Fix EC shard recovery with improved diagnostics (#8091)
* storage: fix EC shard recovery with improved diagnostics and logging - Fix buffer size mismatch in ReconstructData call - Add detailed logging of available and missing shards - Improve error messages when recovery is impossible - Add unit tests for EC recovery shard counting logic * test: refine EC recovery unit tests - Remove redundant tests that only validate setup - Use standard strings.Contains instead of custom recursive helper * adjust tests and minor improvement
This commit is contained in:
Chris Lu
@@ -390,9 +390,32 @@ func (s *Store) recoverOneRemoteEcShardInterval(needleId types.NeedleId, ecVolum
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wg.Wait()
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if err = enc.ReconstructData(bufs); err != nil {
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glog.V(3).Infof("recovered ec shard %d.%d failed: %v", ecVolume.VolumeId, shardIdToRecover, err)
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return 0, false, err
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// Count and log available shards for diagnostics
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availableShards := make([]erasure_coding.ShardId, 0, erasure_coding.TotalShardsCount)
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missingShards := make([]erasure_coding.ShardId, 0, erasure_coding.ParityShardsCount+1)
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for shardId := 0; shardId < erasure_coding.TotalShardsCount; shardId++ {
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if bufs[shardId] != nil {
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availableShards = append(availableShards, erasure_coding.ShardId(shardId))
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} else {
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missingShards = append(missingShards, erasure_coding.ShardId(shardId))
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}
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}
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glog.V(3).Infof("recover ec shard %d.%d: %d shards available %v, %d missing %v",
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ecVolume.VolumeId, shardIdToRecover,
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len(availableShards), availableShards,
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len(missingShards), missingShards)
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if len(availableShards) < erasure_coding.DataShardsCount {
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return 0, false, fmt.Errorf("cannot recover shard %d.%d: only %d shards available %v, need at least %d (missing: %v)",
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ecVolume.VolumeId, shardIdToRecover,
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len(availableShards), availableShards,
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erasure_coding.DataShardsCount, missingShards)
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}
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if err = enc.ReconstructData(bufs[:erasure_coding.TotalShardsCount]); err != nil {
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return 0, false, fmt.Errorf("failed to reconstruct data for shard %d.%d with %d available shards %v: %w",
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ecVolume.VolumeId, shardIdToRecover, len(availableShards), availableShards, err)
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}
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glog.V(4).Infof("recovered ec shard %d.%d from other locations", ecVolume.VolumeId, shardIdToRecover)
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422
weed/storage/store_ec_recovery_test.go
Normal file
422
weed/storage/store_ec_recovery_test.go
Normal file
@@ -0,0 +1,422 @@
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package storage
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import (
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"fmt"
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"strings"
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"sync"
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"testing"
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"github.com/klauspost/reedsolomon"
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"github.com/seaweedfs/seaweedfs/weed/pb"
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"github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding"
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"github.com/seaweedfs/seaweedfs/weed/storage/needle"
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)
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// mockEcVolume creates a mock EC volume for testing
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func mockEcVolume(volumeId needle.VolumeId, shardLocations map[erasure_coding.ShardId][]pb.ServerAddress) *erasure_coding.EcVolume {
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ecVolume := &erasure_coding.EcVolume{
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VolumeId: volumeId,
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ShardLocations: shardLocations,
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}
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return ecVolume
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}
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// TestRecoverOneRemoteEcShardInterval_SufficientShards tests successful recovery with enough shards
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func TestRecoverOneRemoteEcShardInterval_SufficientShards(t *testing.T) {
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// This test simulates the improved diagnostics when there are sufficient shards
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// We can't easily test the full recovery without mocking the network calls,
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// but we can validate the logic for counting available shards
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shardIdToRecover := erasure_coding.ShardId(5)
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// Create shard locations with all shards except the one to recover
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shardLocations := make(map[erasure_coding.ShardId][]pb.ServerAddress)
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for i := 0; i < erasure_coding.TotalShardsCount; i++ {
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if i != int(shardIdToRecover) {
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shardLocations[erasure_coding.ShardId(i)] = []pb.ServerAddress{"localhost:8080"}
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}
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}
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// Verify we have enough shards for recovery
