/
metacache-server-pool.go
824 lines (761 loc) · 22.3 KB
/
metacache-server-pool.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"context"
"errors"
"fmt"
"io"
"os"
pathutil "path"
"strings"
"sync"
"time"
"github.com/minio/minio/internal/bucket/lifecycle"
"github.com/minio/minio/internal/bucket/object/lock"
"github.com/minio/minio/internal/logger"
)
func renameAllBucketMetacache(epPath string) error {
// Rename all previous `.minio.sys/buckets/<bucketname>/.metacache` to
// to `.minio.sys/tmp/` for deletion.
return readDirFn(pathJoin(epPath, minioMetaBucket, bucketMetaPrefix), func(name string, typ os.FileMode) error {
if typ == os.ModeDir {
tmpMetacacheOld := pathutil.Join(epPath, minioMetaTmpDeletedBucket, mustGetUUID())
if err := renameAll(pathJoin(epPath, minioMetaBucket, metacachePrefixForID(name, slashSeparator)),
tmpMetacacheOld); err != nil && err != errFileNotFound {
return fmt.Errorf("unable to rename (%s -> %s) %w",
pathJoin(epPath, minioMetaBucket+metacachePrefixForID(minioMetaBucket, slashSeparator)),
tmpMetacacheOld,
osErrToFileErr(err))
}
}
return nil
})
}
// listPath will return the requested entries.
// If no more entries are in the listing io.EOF is returned,
// otherwise nil or an unexpected error is returned.
// The listPathOptions given will be checked and modified internally.
// Required important fields are Bucket, Prefix, Separator.
// Other important fields are Limit, Marker.
// List ID always derived from the Marker.
func (z *erasureServerPools) listPath(ctx context.Context, o *listPathOptions) (entries metaCacheEntriesSorted, err error) {
if err := checkListObjsArgs(ctx, o.Bucket, o.Prefix, o.Marker, z); err != nil {
return entries, err
}
// Marker is set validate pre-condition.
if o.Marker != "" && o.Prefix != "" {
// Marker not common with prefix is not implemented. Send an empty response
if !HasPrefix(o.Marker, o.Prefix) {
return entries, io.EOF
}
}
// With max keys of zero we have reached eof, return right here.
if o.Limit == 0 {
return entries, io.EOF
}
// For delimiter and prefix as '/' we do not list anything at all
// along // with the prefix. On a flat namespace with 'prefix'
// as '/' we don't have any entries, since all the keys are
// of form 'keyName/...'
if strings.HasPrefix(o.Prefix, SlashSeparator) {
return entries, io.EOF
}
// If delimiter is slashSeparator we must return directories of
// the non-recursive scan unless explicitly requested.
o.IncludeDirectories = o.Separator == slashSeparator
if (o.Separator == slashSeparator || o.Separator == "") && !o.Recursive {
o.Recursive = o.Separator != slashSeparator
o.Separator = slashSeparator
} else {
// Default is recursive, if delimiter is set then list non recursive.
o.Recursive = true
}
// Decode and get the optional list id from the marker.
o.parseMarker()
o.BaseDir = baseDirFromPrefix(o.Prefix)
o.Transient = o.Transient || isReservedOrInvalidBucket(o.Bucket, false)
o.SetFilter()
if o.Transient {
o.Create = false
}
// We have 2 cases:
// 1) Cold listing, just list.
// 2) Returning, but with no id. Start async listing.
// 3) Returning, with ID, stream from list.
//
// If we don't have a list id we must ask the server if it has a cache or create a new.
if o.ID != "" && !o.Transient {
// Create or ping with handout...
rpc := globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix))
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
var c *metacache
if rpc == nil {
resp := localMetacacheMgr.getBucket(ctx, o.Bucket).findCache(*o)
c = &resp
} else {
c, err = rpc.GetMetacacheListing(ctx, *o)
}
if err != nil {
if errors.Is(err, context.Canceled) {
// Context is canceled, return at once.
