35e4a87e60
work Since we have changed the repair worker to also mark a node as audit failure if they return a not found error, we should ignore expired segments when possible Change-Id: Ie6a677e1d7b234e93965c736d05950440236653c
534 lines
19 KiB
Go
534 lines
19 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package repairer
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import (
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"context"
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"errors"
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"fmt"
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"math"
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"time"
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"github.com/zeebo/errs"
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"go.uber.org/zap"
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"storj.io/common/pb"
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"storj.io/common/storj"
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"storj.io/storj/satellite/audit"
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"storj.io/storj/satellite/metabase"
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"storj.io/storj/satellite/orders"
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"storj.io/storj/satellite/overlay"
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"storj.io/storj/satellite/repair/checker"
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"storj.io/storj/satellite/repair/queue"
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"storj.io/uplink/private/eestream"
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)
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var (
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metainfoGetError = errs.Class("metainfo db get")
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metainfoPutError = errs.Class("metainfo db put")
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invalidRepairError = errs.Class("invalid repair")
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overlayQueryError = errs.Class("overlay query failure")
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orderLimitFailureError = errs.Class("order limits failure")
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repairReconstructError = errs.Class("repair reconstruction failure")
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repairPutError = errs.Class("repair could not store repaired pieces")
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// segmentVerificationError is the errs class when the repaired segment can not be verified during repair.
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segmentVerificationError = errs.Class("segment verification failed")
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// segmentDeletedError is the errs class when the repaired segment was deleted during the repair.
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segmentDeletedError = errs.Class("segment deleted during repair")
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// segmentModifiedError is the errs class used when a segment has been changed in any way.
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segmentModifiedError = errs.Class("segment has been modified")
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)
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// irreparableError identifies situations where a segment could not be repaired due to reasons
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// which are hopefully transient (e.g. too many pieces unavailable). The segment should be added
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// to the irreparableDB.
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type irreparableError struct {
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piecesAvailable int32
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piecesRequired int32
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errlist []error
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}
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func (ie *irreparableError) Error() string {
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return fmt.Sprintf("%d available pieces < %d required", ie.piecesAvailable, ie.piecesRequired)
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}
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// SegmentRepairer for segments.
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type SegmentRepairer struct {
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log *zap.Logger
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statsCollector *statsCollector
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metabase *metabase.DB
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orders *orders.Service
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overlay *overlay.Service
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ec *ECRepairer
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timeout time.Duration
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reporter *audit.Reporter
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// multiplierOptimalThreshold is the value that multiplied by the optimal
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// threshold results in the maximum limit of number of nodes to upload
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// repaired pieces
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multiplierOptimalThreshold float64
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// repairOverrides is the set of values configured by the checker to override the repair threshold for various RS schemes.
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repairOverrides checker.RepairOverridesMap
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nowFn func() time.Time
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OnTestingCheckSegmentAlteredHook func()
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OnTestingPiecesReportHook func(pieces audit.Pieces)
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}
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// NewSegmentRepairer creates a new instance of SegmentRepairer.
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//
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// excessPercentageOptimalThreshold is the percentage to apply over the optimal
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// threshould to determine the maximum limit of nodes to upload repaired pieces,
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// when negative, 0 is applied.
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func NewSegmentRepairer(
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log *zap.Logger,
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metabase *metabase.DB,
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orders *orders.Service,
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overlay *overlay.Service,
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reporter *audit.Reporter,
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ecRepairer *ECRepairer,
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repairOverrides checker.RepairOverrides,
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timeout time.Duration, excessOptimalThreshold float64,
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) *SegmentRepairer {
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if excessOptimalThreshold < 0 {
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excessOptimalThreshold = 0
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}
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return &SegmentRepairer{
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log: log,
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statsCollector: newStatsCollector(),
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metabase: metabase,
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orders: orders,
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overlay: overlay,
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ec: ecRepairer,
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timeout: timeout,
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multiplierOptimalThreshold: 1 + excessOptimalThreshold,
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repairOverrides: repairOverrides.GetMap(),
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reporter: reporter,
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nowFn: time.Now,
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}
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}
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// Repair retrieves an at-risk segment and repairs and stores lost pieces on new nodes
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// note that shouldDelete is used even in the case where err is not null
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// note that it will update audit status as failed for nodes that failed piece hash verification during repair downloading.
