// TestMultiRangeScanReverseScanInconsistent verifies that a Scan/ReverseScan
// across ranges that doesn't require read consistency will set a timestamp
// using the clock local to the distributed sender.
func TestMultiRangeScanReverseScanInconsistent(t *testing.T) {
	defer leaktest.AfterTest(t)
	s, db := setupMultipleRanges(t, "b")
	defer s.Stop()

	// Write keys "a" and "b", the latter of which is the first key in the
	// second range.
	keys := []string{"a", "b"}
	ts := []time.Time{}
	b := &client.Batch{}
	for _, key := range keys {
		b.Put(key, "value")
	}
	if err := db.Run(b); err != nil {
		t.Fatal(err)
	}
	for i := range keys {
		ts = append(ts, b.Results[i].Rows[0].Timestamp())
		log.Infof("%d: %s", i, b.Results[i].Rows[0].Timestamp())
	}

	// Do an inconsistent Scan/ReverseScan from a new DistSender and verify
	// it does the read at its local clock and doesn't receive an
	// OpRequiresTxnError. We set the local clock to the timestamp of
	// the first key to verify it's used to read only key "a".
	manual := hlc.NewManualClock(ts[1].UnixNano() - 1)
	clock := hlc.NewClock(manual.UnixNano)
	ds := kv.NewDistSender(&kv.DistSenderContext{Clock: clock}, s.Gossip())

	// Scan.
	call := proto.ScanCall(proto.Key("a"), proto.Key("c"), 0)
	sr := call.Reply.(*proto.ScanResponse)
	sa := call.Args.(*proto.ScanRequest)
	sa.ReadConsistency = proto.INCONSISTENT
	if err := client.SendCall(ds, call); err != nil {
		t.Fatal(err)
	}
	if l := len(sr.Rows); l != 1 {
		t.Fatalf("expected 1 row; got %d", l)
	}
	if key := string(sr.Rows[0].Key); keys[0] != key {
		t.Errorf("expected key %q; got %q", keys[0], key)
	}

	// ReverseScan.
	call = proto.ReverseScanCall(proto.Key("a"), proto.Key("c"), 0)
	rsr := call.Reply.(*proto.ReverseScanResponse)
	rsa := call.Args.(*proto.ReverseScanRequest)
	rsa.ReadConsistency = proto.INCONSISTENT
	if err := client.SendCall(ds, call); err != nil {
		t.Fatal(err)
	}
	if l := len(rsr.Rows); l != 1 {
		t.Fatalf("expected 1 row; got %d", l)
	}
	if key := string(rsr.Rows[0].Key); keys[0] != key {
		t.Errorf("expected key %q; got %q", keys[0], key)
	}
}
Example #2
0
func (b *Batch) scan(s, e interface{}, maxRows int64, isReverse bool) {
	begin, err := marshalKey(s)
	if err != nil {
		b.initResult(0, 0, err)
		return
	}
	end, err := marshalKey(e)
	if err != nil {
		b.initResult(0, 0, err)
		return
	}
	if !isReverse {
		b.calls = append(b.calls, proto.ScanCall(proto.Key(begin), proto.Key(end), maxRows))
	} else {
		b.calls = append(b.calls, proto.ReverseScanCall(proto.Key(begin), proto.Key(end), maxRows))
	}
	b.initResult(1, 0, nil)
}