[#1667] shard: Drop shard pool

After adding an ops limiter, shard's `put` pool is redundant.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/engine/shards.go

@@ -17,7 +17,6 @@ import (
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/hrw"
 	"github.com/google/uuid"
-	"github.com/panjf2000/ants/v2"
 	"go.uber.org/zap"
 	"golang.org/x/sync/errgroup"
 )
@@ -181,11 +180,6 @@ func (e *StorageEngine) addShard(sh *shard.Shard) error {
 	e.mtx.Lock()
 	defer e.mtx.Unlock()
 
-	pool, err := ants.NewPool(int(e.shardPoolSize), ants.WithNonblocking(true))
-	if err != nil {
-		return fmt.Errorf("create pool: %w", err)
-	}
-
 	strID := sh.ID().String()
 	if _, ok := e.shards[strID]; ok {
 		return fmt.Errorf("shard with id %s was already added", strID)
@@ -199,8 +193,6 @@ func (e *StorageEngine) addShard(sh *shard.Shard) error {
 		hash: hrw.StringHash(strID),
 	}
 
-	e.shardPools[strID] = pool
-
 	return nil
 }
 
@@ -225,12 +217,6 @@ func (e *StorageEngine) removeShards(ctx context.Context, ids ...string) {
 		ss = append(ss, sh)
 		delete(e.shards, id)
 
-		pool, ok := e.shardPools[id]
-		if ok {
-			pool.Release()
-			delete(e.shardPools, id)
-		}
-
 		e.log.Info(ctx, logs.EngineShardHasBeenRemoved,
 			zap.String("id", id))
 	}
@@ -429,12 +415,6 @@ func (e *StorageEngine) deleteShards(ctx context.Context, ids []*shard.ID) ([]ha
 
 		delete(e.shards, idStr)
 
-		pool, ok := e.shardPools[idStr]
-		if ok {
-			pool.Release()
-			delete(e.shardPools, idStr)
-		}
-
 		e.log.Info(ctx, logs.EngineShardHasBeenRemoved,
 			zap.String("id", idStr))
 	}