// request canceled, no entries to return
return entries, io.EOF
}
if !errors.Is(err, context.DeadlineExceeded) {
o.debugln("listPath: got error", err)
}
o.Transient = true
o.Create = false
o.ID = mustGetUUID()
} else {
if c.fileNotFound {
// No cache found, no entries found.
return entries, io.EOF
}
if c.status == scanStateError || c.status == scanStateNone {
o.ID = ""
o.Create = false
o.debugln("scan status", c.status, " - waiting a roundtrip to create")
} else {
// Continue listing
o.ID = c.id
go func(meta metacache) {
// Continuously update while we wait.
t := time.NewTicker(metacacheMaxClientWait / 10)
defer t.Stop()
select {
case <-ctx.Done():
// Request is done, stop updating.
return
case <-t.C:
meta.lastHandout = time.Now()
if rpc == nil {
meta, _ = localMetacacheMgr.updateCacheEntry(meta)
}
meta, _ = rpc.UpdateMetacacheListing(ctx, meta)
}
}(*c)
}
}
}
if o.ID != "" && !o.Transient {
// We have an existing list ID, continue streaming.
if o.Create {
o.debugln("Creating", o)
entries, err = z.listAndSave(ctx, o)
if err == nil || err == io.EOF {
return entries, err
}
entries.truncate(0)
} else {
if o.pool < len(z.serverPools) && o.set < len(z.serverPools[o.pool].sets) {
o.debugln("Resuming", o)
entries, err = z.serverPools[o.pool].sets[o.set].streamMetadataParts(ctx, *o)
entries.reuse = true // We read from stream and are not sharing results.
if err == nil {
return entries, nil
}
} else {
err = fmt.Errorf("invalid pool/set")
o.pool, o.set = 0, 0
}
}
if IsErr(err, []error{
nil,
context.Canceled,
context.DeadlineExceeded,
// io.EOF is expected and should be returned but no need to log it.
io.EOF,
}...) {
// Expected good errors we don't need to return error.
return entries, err
}
entries.truncate(0)
go func() {
rpc := globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix))
if rpc != nil {
ctx, cancel := context.WithTimeout(GlobalContext, 5*time.Second)
defer cancel()
c, err := rpc.GetMetacacheListing(ctx, *o)
if err == nil {
c.error = "no longer used"
c.status = scanStateError
rpc.UpdateMetacacheListing(ctx, *c)
}
}
}()
o.ID = ""
if err != nil {
logger.LogIf(ctx, fmt.Errorf("Resuming listing from drives failed %w, proceeding to do raw listing", err))
}
}
// Do listing in-place.
// Create output for our results.
// Create filter for results.
o.debugln("Raw List", o)
filterCh := make(chan metaCacheEntry, o.Limit)
listCtx, cancelList := context.WithCancel(ctx)
filteredResults := o.gatherResults(listCtx, filterCh)
var wg sync.WaitGroup
wg.Add(1)
var listErr error
go func(o listPathOptions) {
defer wg.Done()
o.Limit = 0
listErr = z.listMerged(listCtx, o, filterCh)
o.debugln("listMerged returned with", listErr)
}(*o)
entries, err = filteredResults()
cancelList()
wg.Wait()
if listErr != nil && !errors.Is(listErr, context.Canceled) {
return entries, listErr
}
entries.reuse = true
truncated := entries.len() > o.Limit || err == nil
entries.truncate(o.Limit)
if !o.Transient && truncated {
if o.ID == "" {
entries.listID = mustGetUUID()
} else {
entries.listID = o.ID
}
}
if !truncated {
return entries, io.EOF
}
return entries, nil
}
// listPath will return the requested entries.
// If no more entries are in the listing io.EOF is returned,
// otherwise nil or an unexpected error is returned.
// The listPathOptions given will be checked and modified internally.