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availableCount := 0
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for shardId := 0; shardId < erasure_coding.TotalShardsCount; shardId++ {
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if shardId != int(shardIdToRecover) && len(shardLocations[erasure_coding.ShardId(shardId)]) > 0 {
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availableCount++
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}
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}
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if availableCount < erasure_coding.DataShardsCount {
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t.Errorf("Expected at least %d shards, got %d", erasure_coding.DataShardsCount, availableCount)
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}
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t.Logf("Successfully identified %d available shards (need %d)", availableCount, erasure_coding.DataShardsCount)
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}
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// TestRecoverOneRemoteEcShardInterval_InsufficientShards tests recovery failure with too few shards
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func TestRecoverOneRemoteEcShardInterval_InsufficientShards(t *testing.T) {
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shardIdToRecover := erasure_coding.ShardId(5)
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// Create shard locations with only 8 shards (less than DataShardsCount=10)
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shardLocations := make(map[erasure_coding.ShardId][]pb.ServerAddress)
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for i := 0; i < 8; i++ {
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if i != int(shardIdToRecover) {
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shardLocations[erasure_coding.ShardId(i)] = []pb.ServerAddress{"localhost:8080"}
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}
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}
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// Count available shards
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availableCount := 0
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for shardId := 0; shardId < erasure_coding.TotalShardsCount; shardId++ {
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if len(shardLocations[erasure_coding.ShardId(shardId)]) > 0 {
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availableCount++
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}
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}
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// Verify we don't have enough shards
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if availableCount >= erasure_coding.DataShardsCount {
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t.Errorf("Test setup error: expected less than %d shards, got %d", erasure_coding.DataShardsCount, availableCount)
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}
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t.Logf("Correctly identified insufficient shards: %d available (need %d)", availableCount, erasure_coding.DataShardsCount)
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}
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// TestRecoverOneRemoteEcShardInterval_ShardCounting tests the shard counting logic
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func TestRecoverOneRemoteEcShardInterval_ShardCounting(t *testing.T) {
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tests := []struct {
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name string
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totalShards int
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shardToRecover int
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expectSufficientFor bool
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}{
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{
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name: "All shards available except one",
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totalShards: erasure_coding.TotalShardsCount - 1,
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shardToRecover: 5,
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expectSufficientFor: true,
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},
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{
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name: "Exactly minimum shards (DataShardsCount)",
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totalShards: erasure_coding.DataShardsCount,
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shardToRecover: 13,
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expectSufficientFor: true,
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},
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{
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name: "One less than minimum",
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totalShards: erasure_coding.DataShardsCount - 1,
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shardToRecover: 10,
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expectSufficientFor: false,
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},
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{
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name: "Only half the shards",
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totalShards: erasure_coding.TotalShardsCount / 2,
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shardToRecover: 0,
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expectSufficientFor: false,
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},
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{
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name: "All data shards available",
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totalShards: erasure_coding.DataShardsCount,
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shardToRecover: 11, // Recovering a parity shard
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expectSufficientFor: true,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Simulate the bufs array that would be populated
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bufs := make([][]byte, erasure_coding.MaxShardCount)
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// Fill in available shards (excluding the one to recover)
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shardCount := 0
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for i := 0; i < erasure_coding.TotalShardsCount && shardCount < tt.totalShards; i++ {
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if i != tt.shardToRecover {
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bufs[i] = make([]byte, 1024) // dummy data
