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404 lines
13 KiB
404 lines
13 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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"context"
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"crypto/tls"
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"errors"
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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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"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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err := formatErasureMigrate(epPath)
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if err != nil && !errors.Is(err, os.ErrNotExist) {
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return 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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// 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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// 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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// Move .minio.sys/buckets/.minio.sys/metacache transient list cache
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// folder to speed up startup routines.
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tmpMetacacheOld := pathJoin(epPath, minioMetaTmpBucket+"-old", mustGetUUID())
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if err := renameAll(pathJoin(epPath, minioMetaBucket, metacachePrefixForID(minioMetaBucket, "")),
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tmpMetacacheOld); err != nil && err != errFileNotFound {
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return fmt.Errorf("unable to rename (%s -> %s) %w",
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pathJoin(epPath, minioMetaBucket+metacachePrefixForID(minioMetaBucket, "")),
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tmpMetacacheOld,
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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: pathJoin(healthCheckPathPrefix, healthCheckLivenessPath),
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}
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var tlsConfig *tls.Config
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if globalIsTLS {
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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: 3 * time.Second,
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TLSHandshakeTimeout: 3 * time.Second,
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ExpectContinueTimeout: 3 * 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, 3*time.Second)
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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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cancel()
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return err
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}
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resp, err := httpClient.Do(req)
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cancel()
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if err != nil {
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return err
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}
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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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if resp.Header.Get(xhttp.MinIOServerStatus) == unavailable {
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return StorageErr(unavailable)
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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, poolCount, 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 pool, %v set(s), %v drives per set.",
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humanize.Ordinal(poolCount), 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, poolCount, 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, poolCount, 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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