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func (repairer *SegmentRepairer) Repair(ctx context.Context, queueSegment *queue.InjuredSegment) (shouldDelete bool, err error) {
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defer mon.Task()(&ctx, queueSegment.StreamID.String(), queueSegment.Position.Encode())(&err)
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segment, err := repairer.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
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StreamID: queueSegment.StreamID,
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Position: queueSegment.Position,
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})
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if err != nil {
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if metabase.ErrSegmentNotFound.Has(err) {
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mon.Meter("repair_unnecessary").Mark(1) //mon:locked
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mon.Meter("segment_deleted_before_repair").Mark(1) //mon:locked
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repairer.log.Debug("segment was deleted")
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return true, nil
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}
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return false, metainfoGetError.Wrap(err)
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}
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if segment.Inline() {
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return true, invalidRepairError.New("cannot repair inline segment")
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}
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// ignore segment if expired
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if segment.Expired(repairer.nowFn()) {
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repairer.log.Debug("segment has expired", zap.Stringer("Stream ID", segment.StreamID), zap.Uint64("Position", queueSegment.Position.Encode()))
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return true, nil
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}
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redundancy, err := eestream.NewRedundancyStrategyFromStorj(segment.Redundancy)
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if err != nil {
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return true, invalidRepairError.New("invalid redundancy strategy: %w", err)
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}
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stats := repairer.getStatsByRS(&pb.RedundancyScheme{
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Type: pb.RedundancyScheme_SchemeType(segment.Redundancy.Algorithm),
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ErasureShareSize: segment.Redundancy.ShareSize,
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MinReq: int32(segment.Redundancy.RequiredShares),
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RepairThreshold: int32(segment.Redundancy.RepairShares),
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SuccessThreshold: int32(segment.Redundancy.OptimalShares),
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Total: int32(segment.Redundancy.TotalShares),
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})
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mon.Meter("repair_attempts").Mark(1) //mon:locked
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stats.repairAttempts.Mark(1)
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mon.IntVal("repair_segment_size").Observe(int64(segment.EncryptedSize)) //mon:locked
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stats.repairSegmentSize.Observe(int64(segment.EncryptedSize))
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var excludeNodeIDs storj.NodeIDList
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pieces := segment.Pieces
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missingPieces, err := repairer.overlay.GetMissingPieces(ctx, pieces)
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if err != nil {
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return false, overlayQueryError.New("error identifying missing pieces: %w", err)
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}
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numHealthy := len(pieces) - len(missingPieces)
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// irreparable piece
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if numHealthy < int(segment.Redundancy.RequiredShares) {
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mon.Counter("repairer_segments_below_min_req").Inc(1) //mon:locked
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stats.repairerSegmentsBelowMinReq.Inc(1)
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mon.Meter("repair_nodes_unavailable").Mark(1) //mon:locked
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stats.repairerNodesUnavailable.Mark(1)
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repairer.log.Warn("irreparable segment",
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zap.String("StreamID", queueSegment.StreamID.String()),
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zap.Uint64("Position", queueSegment.Position.Encode()),
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zap.Int("piecesAvailable", numHealthy),
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zap.Int16("piecesRequired", segment.Redundancy.RequiredShares),
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)
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return false, nil
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}
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// ensure we get values, even if only zero values, so that redash can have an alert based on this
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mon.Counter("repairer_segments_below_min_req").Inc(0) //mon:locked
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stats.repairerSegmentsBelowMinReq.Inc(0)
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repairThreshold := int32(segment.Redundancy.RepairShares)
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pbRedundancy := &pb.RedundancyScheme{
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MinReq: int32(segment.Redundancy.RequiredShares),
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RepairThreshold: int32(segment.Redundancy.RepairShares),
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SuccessThreshold: int32(segment.Redundancy.OptimalShares),
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Total: int32(segment.Redundancy.TotalShares),
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}
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overrideValue := repairer.repairOverrides.GetOverrideValuePB(pbRedundancy)
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if overrideValue != 0 {
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repairThreshold = overrideValue
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}
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// repair not needed
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if numHealthy > int(repairThreshold) {
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mon.Meter("repair_unnecessary").Mark(1) //mon:locked
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stats.repairUnnecessary.Mark(1)
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repairer.log.Debug("segment above repair threshold", zap.Int("numHealthy", numHealthy), zap.Int32("repairThreshold", repairThreshold))
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return true, nil
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}
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healthyRatioBeforeRepair := 0.0
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if segment.Redundancy.TotalShares != 0 {
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healthyRatioBeforeRepair = float64(numHealthy) / float64(segment.Redundancy.TotalShares)
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}
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mon.FloatVal("healthy_ratio_before_repair").Observe(healthyRatioBeforeRepair) //mon:locked
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stats.healthyRatioBeforeRepair.Observe(healthyRatioBeforeRepair)
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lostPiecesSet := sliceToSet(missingPieces)
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var healthyPieces, unhealthyPieces metabase.Pieces
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healthyMap := make(map[uint16]bool)
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// Populate healthyPieces with all pieces from the segment except those correlating to indices in lostPieces
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for _, piece := range pieces {
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excludeNodeIDs = append(excludeNodeIDs, piece.StorageNode)
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if !lostPiecesSet[piece.Number] {
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healthyPieces = append(healthyPieces, piece)
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healthyMap[piece.Number] = true
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} else {