// Required important fields are Bucket, Prefix, Separator.
// Other important fields are Limit, Marker.
// List ID always derived from the Marker.
func (es *erasureSingle) listPath(ctx context.Context, o *listPathOptions) (entries metaCacheEntriesSorted, err error) {
if err := checkListObjsArgs(ctx, o.Bucket, o.Prefix, o.Marker, es); err != nil {
return entries, err
}
// Marker is set validate pre-condition.
if o.Marker != "" && o.Prefix != "" {
// Marker not common with prefix is not implemented. Send an empty response
if !HasPrefix(o.Marker, o.Prefix) {
return entries, io.EOF
}
}
// With max keys of zero we have reached eof, return right here.
if o.Limit == 0 {
return entries, io.EOF
}
// For delimiter and prefix as '/' we do not list anything at all
// along // with the prefix. On a flat namespace with 'prefix'
// as '/' we don't have any entries, since all the keys are
// of form 'keyName/...'
if strings.HasPrefix(o.Prefix, SlashSeparator) {
return entries, io.EOF
}
// If delimiter is slashSeparator we must return directories of
// the non-recursive scan unless explicitly requested.
o.IncludeDirectories = o.Separator == slashSeparator
if (o.Separator == slashSeparator || o.Separator == "") && !o.Recursive {
o.Recursive = o.Separator != slashSeparator
o.Separator = slashSeparator
} else {
// Default is recursive, if delimiter is set then list non recursive.
o.Recursive = true
}
// Decode and get the optional list id from the marker.
o.parseMarker()
o.BaseDir = baseDirFromPrefix(o.Prefix)
o.Transient = o.Transient || isReservedOrInvalidBucket(o.Bucket, false)
o.SetFilter()
if o.Transient {
o.Create = false
}
// We have 2 cases:
// 1) Cold listing, just list.
// 2) Returning, but with no id. Start async listing.
// 3) Returning, with ID, stream from list.
//
// If we don't have a list id we must ask the server if it has a cache or create a new.
if o.ID != "" && !o.Transient {
// Create or ping with handout...
rpc := globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix))
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
var c *metacache
if rpc == nil {
resp := localMetacacheMgr.getBucket(ctx, o.Bucket).findCache(*o)
c = &resp
} else {
c, err = rpc.GetMetacacheListing(ctx, *o)
}
if err != nil {
if errors.Is(err, context.Canceled) {
// Context is canceled, return at once.
// request canceled, no entries to return
return entries, io.EOF
}
if !errors.Is(err, context.DeadlineExceeded) {
o.debugln("listPath: got error", err)
}
o.Transient = true
o.Create = false
o.ID = mustGetUUID()
} else {
if c.fileNotFound {
// No cache found, no entries found.
return entries, io.EOF
}
if c.status == scanStateError || c.status == scanStateNone {
o.ID = ""
o.Create = false
o.debugln("scan status", c.status, " - waiting a roundtrip to create")
} else {
// Continue listing
o.ID = c.id
go func(meta metacache) {
// Continuously update while we wait.
t := time.NewTicker(metacacheMaxClientWait / 10)
defer t.Stop()
select {
case <-ctx.Done():
// Request is done, stop updating.
return
case <-t.C:
meta.lastHandout = time.Now()
if rpc == nil {
meta, _ = localMetacacheMgr.updateCacheEntry(meta)
}
meta, _ = rpc.UpdateMetacacheListing(ctx, meta)
}
}(*c)
}
}
// We have an existing list ID, continue streaming.
if o.Create {
o.debugln("Creating", o)
entries, err = es.listAndSave(ctx, o)
if err == nil || err == io.EOF {
return entries, err
}
entries.truncate(0)
} else {
o.debugln("Resuming", o)
entries, err = es.streamMetadataParts(ctx, *o)
entries.reuse = true // We read from stream and are not sharing results.
