if err != nil {
		return err
	}

	wk, err := workers.New(workerSize)
	if err != nil {
		// invalid worker size.
		return err
	}

	ctx, cancelCause := context.WithCancelCause(ctx)
	defer cancelCause(nil)

	results := make(chan itemOrErr[ObjectInfo], workerSize)
	go func() {
		prefixes := r.Prefix.F()
		if len(prefixes) == 0 {
			prefixes = []string{""}
		}

			// invalid worker size.
			return err
		}

		walkQuorum := env.Get("_MINIO_BATCH_REPLICATION_WALK_QUORUM", "strict")
		if walkQuorum == "" {
			walkQuorum = "strict"
		}
		ctx, cancelCause := context.WithCancelCause(ctx)
		// one of source/target is s3, skip delete marker and all versions under the same object name.

	if err := checkListObjsArgs(ctx, bucket, prefix, ""); err != nil {
		xioutil.SafeClose(results)
		return err
	}
	parentCtx := ctx
	ctx, cancelCause := context.WithCancelCause(ctx)
	var entries []chan metaCacheEntry

	for poolIdx, erasureSet := range z.serverPools {
		for setIdx, set := range erasureSet.sets {
			set := set