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unhealthyPieces = append(unhealthyPieces, piece)
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}
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}
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// Create the order limits for the GET_REPAIR action
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getOrderLimits, getPrivateKey, cachedIPsAndPorts, err := repairer.orders.CreateGetRepairOrderLimits(ctx, metabase.BucketLocation{}, segment, healthyPieces)
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if err != nil {
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if orders.ErrDownloadFailedNotEnoughPieces.Has(err) {
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mon.Counter("repairer_segments_below_min_req").Inc(1) //mon:locked
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stats.repairerSegmentsBelowMinReq.Inc(1)
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mon.Meter("repair_nodes_unavailable").Mark(1) //mon:locked
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stats.repairerNodesUnavailable.Mark(1)
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repairer.log.Warn("irreparable segment",
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zap.String("StreamID", queueSegment.StreamID.String()),
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zap.Uint64("Position", queueSegment.Position.Encode()),
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zap.Error(err),
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)
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}
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return false, orderLimitFailureError.New("could not create GET_REPAIR order limits: %w", err)
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}
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// Double check for healthy pieces which became unhealthy inside CreateGetRepairOrderLimits
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// Remove them from healthyPieces and add them to unhealthyPieces
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var newHealthyPieces metabase.Pieces
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for _, piece := range healthyPieces {
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if getOrderLimits[piece.Number] == nil {
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unhealthyPieces = append(unhealthyPieces, piece)
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} else {
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newHealthyPieces = append(newHealthyPieces, piece)
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}
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}
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healthyPieces = newHealthyPieces
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var requestCount int
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var minSuccessfulNeeded int
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{
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totalNeeded := math.Ceil(float64(redundancy.OptimalThreshold()) * repairer.multiplierOptimalThreshold)
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requestCount = int(totalNeeded) - len(healthyPieces)
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minSuccessfulNeeded = redundancy.OptimalThreshold() - len(healthyPieces)
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}
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// Request Overlay for n-h new storage nodes
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request := overlay.FindStorageNodesRequest{
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RequestedCount: requestCount,
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ExcludedIDs: excludeNodeIDs,
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}
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newNodes, err := repairer.overlay.FindStorageNodesForUpload(ctx, request)
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if err != nil {
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return false, overlayQueryError.Wrap(err)
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}
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// Create the order limits for the PUT_REPAIR action
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putLimits, putPrivateKey, err := repairer.orders.CreatePutRepairOrderLimits(ctx, metabase.BucketLocation{}, segment, getOrderLimits, newNodes, repairer.multiplierOptimalThreshold)
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if err != nil {
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return false, orderLimitFailureError.New("could not create PUT_REPAIR order limits: %w", err)
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}
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// Download the segment using just the healthy pieces
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segmentReader, piecesReport, err := repairer.ec.Get(ctx, getOrderLimits, cachedIPsAndPorts, getPrivateKey, redundancy, int64(segment.EncryptedSize))
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// ensure we get values, even if only zero values, so that redash can have an alert based on this
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mon.Meter("repair_too_many_nodes_failed").Mark(0) //mon:locked
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stats.repairTooManyNodesFailed.Mark(0)
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if repairer.OnTestingPiecesReportHook != nil {
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repairer.OnTestingPiecesReportHook(piecesReport)
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}
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// Check if segment has been altered
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checkSegmentError := repairer.checkIfSegmentAltered(ctx, segment)
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if checkSegmentError != nil {
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if segmentDeletedError.Has(checkSegmentError) {
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// mon.Meter("segment_deleted_during_repair").Mark(1) //mon:locked
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repairer.log.Debug("segment deleted during Repair")
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return true, nil
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}
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if segmentModifiedError.Has(checkSegmentError) {
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// mon.Meter("segment_modified_during_repair").Mark(1) //mon:locked
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repairer.log.Debug("segment modified during Repair")
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return true, nil
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}
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return false, segmentVerificationError.Wrap(checkSegmentError)
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}
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if len(piecesReport.Contained) > 0 {
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repairer.log.Debug("unexpected contained pieces during repair", zap.Int("count", len(piecesReport.Contained)))
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}
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var report audit.Report
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for _, piece := range piecesReport.Successful {
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report.Successes = append(report.Successes, piece.StorageNode)
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}
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for _, piece := range piecesReport.Failed {
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report.Fails = append(report.Fails, piece.StorageNode)
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}
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for _, piece := range piecesReport.Offline {
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report.Offlines = append(report.Offlines, piece.StorageNode)
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}
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for _, piece := range piecesReport.Unknown {
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report.Unknown = append(report.Unknown, piece.StorageNode)
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}
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_, reportErr := repairer.reporter.RecordAudits(ctx, report)
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if reportErr != nil {
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// failed updates should not affect repair, therefore we will not return the error
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repairer.log.Debug("failed to record audit", zap.Error(reportErr))
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}
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if err != nil {
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// If the context was closed during the Get phase, it will appear here as though
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// we just failed to download enough pieces to reconstruct the segment. Check for
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// a closed context before doing any further error processing.