if err == nil {
return entries, nil
}
}
if IsErr(err, []error{
nil,
context.Canceled,
context.DeadlineExceeded,
// io.EOF is expected and should be returned but no need to log it.
io.EOF,
}...) {
// Expected good errors we don't need to return error.
return entries, err
}
entries.truncate(0)
go func() {
rpc := globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix))
if rpc != nil {
ctx, cancel := context.WithTimeout(GlobalContext, 5*time.Second)
defer cancel()
c, err := rpc.GetMetacacheListing(ctx, *o)
if err == nil {
c.error = "no longer used"
c.status = scanStateError
rpc.UpdateMetacacheListing(ctx, *c)
}
}
}()
o.ID = ""
if err != nil {
logger.LogIf(ctx, fmt.Errorf("Resuming listing from drives failed %w, proceeding to do raw listing", err))
}
}
// Do listing in-place.
// Create output for our results.
// Create filter for results.
o.debugln("Raw List", o)
filterCh := make(chan metaCacheEntry, o.Limit)
listCtx, cancelList := context.WithCancel(ctx)
filteredResults := o.gatherResults(listCtx, filterCh)
var wg sync.WaitGroup
wg.Add(1)
var listErr error
go func(o listPathOptions) {
defer wg.Done()
o.Limit = 0
listErr = es.listMerged(listCtx, o, filterCh)
o.debugln("listMerged returned with", listErr)
}(*o)
entries, err = filteredResults()
cancelList()
wg.Wait()
if listErr != nil && !errors.Is(listErr, context.Canceled) {
return entries, listErr
}
entries.reuse = true
truncated := entries.len() > o.Limit || err == nil
entries.truncate(o.Limit)
if !o.Transient && truncated {
if o.ID == "" {
entries.listID = mustGetUUID()
} else {
entries.listID = o.ID
}
}
if !truncated {
return entries, io.EOF
}
return entries, nil
}
// listMerged will list across all sets and return a merged results stream.
// The result channel is closed when no more results are expected.
func (es *erasureSingle) listMerged(ctx context.Context, o listPathOptions, results chan<- metaCacheEntry) error {
var mu sync.Mutex
var wg sync.WaitGroup
var listErr error
var inputs []chan metaCacheEntry
innerResults := make(chan metaCacheEntry, 100)
inputs = append(inputs, innerResults)
mu.Lock()
listCtx, cancelList := context.WithCancel(ctx)
defer cancelList()
wg.Add(1)
go func() {
defer wg.Done()
err := es.listPathInner(listCtx, o, innerResults)
mu.Lock()
defer mu.Unlock()
listErr = err
}()
mu.Unlock()
// Do lifecycle filtering.
if o.Lifecycle != nil {
filterIn := make(chan metaCacheEntry, 10)
go filterLifeCycle(ctx, o.Bucket, *o.Lifecycle, o.Retention, filterIn, results)
// Replace results.
results = filterIn
}
// Gather results to a single channel.
err := mergeEntryChannels(ctx, inputs, results, func(existing, other *metaCacheEntry) (replace bool) {
// Pick object over directory
if existing.isDir() && !other.isDir() {
return true
}
if !existing.isDir() && other.isDir() {
return false
}
eMeta, err := existing.xlmeta()
if err != nil {
return true
}
oMeta, err := other.xlmeta()
if err != nil {
return false
}
// Replace if modtime is newer
if !oMeta.latestModtime().Equal(oMeta.latestModtime()) {
return oMeta.latestModtime().After(eMeta.latestModtime())
}
// Use NumVersions as a final tiebreaker.
return len(oMeta.versions) > len(eMeta.versions)
})
cancelList()
wg.Wait()
if err != nil {
return err
}
if listErr != nil {
if contextCanceled(ctx) {
return nil
}
if listErr.Error() == io.EOF.Error() {
return nil
}
logger.LogIf(ctx, listErr)
return listErr
}
if contextCanceled(ctx) {
return ctx.Err()
}
return nil
}
// listMerged will list across all sets and return a merged results stream.