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shardCount++
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}
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}
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// Count available and missing shards (mimicking the corrected code)
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availableShards := make([]erasure_coding.ShardId, 0, erasure_coding.TotalShardsCount)
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missingShards := make([]erasure_coding.ShardId, 0, erasure_coding.ParityShardsCount+1)
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for shardId := 0; shardId < erasure_coding.TotalShardsCount; shardId++ {
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if bufs[shardId] != nil {
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availableShards = append(availableShards, erasure_coding.ShardId(shardId))
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} else {
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missingShards = append(missingShards, erasure_coding.ShardId(shardId))
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}
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}
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// Verify the count matches expectations
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hasSufficient := len(availableShards) >= erasure_coding.DataShardsCount
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if hasSufficient != tt.expectSufficientFor {
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t.Errorf("Expected sufficient=%v, got sufficient=%v (available=%d, need=%d)",
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tt.expectSufficientFor, hasSufficient, len(availableShards), erasure_coding.DataShardsCount)
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}
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t.Logf("Available shards: %d %v, Missing shards: %d %v",
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len(availableShards), availableShards,
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len(missingShards), missingShards)
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})
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}
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}
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// TestRecoverOneRemoteEcShardInterval_ErrorMessage tests the improved error messages
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func TestRecoverOneRemoteEcShardInterval_ErrorMessage(t *testing.T) {
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volumeId := needle.VolumeId(42)
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shardIdToRecover := erasure_coding.ShardId(7)
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// Simulate insufficient shards scenario
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availableShards := []erasure_coding.ShardId{0, 1, 2, 3, 4, 5, 6}
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missingShards := []erasure_coding.ShardId{7, 8, 9, 10, 11, 12, 13}
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// Verify error message contains all required information
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expectedErr := fmt.Errorf("cannot recover shard %d.%d: only %d shards available %v, need at least %d (missing: %v)",
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volumeId, shardIdToRecover,
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len(availableShards), availableShards,
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erasure_coding.DataShardsCount, missingShards)
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errMsg := expectedErr.Error()
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// Check that error message contains key information
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if !strings.Contains(errMsg, fmt.Sprintf("shard %d.%d", volumeId, shardIdToRecover)) {
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t.Errorf("Error message missing volume.shard identifier")
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}
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if !strings.Contains(errMsg, fmt.Sprintf("%d shards available", len(availableShards))) {
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t.Errorf("Error message missing available shard count")
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}
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if !strings.Contains(errMsg, fmt.Sprintf("need at least %d", erasure_coding.DataShardsCount)) {
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t.Errorf("Error message missing required shard count")
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}
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t.Logf("Error message format validated: %s", errMsg)
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}
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// TestRecoverOneRemoteEcShardInterval_ReconstructDataSlicing tests the buffer slicing fix
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func TestRecoverOneRemoteEcShardInterval_ReconstructDataSlicing(t *testing.T) {
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// This test validates that we pass bufs[:TotalShardsCount] to ReconstructData
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// instead of the full bufs array which could be MaxShardCount (32)
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enc, err := reedsolomon.New(erasure_coding.DataShardsCount, erasure_coding.ParityShardsCount)
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if err != nil {
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t.Fatalf("Failed to create encoder: %v", err)
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}
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// Create test data
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shardSize := 1024
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bufs := make([][]byte, erasure_coding.MaxShardCount)
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// Fill data shards
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for i := 0; i < erasure_coding.DataShardsCount; i++ {
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bufs[i] = make([]byte, shardSize)
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for j := range bufs[i] {
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bufs[i][j] = byte(i + j)
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}
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}
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// Create parity shards (initially nil)
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for i := erasure_coding.DataShardsCount; i < erasure_coding.TotalShardsCount; i++ {
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bufs[i] = make([]byte, shardSize)
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}
