Golang tsm1.NewTSMKeyIterator函數代碼示例

// Tests that a single TSM file can be read and iterated over
func TestTSMKeyIterator_Chunked(t *testing.T) {
	dir := MustTempDir()
	defer os.RemoveAll(dir)

	v0 := tsm1.NewValue(1, 1.1)
	writes := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v0},
	}

	r1 := MustTSMReader(dir, 1, writes)

	v1 := tsm1.NewValue(2, 2.1)
	writes1 := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v1},
	}

	r2 := MustTSMReader(dir, 2, writes1)

	iter, err := tsm1.NewTSMKeyIterator(2, false, r1, r2)
	if err != nil {
		t.Fatalf("unexpected error creating WALKeyIterator: %v", err)
	}

	var readValues bool
	var chunk int
	for iter.Next() {
		key, _, _, block, err := iter.Read()
		if err != nil {
			t.Fatalf("unexpected error read: %v", err)
		}

		values, err := tsm1.DecodeBlock(block, nil)
		if err != nil {
			t.Fatalf("unexpected error decode: %v", err)
		}

		if got, exp := key, "cpu,host=A#!~#value"; got != exp {
			t.Fatalf("key mismatch: got %v, exp %v", got, exp)
		}

		if got, exp := len(values), 2; got != exp {
			t.Fatalf("values length mismatch: got %v, exp %v", got, exp)
		}

		readValues = len(values) > 0
		assertValueEqual(t, values[0], v0)
		assertValueEqual(t, values[1], v1)

		chunk++
	}

	if got, exp := chunk, 1; got != exp {
		t.Fatalf("chunk count mismatch: got %v, exp %v", got, exp)
	}
	if !readValues {
		t.Fatalf("failed to read any values")
	}
}

// Tests that duplicate point values are merged.  There is only one case
// where this could happen and that is when a compaction completed and we replace
// the old TSM file with a new one and we crash just before deleting the old file.
// No data is lost but the same point time/value would exist in two files until
// compaction corrects it.
func TestTSMKeyIterator_Duplicate(t *testing.T) {
	dir := MustTempDir()
	defer os.RemoveAll(dir)

	v1 := tsm1.NewValue(1, int64(1))
	v2 := tsm1.NewValue(1, int64(2))

	writes1 := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v1},
	}

	r1 := MustTSMReader(dir, 1, writes1)

	writes2 := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v2},
	}

	r2 := MustTSMReader(dir, 2, writes2)

	iter, err := tsm1.NewTSMKeyIterator(1, false, r1, r2)
	if err != nil {
		t.Fatalf("unexpected error creating WALKeyIterator: %v", err)
	}

	var readValues bool
	for iter.Next() {
		key, _, _, block, err := iter.Read()
		if err != nil {
			t.Fatalf("unexpected error read: %v", err)
		}

		values, err := tsm1.DecodeBlock(block, nil)
		if err != nil {
			t.Fatalf("unexpected error decode: %v", err)
		}

		if got, exp := key, "cpu,host=A#!~#value"; got != exp {
			t.Fatalf("key mismatch: got %v, exp %v", got, exp)
		}

		if got, exp := len(values), 1; got != exp {
			t.Fatalf("values length mismatch: got %v, exp %v", got, exp)
		}

		readValues = true
		assertValueEqual(t, values[0], v2)
	}

	if !readValues {
		t.Fatalf("failed to read any values")
	}
}

// Tests that a single TSM file can be read and iterated over
func TestTSMKeyIterator_Chunked(t *testing.T) {
	t.Skip("fixme")
	dir := MustTempDir()
	defer os.RemoveAll(dir)

	v0 := tsm1.NewValue(1, 1.1)
	v1 := tsm1.NewValue(2, 2.1)
	writes := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v0, v1},
	}

	r := MustTSMReader(dir, 1, writes)

	iter, err := tsm1.NewTSMKeyIterator(1, false, r)
	if err != nil {
		t.Fatalf("unexpected error creating WALKeyIterator: %v", err)
	}

	var readValues bool
	var chunk int
	for iter.Next() {
		key, _, _, block, err := iter.Read()
		if err != nil {
			t.Fatalf("unexpected error read: %v", err)
		}

		values, err := tsm1.DecodeBlock(block, nil)
		if err != nil {
			t.Fatalf("unexpected error decode: %v", err)
		}

		if got, exp := key, "cpu,host=A#!~#value"; got != exp {
			t.Fatalf("key mismatch: got %v, exp %v", got, exp)
		}

		if got, exp := len(values), len(writes); got != exp {
			t.Fatalf("values length mismatch: got %v, exp %v", got, exp)
		}

		for _, v := range values {
			readValues = true
			assertValueEqual(t, v, writes["cpu,host=A#!~#value"][chunk])
		}
		chunk++
	}

	if !readValues {
		t.Fatalf("failed to read any values")
	}
}

// Tests that deleted keys are not seen during iteration with
// TSM files.
func TestTSMKeyIterator_MultipleKeysDeleted(t *testing.T) {
	dir := MustTempDir()
	defer os.RemoveAll(dir)

	v1 := tsm1.NewValue(2, int64(1))
	points1 := map[string][]tsm1.Value{
		"cpu,host=A#!~#value": []tsm1.Value{v1},
	}

	r1 := MustTSMReader(dir, 1, points1)
	if e := r1.Delete([]string{"cpu,host=A#!~#value"}); nil != e {
		t.Fatal(e)
	}

	v2 := tsm1.NewValue(1, float64(1))
	v3 := tsm1.NewValue(1, float64(1))

	points2 := map[string][]tsm1.Value{
		"cpu,host=A#!~#count": []tsm1.Value{v2},
		"cpu,host=B#!~#value": []tsm1.Value{v3},
	}

	r2 := MustTSMReader(dir, 2, points2)
	r2.Delete([]string{"cpu,host=A#!~#count"})

	iter, err := tsm1.NewTSMKeyIterator(1, false, r1, r2)
	if err != nil {
		t.Fatalf("unexpected error creating WALKeyIterator: %v", err)
	}

	var readValues bool
	var data = []struct {
		key   string
		value tsm1.Value
	}{
		{"cpu,host=B#!~#value", v3},
	}

	for iter.Next() {
		key, _, _, block, err := iter.Read()
		if err != nil {
			t.Fatalf("unexpected error read: %v", err)
		}

		values, err := tsm1.DecodeBlock(block, nil)
		if err != nil {
			t.Fatalf("unexpected error decode: %v", err)
		}

		if got, exp := key, data[0].key; got != exp {
			t.Fatalf("key mismatch: got %v, exp %v", got, exp)
		}

		if got, exp := len(values), 1; got != exp {
			t.Fatalf("values length mismatch: got %v, exp %v", got, exp)
		}
		readValues = true

		assertValueEqual(t, values[0], data[0].value)
		data = data[1:]
	}

	if !readValues {
		t.Fatalf("failed to read any values")
	}
}