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if ctxErr := ctx.Err(); ctxErr != nil {
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return false, ctxErr
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}
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// If Get failed because of input validation, then it will keep failing. But if it
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// gave us irreparableError, then we failed to download enough pieces and must try
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// to wait for nodes to come back online.
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var irreparableErr *irreparableError
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if errors.As(err, &irreparableErr) {
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mon.Meter("repair_too_many_nodes_failed").Mark(1) //mon:locked
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stats.repairTooManyNodesFailed.Mark(1)
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repairer.log.Warn("irreparable segment",
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zap.String("StreamID", queueSegment.StreamID.String()),
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zap.Uint64("Position", queueSegment.Position.Encode()),
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zap.Int32("piecesAvailable", irreparableErr.piecesAvailable),
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zap.Int32("piecesRequired", irreparableErr.piecesRequired),
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zap.Error(errs.Combine(irreparableErr.errlist...)),
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)
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return false, nil
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}
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// The segment's redundancy strategy is invalid, or else there was an internal error.
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return true, repairReconstructError.New("segment could not be reconstructed: %w", err)
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}
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defer func() { err = errs.Combine(err, segmentReader.Close()) }()
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// Upload the repaired pieces
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successfulNodes, _, err := repairer.ec.Repair(ctx, putLimits, putPrivateKey, redundancy, segmentReader, repairer.timeout, minSuccessfulNeeded)
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if err != nil {
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return false, repairPutError.Wrap(err)
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}
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pieceSize := eestream.CalcPieceSize(int64(segment.EncryptedSize), redundancy)
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var bytesRepaired int64
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// Add the successfully uploaded pieces to repairedPieces
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var repairedPieces metabase.Pieces
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repairedMap := make(map[uint16]bool)
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for i, node := range successfulNodes {
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if node == nil {
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continue
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}
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bytesRepaired += pieceSize
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piece := metabase.Piece{
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Number: uint16(i),
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StorageNode: node.Id,
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}
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repairedPieces = append(repairedPieces, piece)
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repairedMap[uint16(i)] = true
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}
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mon.Meter("repair_bytes_uploaded").Mark64(bytesRepaired) //mon:locked
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healthyAfterRepair := len(healthyPieces) + len(repairedPieces)
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switch {
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case healthyAfterRepair <= int(segment.Redundancy.RepairShares):
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// Important: this indicates a failure to PUT enough pieces to the network to pass
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// the repair threshold, and _not_ a failure to reconstruct the segment. But we
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// put at least one piece, else ec.Repair() would have returned an error. So the
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// repair "succeeded" in that the segment is now healthier than it was, but it is
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// not as healthy as we want it to be.
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mon.Meter("repair_failed").Mark(1) //mon:locked
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stats.repairFailed.Mark(1)
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case healthyAfterRepair < int(segment.Redundancy.OptimalShares):
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mon.Meter("repair_partial").Mark(1) //mon:locked
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stats.repairPartial.Mark(1)
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default:
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mon.Meter("repair_success").Mark(1) //mon:locked
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stats.repairSuccess.Mark(1)
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}
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healthyRatioAfterRepair := 0.0
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if segment.Redundancy.TotalShares != 0 {
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healthyRatioAfterRepair = float64(healthyAfterRepair) / float64(segment.Redundancy.TotalShares)
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}
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mon.FloatVal("healthy_ratio_after_repair").Observe(healthyRatioAfterRepair) //mon:locked
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stats.healthyRatioAfterRepair.Observe(healthyRatioAfterRepair)
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var toRemove metabase.Pieces
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if healthyAfterRepair >= int(segment.Redundancy.OptimalShares) {
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// if full repair, remove all unhealthy pieces
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toRemove = unhealthyPieces
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} else {
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// if partial repair, leave unrepaired unhealthy pieces in the pointer
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for _, piece := range unhealthyPieces {
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if repairedMap[piece.Number] {
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// add only repaired pieces in the slice, unrepaired
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// unhealthy pieces are not removed from the pointer
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toRemove = append(toRemove, piece)
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}
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}
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}
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// add pieces that failed piece hashes verification to the removal list
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toRemove = append(toRemove, piecesReport.Failed...)
