time.Now().Round(time.Second)
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getElapsedTime := func() string {
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return time.Now().Round(time.Second).Sub(formatStartTime).String()
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}
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// Wait on each try for an update.
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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var tries int
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for {
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select {
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case <-ticker.C:
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storageDisks, format, err := connectLoadInitFormats(tries, firstDisk, endpoints, zoneCount, setCount, setDriveCount, deploymentID)
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if err != nil {
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tries++
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switch err {
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case errNotFirstDisk:
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// Fresh setup, wait for first server to be up.
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logger.Info("Waiting for the first server to format the disks.")
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continue
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case errFirstDiskWait:
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// Fresh setup, wait for other servers to come up.
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logger.Info("Waiting for all other servers to be online to format the disks.")
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continue
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case errErasureReadQuorum:
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// no quorum available continue to wait for minimum number of servers.
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logger.Info("Waiting for a minimum of %d disks to come online (elapsed %s)\n", len(endpoints)/2, getElapsedTime())
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continue
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case errErasureV3ThisEmpty:
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// need to wait for this error to be healed, so continue.
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continue
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default:
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// For all other unhandled errors we exit and fail.
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return nil, nil, err
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}
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}
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return storageDisks, format, nil
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case <-globalOSSignalCh:
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return nil, nil, fmt.Errorf("Initializing data volumes gracefully stopped")
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}
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}
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}
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