forked from TrueCloudLab/frostfs-node
[#191] engine: Allow to remove redundant object copies
RemoveDuplicates() removes all duplicate object copies stored on multiple shards. All shards are processed and the command tries to leave a copy on the best shard according to HRW. Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
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4 changed files with 358 additions and 5 deletions
208
pkg/local_object_storage/engine/remove_copies_test.go
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208
pkg/local_object_storage/engine/remove_copies_test.go
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package engine
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import (
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"context"
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"sync"
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"testing"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/teststore"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
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cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
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objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
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"github.com/stretchr/testify/require"
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)
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func TestRebalance(t *testing.T) {
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te := newEngineWithErrorThreshold(t, "", 0)
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const (
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objCount = 20
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copyCount = (objCount + 2) / 3
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)
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type objectWithShard struct {
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bestShard shard.ID
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worstShard shard.ID
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object *objectSDK.Object
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}
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objects := make([]objectWithShard, objCount)
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for i := range objects {
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obj := testutil.GenerateObjectWithCID(cidtest.ID())
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obj.SetPayload(make([]byte, errSmallSize))
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objects[i].object = obj
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shards := te.ng.sortShardsByWeight(object.AddressOf(obj))
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objects[i].bestShard = *shards[0].Shard.ID()
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objects[i].worstShard = *shards[1].Shard.ID()
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}
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for i := range objects {
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var prm shard.PutPrm
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prm.SetObject(objects[i].object)
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var err1, err2 error
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te.ng.mtx.RLock()
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// Every 3rd object (i%3 == 0) is put to both shards, others are distributed.
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if i%3 != 1 {
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_, err1 = te.ng.shards[te.shards[0].id.String()].Shard.Put(prm)
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}
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if i%3 != 2 {
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_, err2 = te.ng.shards[te.shards[1].id.String()].Shard.Put(prm)
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}
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te.ng.mtx.RUnlock()
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require.NoError(t, err1)
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require.NoError(t, err2)
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}
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var removedMtx sync.Mutex
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var removed []deleteEvent
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for _, shard := range te.shards {
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id := *shard.id
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shard.largeFileStorage.SetOption(teststore.WithDelete(func(prm common.DeletePrm) (common.DeleteRes, error) {
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removedMtx.Lock()
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removed = append(removed, deleteEvent{shardID: id, addr: prm.Address})
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removedMtx.Unlock()
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return common.DeleteRes{}, nil
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}))
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}
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err := te.ng.RemoveDuplicates(context.Background(), RemoveDuplicatesPrm{})
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require.NoError(t, err)
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require.Equal(t, copyCount, len(removed))
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removedMask := make([]bool, len(objects))
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loop:
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for i := range removed {
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for j := range objects {
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if removed[i].addr == object.AddressOf(objects[j].object) {
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require.Equal(t, objects[j].worstShard, removed[i].shardID,
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"object %d was expected to be removed from another shard", j)
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removedMask[j] = true
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continue loop
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}
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}
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require.FailNow(t, "unexpected object was removed", removed[i].addr)
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}
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for i := 0; i < copyCount; i++ {
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if i%3 == 0 {
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require.True(t, removedMask[i], "object %d was expected to be removed", i)
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} else {
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require.False(t, removedMask[i], "object %d was not expected to be removed", i)
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}
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}
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}
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func TestRebalanceSingleThread(t *testing.T) {
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te := newEngineWithErrorThreshold(t, "", 0)
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obj := testutil.GenerateObjectWithCID(cidtest.ID())
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obj.SetPayload(make([]byte, errSmallSize))
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var prm shard.PutPrm
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prm.SetObject(obj)
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te.ng.mtx.RLock()
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_, err1 := te.ng.shards[te.shards[0].id.String()].Shard.Put(prm)
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_, err2 := te.ng.shards[te.shards[1].id.String()].Shard.Put(prm)
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te.ng.mtx.RUnlock()
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require.NoError(t, err1)
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require.NoError(t, err2)
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signal := make(chan struct{}) // unblock rebalance
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started := make(chan struct{}) // make sure rebalance is started
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for _, shard := range te.shards {
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shard.largeFileStorage.SetOption(teststore.WithDelete(func(common.DeletePrm) (common.DeleteRes, error) {
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close(started)
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<-signal
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return common.DeleteRes{}, nil
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}))
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}
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var firstErr error
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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firstErr = te.ng.RemoveDuplicates(context.Background(), RemoveDuplicatesPrm{})
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}()
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<-started
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secondErr := te.ng.RemoveDuplicates(context.Background(), RemoveDuplicatesPrm{})
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require.ErrorIs(t, secondErr, errRemoveDuplicatesInProgress)
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close(signal)
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wg.Wait()
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require.NoError(t, firstErr)
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}
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type deleteEvent struct {
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shardID shard.ID
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addr oid.Address
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}
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func TestRebalanceExitByContext(t *testing.T) {
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te := newEngineWithErrorThreshold(t, "", 0)
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objects := make([]*objectSDK.Object, 4)
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for i := range objects {
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obj := testutil.GenerateObjectWithCID(cidtest.ID())
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obj.SetPayload(make([]byte, errSmallSize))
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objects[i] = obj
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}
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for i := range objects {
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var prm shard.PutPrm
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prm.SetObject(objects[i])
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te.ng.mtx.RLock()
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_, err1 := te.ng.shards[te.shards[0].id.String()].Shard.Put(prm)
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_, err2 := te.ng.shards[te.shards[1].id.String()].Shard.Put(prm)
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te.ng.mtx.RUnlock()
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require.NoError(t, err1)
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require.NoError(t, err2)
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}
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var removed []deleteEvent
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deleteCh := make(chan struct{})
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signal := make(chan struct{})
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for _, shard := range te.shards {
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id := *shard.id
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shard.largeFileStorage.SetOption(teststore.WithDelete(func(prm common.DeletePrm) (common.DeleteRes, error) {
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deleteCh <- struct{}{}
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<-signal
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removed = append(removed, deleteEvent{shardID: id, addr: prm.Address})
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return common.DeleteRes{}, nil
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}))
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}
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ctx, cancel := context.WithCancel(context.Background())
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var rebalanceErr error
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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rebalanceErr = te.ng.RemoveDuplicates(ctx, RemoveDuplicatesPrm{Concurrency: 1})
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}()
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const removeCount = 3
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for i := 0; i < removeCount-1; i++ {
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<-deleteCh
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signal <- struct{}{}
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}
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<-deleteCh
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cancel()
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close(signal)
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wg.Wait()
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require.ErrorIs(t, rebalanceErr, context.Canceled)
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require.Equal(t, removeCount, len(removed))
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}
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