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newPieces, err := segment.Pieces.Update(repairedPieces, toRemove)
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if err != nil {
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return false, repairPutError.Wrap(err)
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}
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err = repairer.metabase.UpdateSegmentPieces(ctx, metabase.UpdateSegmentPieces{
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StreamID: segment.StreamID,
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Position: segment.Position,
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OldPieces: segment.Pieces,
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NewRedundancy: segment.Redundancy,
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NewPieces: newPieces,
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NewRepairedAt: time.Now(),
|
|
})
|
|
if err != nil {
|
|
return false, metainfoPutError.Wrap(err)
|
|
}
|
|
|
|
repairedAt := time.Time{}
|
|
if segment.RepairedAt != nil {
|
|
repairedAt = *segment.RepairedAt
|
|
}
|
|
|
|
var segmentAge time.Duration
|
|
if segment.CreatedAt.Before(repairedAt) {
|
|
segmentAge = time.Since(repairedAt)
|
|
} else {
|
|
segmentAge = time.Since(segment.CreatedAt)
|
|
}
|
|
|
|
// TODO what to do with RepairCount
|
|
var repairCount int64
|
|
// pointer.RepairCount++
|
|
|
|
mon.IntVal("segment_time_until_repair").Observe(int64(segmentAge.Seconds())) //mon:locked
|
|
stats.segmentTimeUntilRepair.Observe(int64(segmentAge.Seconds()))
|
|
mon.IntVal("segment_repair_count").Observe(repairCount) //mon:locked
|
|
stats.segmentRepairCount.Observe(repairCount)
|
|
|
|
return true, nil
|
|
}
|
|
|
|
// checkIfSegmentAltered checks if oldSegment has been altered since it was selected for audit.
|
|
func (repairer *SegmentRepairer) checkIfSegmentAltered(ctx context.Context, oldSegment metabase.Segment) (err error) {
|
|
defer mon.Task()(&ctx)(&err)
|
|
|
|
if repairer.OnTestingCheckSegmentAlteredHook != nil {
|
|
repairer.OnTestingCheckSegmentAlteredHook()
|
|
}
|
|
|
|
newSegment, err := repairer.metabase.GetSegmentByPosition(ctx, metabase.GetSegmentByPosition{
|
|
StreamID: oldSegment.StreamID,
|
|
Position: oldSegment.Position,
|
|
})
|
|
if err != nil {
|
|
if metabase.ErrSegmentNotFound.Has(err) {
|
|
return segmentDeletedError.New("StreamID: %q Position: %d", oldSegment.StreamID.String(), oldSegment.Position.Encode())
|
|
}
|
|
return err
|
|
}
|
|
|
|
if !oldSegment.Pieces.Equal(newSegment.Pieces) {
|
|
return segmentModifiedError.New("StreamID: %q Position: %d", oldSegment.StreamID.String(), oldSegment.Position.Encode())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (repairer *SegmentRepairer) getStatsByRS(redundancy *pb.RedundancyScheme) *stats {
|
|
rsString := getRSString(repairer.loadRedundancy(redundancy))
|
|
return repairer.statsCollector.getStatsByRS(rsString)
|
|
}
|
|
|
|
func (repairer *SegmentRepairer) loadRedundancy(redundancy *pb.RedundancyScheme) (int, int, int, int) {
|
|
repair := int(redundancy.RepairThreshold)
|
|
overrideValue := repairer.repairOverrides.GetOverrideValuePB(redundancy)
|
|
if overrideValue != 0 {
|
|
repair = int(overrideValue)
|
|
}
|
|
return int(redundancy.MinReq), repair, int(redundancy.SuccessThreshold), int(redundancy.Total)
|
|
}
|
|
|
|
// SetNow allows tests to have the server act as if the current time is whatever they want.
|
|
func (repairer *SegmentRepairer) SetNow(nowFn func() time.Time) {
|
|
repairer.nowFn = nowFn
|
|
}
|
|
|
|
// sliceToSet converts the given slice to a set.
|
|
func sliceToSet(slice []uint16) map[uint16]bool {
|
|
set := make(map[uint16]bool, len(slice))
|
|
for _, value := range slice {
|
|
set[value] = true
|
|
}
|
|
return set
|
|
}
|