// The result channel is closed when no more results are expected.
func (z *erasureServerPools) listMerged(ctx context.Context, o listPathOptions, results chan<- metaCacheEntry) error {
var mu sync.Mutex
var wg sync.WaitGroup
var errs []error
allAtEOF := true
var inputs []chan metaCacheEntry
mu.Lock()
// Ask all sets and merge entries.
listCtx, cancelList := context.WithCancel(ctx)
defer cancelList()
for _, pool := range z.serverPools {
for _, set := range pool.sets {
wg.Add(1)
innerResults := make(chan metaCacheEntry, 100)
inputs = append(inputs, innerResults)
go func(i int, set *erasureObjects) {
defer wg.Done()
err := set.listPath(listCtx, o, innerResults)
mu.Lock()
defer mu.Unlock()
if err == nil {
allAtEOF = false
}
errs[i] = err
}(len(errs), set)
errs = append(errs, nil)
}
}
mu.Unlock()
// Do lifecycle filtering.
if o.Lifecycle != nil {
filterIn := make(chan metaCacheEntry, 10)
go filterLifeCycle(ctx, o.Bucket, *o.Lifecycle, o.Retention, filterIn, results)
// Replace results.
results = filterIn
}
// Gather results to a single channel.
err := mergeEntryChannels(ctx, inputs, results, func(existing, other *metaCacheEntry) (replace bool) {
// Pick object over directory
if existing.isDir() && !other.isDir() {
return true
}
if !existing.isDir() && other.isDir() {
return false
}
eMeta, err := existing.xlmeta()
if err != nil {
return true
}
oMeta, err := other.xlmeta()
if err != nil {
return false
}
// Replace if modtime is newer
if !oMeta.latestModtime().Equal(oMeta.latestModtime()) {
return oMeta.latestModtime().After(eMeta.latestModtime())
}
// Use NumVersions as a final tiebreaker.
return len(oMeta.versions) > len(eMeta.versions)
})
cancelList()
wg.Wait()
if err != nil {
return err
}
if contextCanceled(ctx) {
return ctx.Err()
}
if isAllNotFound(errs) {
return nil
}
for _, err := range errs {
if err == nil || contextCanceled(ctx) {
allAtEOF = false
continue
}
if err.Error() == io.EOF.Error() {
continue
}
logger.LogIf(ctx, err)
return err
}
if allAtEOF {
// TODO" Maybe, maybe not
return io.EOF
}
return nil
}
// filterLifeCycle will filter out objects if the most recent
// version should be deleted by lifecycle.
// out will be closed when there are no more results.
// When 'in' is closed or the context is canceled the
// function closes 'out' and exits.
func filterLifeCycle(ctx context.Context, bucket string, lc lifecycle.Lifecycle, lr lock.Retention, in <-chan metaCacheEntry, out chan<- metaCacheEntry) {
defer close(out)
vcfg, _ := globalBucketVersioningSys.Get(bucket)
for {
var obj metaCacheEntry
var ok bool
select {
case <-ctx.Done():
return
case obj, ok = <-in:
if !ok {
return
}
}
fi, err := obj.fileInfo(bucket)
if err != nil {
continue
}
versioned := vcfg != nil && vcfg.Versioned(obj.name)
objInfo := fi.ToObjectInfo(bucket, obj.name, versioned)
action := evalActionFromLifecycle(ctx, lc, lr, objInfo, false)
switch action {
case lifecycle.DeleteVersionAction, lifecycle.DeleteAction:
fallthrough
case lifecycle.DeleteRestoredAction, lifecycle.DeleteRestoredVersionAction:
// Skip this entry.
continue
}
select {
case <-ctx.Done():
return
case out <- obj:
}
}
}
func (es *erasureSingle) listAndSave(ctx context.Context, o *listPathOptions) (entries metaCacheEntriesSorted, err error) {
// Use ID as the object name...