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// Encode to generate parity
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if err := enc.Encode(bufs[:erasure_coding.TotalShardsCount]); err != nil {
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t.Fatalf("Failed to encode: %v", err)
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}
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// Simulate loss of shard 5
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originalShard5 := make([]byte, shardSize)
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copy(originalShard5, bufs[5])
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bufs[5] = nil
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// Reconstruct using only TotalShardsCount elements (not MaxShardCount)
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if err := enc.ReconstructData(bufs[:erasure_coding.TotalShardsCount]); err != nil {
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t.Fatalf("Failed to reconstruct data: %v", err)
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}
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// Verify shard 5 was recovered correctly
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if bufs[5] == nil {
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t.Errorf("Shard 5 was not recovered")
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} else {
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for i := range originalShard5 {
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if originalShard5[i] != bufs[5][i] {
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t.Errorf("Recovered shard 5 data mismatch at byte %d: expected %d, got %d",
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i, originalShard5[i], bufs[5][i])
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break
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}
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}
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}
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t.Logf("Successfully reconstructed shard with proper buffer slicing")
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}
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// TestRecoverOneRemoteEcShardInterval_ParityShardRecovery tests recovering parity shards
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func TestRecoverOneRemoteEcShardInterval_ParityShardRecovery(t *testing.T) {
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// Parity shards (10-13) should be recoverable with all data shards (0-9)
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enc, err := reedsolomon.New(erasure_coding.DataShardsCount, erasure_coding.ParityShardsCount)
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if err != nil {
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t.Fatalf("Failed to create encoder: %v", err)
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}
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shardSize := 512
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bufs := make([][]byte, erasure_coding.TotalShardsCount)
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// Fill all shards initially
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for i := 0; i < erasure_coding.TotalShardsCount; i++ {
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bufs[i] = make([]byte, shardSize)
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for j := range bufs[i] {
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bufs[i][j] = byte(i * j)
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}
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}
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// Encode
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if err := enc.Encode(bufs); err != nil {
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t.Fatalf("Failed to encode: %v", err)
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}
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// Test recovering each parity shard
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for parityShard := erasure_coding.DataShardsCount; parityShard < erasure_coding.TotalShardsCount; parityShard++ {
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t.Run(fmt.Sprintf("RecoverParity%d", parityShard), func(t *testing.T) {
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testBufs := make([][]byte, erasure_coding.TotalShardsCount)
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for i := range testBufs {
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if i != parityShard {
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testBufs[i] = make([]byte, shardSize)
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copy(testBufs[i], bufs[i])
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}
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}
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// Reconstruct (handles both data and parity)
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if err := enc.Reconstruct(testBufs); err != nil {
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t.Errorf("Failed to reconstruct parity shard %d: %v", parityShard, err)
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}
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// Verify
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if testBufs[parityShard] == nil {
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t.Errorf("Parity shard %d was not recovered", parityShard)
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}
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})
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}
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}
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// TestRecoverOneRemoteEcShardInterval_ConcurrentShardReading tests the concurrent shard reading
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func TestRecoverOneRemoteEcShardInterval_ConcurrentShardReading(t *testing.T) {
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// Simulate the concurrent reading pattern in recoverOneRemoteEcShardInterval
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shardIdToRecover := erasure_coding.ShardId(7)
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shardLocations := make(map[erasure_coding.ShardId][]pb.ServerAddress)
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for i := 0; i < erasure_coding.TotalShardsCount; i++ {
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if i != int(shardIdToRecover) {
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shardLocations[erasure_coding.ShardId(i)] = []pb.ServerAddress{"server1:8080"}
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}
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}
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// Simulate concurrent shard reading