o.pool = 0
o.set = 0
saver := es
// Disconnect from call above, but cancel on exit.
listCtx, cancel := context.WithCancel(GlobalContext)
saveCh := make(chan metaCacheEntry, metacacheBlockSize)
inCh := make(chan metaCacheEntry, metacacheBlockSize)
outCh := make(chan metaCacheEntry, o.Limit)
filteredResults := o.gatherResults(ctx, outCh)
mc := o.newMetacache()
meta := metaCacheRPC{meta: &mc, cancel: cancel, rpc: globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix)), o: *o}
// Save listing...
go func() {
if err := saver.saveMetaCacheStream(listCtx, &meta, saveCh); err != nil {
meta.setErr(err.Error())
}
cancel()
}()
// Do listing...
go func(o listPathOptions) {
err := es.listMerged(listCtx, o, inCh)
if err != nil {
meta.setErr(err.Error())
}
o.debugln("listAndSave: listing", o.ID, "finished with ", err)
}(*o)
// Keep track of when we return since we no longer have to send entries to output.
var funcReturned bool
var funcReturnedMu sync.Mutex
defer func() {
funcReturnedMu.Lock()
funcReturned = true
funcReturnedMu.Unlock()
}()
// Write listing to results and saver.
go func() {
var returned bool
for entry := range inCh {
if !returned {
funcReturnedMu.Lock()
returned = funcReturned
funcReturnedMu.Unlock()
outCh <- entry
if returned {
close(outCh)
}
}
entry.reusable = returned
saveCh <- entry
}
if !returned {
close(outCh)
}
close(saveCh)
}()
return filteredResults()
}
func (z *erasureServerPools) listAndSave(ctx context.Context, o *listPathOptions) (entries metaCacheEntriesSorted, err error) {
// Use ID as the object name...
o.pool = z.getAvailablePoolIdx(ctx, minioMetaBucket, o.ID, 10<<20)
if o.pool < 0 {
// No space or similar, don't persist the listing.
o.pool = 0
o.Create = false
o.ID = ""
o.Transient = true
return entries, errDiskFull
}
o.set = z.serverPools[o.pool].getHashedSetIndex(o.ID)
saver := z.serverPools[o.pool].sets[o.set]
// Disconnect from call above, but cancel on exit.
listCtx, cancel := context.WithCancel(GlobalContext)
saveCh := make(chan metaCacheEntry, metacacheBlockSize)
inCh := make(chan metaCacheEntry, metacacheBlockSize)
outCh := make(chan metaCacheEntry, o.Limit)
filteredResults := o.gatherResults(ctx, outCh)
mc := o.newMetacache()
meta := metaCacheRPC{meta: &mc, cancel: cancel, rpc: globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix)), o: *o}
// Save listing...
go func() {
if err := saver.saveMetaCacheStream(listCtx, &meta, saveCh); err != nil {
meta.setErr(err.Error())
}
cancel()
}()
// Do listing...
go func(o listPathOptions) {
err := z.listMerged(listCtx, o, inCh)
if err != nil {
meta.setErr(err.Error())
}
o.debugln("listAndSave: listing", o.ID, "finished with ", err)
}(*o)
// Keep track of when we return since we no longer have to send entries to output.
var funcReturned bool
var funcReturnedMu sync.Mutex
defer func() {
funcReturnedMu.Lock()
funcReturned = true
funcReturnedMu.Unlock()
}()
// Write listing to results and saver.
go func() {
var returned bool
for entry := range inCh {
if !returned {
funcReturnedMu.Lock()
returned = funcReturned
funcReturnedMu.Unlock()
outCh <- entry
if returned {
close(outCh)
}
}
entry.reusable = returned
saveCh <- entry
}
if !returned {
close(outCh)
}
close(saveCh)
}()
return filteredResults()
}