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bufs := make([][]byte, erasure_coding.MaxShardCount)
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var wg sync.WaitGroup
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var mu sync.Mutex
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readErrors := make(map[erasure_coding.ShardId]error)
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for shardId, locations := range shardLocations {
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if shardId == shardIdToRecover {
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continue
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}
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if len(locations) == 0 {
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continue
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}
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wg.Add(1)
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go func(sid erasure_coding.ShardId) {
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defer wg.Done()
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// Simulate successful read
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data := make([]byte, 1024)
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for i := range data {
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data[i] = byte(sid)
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}
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mu.Lock()
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bufs[sid] = data
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mu.Unlock()
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}(shardId)
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}
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wg.Wait()
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// Count available shards
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availableCount := 0
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for i := 0; i < erasure_coding.TotalShardsCount; i++ {
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if bufs[i] != nil {
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availableCount++
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}
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}
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expectedCount := erasure_coding.TotalShardsCount - 1 // All except the one to recover
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if availableCount != expectedCount {
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t.Errorf("Expected %d shards to be read, got %d", expectedCount, availableCount)
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}
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// Verify no errors occurred
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if len(readErrors) > 0 {
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t.Errorf("Unexpected read errors: %v", readErrors)
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}
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t.Logf("Successfully simulated concurrent reading of %d shards", availableCount)
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}
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// TestRecoverOneRemoteEcShardInterval_BuggyMaxShardCount tests the fix for the bug where
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// buffers beyond TotalShardsCount were incorrectly counted as available
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func TestRecoverOneRemoteEcShardInterval_BuggyMaxShardCount(t *testing.T) {
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// This test would have failed with the original buggy code that iterated up to MaxShardCount
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// The bug: if bufs[15..31] had non-nil values, they would be counted as "available"
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// even though they should be ignored (only indices 0-13 matter for TotalShardsCount=14)
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bufs := make([][]byte, erasure_coding.MaxShardCount)
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// Set up only 9 valid shards (less than DataShardsCount=10)
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for i := 0; i < 9; i++ {
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bufs[i] = make([]byte, 1024)
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}
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// CRITICAL: Set garbage data in indices beyond TotalShardsCount
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// The buggy code would count these, making it think we have enough shards
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for i := erasure_coding.TotalShardsCount; i < erasure_coding.MaxShardCount; i++ {
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bufs[i] = make([]byte, 1024) // This should be IGNORED
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}
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// Count using the CORRECTED logic (should only check 0..TotalShardsCount-1)
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availableShards := make([]erasure_coding.ShardId, 0, erasure_coding.TotalShardsCount)
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missingShards := make([]erasure_coding.ShardId, 0, erasure_coding.ParityShardsCount+1)
|
||||
for shardId := 0; shardId < erasure_coding.TotalShardsCount; shardId++ {
|
||||
if bufs[shardId] != nil {
|
||||
availableShards = append(availableShards, erasure_coding.ShardId(shardId))
|
||||
} else {
|
||||
missingShards = append(missingShards, erasure_coding.ShardId(shardId))
|
||||
}
|
||||
}
|
||||
|
||||
// With corrected code: should have 9 available shards (insufficient)
|
||||
if len(availableShards) != 9 {
|
||||
t.Errorf("Expected 9 available shards, got %d", len(availableShards))
|
||||
}
|
||||
|
||||
if len(availableShards) >= erasure_coding.DataShardsCount {
|
||||
t.Errorf("CRITICAL BUG: Incorrectly counted buffers beyond TotalShardsCount as available!")
|
||||
}
|
||||
|
||||
// Count using the BUGGY logic (what the old code did)
|
||||
buggyAvailableCount := 0
|
||||
for shardId := 0; shardId < erasure_coding.MaxShardCount; shardId++ {
|
||||
if bufs[shardId] != nil {
|
||||
buggyAvailableCount++
|
||||
}
|
||||
}
|
||||
|
||||
// The buggy code would have counted 9 + 18 = 27 shards (WRONG!)
|
||||
if buggyAvailableCount != 27 {
|
||||
t.Errorf("Expected buggy logic to count 27 shards, got %d", buggyAvailableCount)
|
||||
}
|
||||
|
||||
t.Logf("✅ Corrected code: %d shards (correct, insufficient)", len(availableShards))
|
||||
t.Logf("❌ Buggy code would have counted: %d shards (incorrect, falsely sufficient)", buggyAvailableCount)
|
||||
t.Logf("Missing shards: %v", missingShards)
|
||||
}
|
||||
Reference in New Issue
Block a user