featurebase/server/server_test.go

// Copyright 2017 Pilosa Corp.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package server_test

import (
	"bytes"
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"io/ioutil"
	"math/rand"
	"reflect"
	"sort"
	"strconv"
	"strings"
	"testing"
	"testing/quick"
	"time"

	"github.com/pelletier/go-toml"
	"github.com/pilosa/pilosa"
	"github.com/pilosa/pilosa/http"
	"github.com/pilosa/pilosa/roaring"
	"github.com/pilosa/pilosa/server"
	"github.com/pilosa/pilosa/test"
	"golang.org/x/sync/errgroup"
)

var runStress bool

func init() { // nolint: gochecknoinits
	flag.BoolVar(&runStress, "stress", false, "Enable stress tests (time consuming)")
}

// Ensure program can process queries and maintain consistency.
func TestMain_Set_Quick(t *testing.T) {
	if testing.Short() {
		t.Skip("short")
	}

	if err := quick.Check(func(cmds []SetCommand) bool {
		m := test.MustRunCommand()
		defer m.Close()

		// Create client.
		client, err := http.NewInternalClient(m.API.Node().URI.HostPort(), http.GetHTTPClient(nil))
		if err != nil {
			t.Fatal(err)
		}

		// Execute Set() commands.
		for _, cmd := range cmds {
			if err := client.CreateIndex(context.Background(), "i", pilosa.IndexOptions{}); err != nil && err != pilosa.ErrIndexExists {
				t.Fatal(err)
			}
			if err := client.CreateField(context.Background(), "i", cmd.Field); err != nil && err != pilosa.ErrFieldExists {
				t.Fatal(err)
			}
			if _, err := m.Query("i", "", fmt.Sprintf(`Set(%d, %s=%d)`, cmd.ColumnID, cmd.Field, cmd.ID)); err != nil {
				t.Fatal(err)
			}
		}

		// Validate data.
		for field, fieldSet := range SetCommands(cmds).Fields() {
			for id, columnIDs := range fieldSet {
				exp := MustMarshalJSON(map[string]interface{}{
					"results": []interface{}{
						map[string]interface{}{
							"columns": columnIDs,
							"attrs":   map[string]interface{}{},
						},
					},
				}) + "\n"
				if res, err := m.Query("i", "", fmt.Sprintf(`Row(%s=%d)`, field, id)); err != nil {
					t.Fatal(err)
				} else if res != exp {
					t.Fatalf("unexpected result:\n\ngot=%s\n\nexp=%s\n\n", res, exp)
				}
			}
		}

		if err := m.Reopen(); err != nil {
			t.Fatal(err)
		}

		// Validate data after reopening.
		for field, fieldSet := range SetCommands(cmds).Fields() {
			for id, columnIDs := range fieldSet {
				exp := MustMarshalJSON(map[string]interface{}{
					"results": []interface{}{
						map[string]interface{}{
							"columns": columnIDs,
							"attrs":   map[string]interface{}{},
						},
					},
				}) + "\n"
				if res, err := m.Query("i", "", fmt.Sprintf(`Row(%s=%d)`, field, id)); err != nil {
					t.Fatal(err)
				} else if res != exp {
					t.Fatalf("unexpected result (reopen):\n\ngot=%s\n\nexp=%s\n\n", res, exp)
				}
			}
		}

		return true
	}, &quick.Config{
		Values: func(values []reflect.Value, rand *rand.Rand) {
			values[0] = reflect.ValueOf(GenerateSetCommands(1000, rand))
		},
	}); err != nil {
		t.Fatal(err)
	}
}

// Ensure program can set row attributes and retrieve them.
func TestMain_SetRowAttrs(t *testing.T) {
	m := test.MustRunCommand()
	defer m.Close()

	// Create fields.
	client := m.Client()
	if err := client.CreateIndex(context.Background(), "i", pilosa.IndexOptions{}); err != nil && err != pilosa.ErrIndexExists {
		t.Fatal(err)
	} else if err := client.CreateField(context.Background(), "i", "x"); err != nil {
		t.Fatal(err)
	} else if err := client.CreateField(context.Background(), "i", "z"); err != nil {
		t.Fatal(err)
	} else if err := client.CreateField(context.Background(), "i", "neg"); err != nil {
		t.Fatal(err)
	}

	// Set columns on different rows in different fields.
	if _, err := m.Query("i", "", `Set(100, x=1)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `Set(100, x=2)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `Set(100, x=2)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `Set(100, neg=3)`); err != nil {
		t.Fatal(err)
	}

	// Set row attributes.
	if _, err := m.Query("i", "", `SetRowAttrs(x, 1, x=100)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `SetRowAttrs(x, 2, x=-200)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `SetRowAttrs(z, 2, x=300)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `SetRowAttrs(neg, 3, x=-0.44)`); err != nil {
		t.Fatal(err)
	}

	// Query row x/1.
	if res, err := m.Query("i", "", `Row(x=1)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{"x":100},"columns":[100]}]}`+"\n" {
		t.Fatalf("unexpected result: %s", res)
	}

	// Query row x/2.
	if res, err := m.Query("i", "", `Row(x=2)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{"x":-200},"columns":[100]}]}`+"\n" {
		t.Fatalf("unexpected result: %s", res)
	}

	if err := m.Reopen(); err != nil {
		t.Fatal(err)
	}

	// Query rows after reopening.
	if res, err := m.Query("i", "columnAttrs=true", `Row(x=1)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{"x":100},"columns":[100]}]}`+"\n" {
		t.Fatalf("unexpected result(reopen): %s", res)
	}

	if res, err := m.Query("i", "columnAttrs=true", `Row(neg=3)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{"x":-0.44},"columns":[100]}]}`+"\n" {
		t.Fatalf("unexpected result(reopen): %s", res)
	}
	// Query row x/2.
	if res, err := m.Query("i", "", `Row(x=2)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{"x":-200},"columns":[100]}]}`+"\n" {
		t.Fatalf("unexpected result: %s", res)
	}
}

// Ensure program can set column attributes and retrieve them.
func TestMain_SetColumnAttrs(t *testing.T) {
	m := test.MustRunCommand()
	defer m.Close()

	// Create fields.
	client := m.Client()
	if err := client.CreateIndex(context.Background(), "i", pilosa.IndexOptions{}); err != nil && err != pilosa.ErrIndexExists {
		t.Fatal(err)
	} else if err := client.CreateField(context.Background(), "i", "x"); err != nil {
		t.Fatal(err)
	}

	// Set columns on row.
	if _, err := m.Query("i", "", `Set(100, x=1)`); err != nil {
		t.Fatal(err)
	} else if _, err := m.Query("i", "", `Set(101, x=1)`); err != nil {
		t.Fatal(err)
	}

	// Set column attributes.
	if _, err := m.Query("i", "", `SetColumnAttrs(100, foo="bar")`); err != nil {
		t.Fatal(err)
	}

	// Query row.
	if res, err := m.Query("i", "columnAttrs=true", `Row(x=1)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{},"columns":[100,101]}],"columnAttrs":[{"id":100,"attrs":{"foo":"bar"}}]}`+"\n" {
		t.Fatalf("unexpected result: %s", res)
	}

	if err := m.Reopen(); err != nil {
		t.Fatal(err)
	}

	// Query row after reopening.
	if res, err := m.Query("i", "columnAttrs=true", `Row(x=1)`); err != nil {
		t.Fatal(err)
	} else if res != `{"results":[{"attrs":{},"columns":[100,101]}],"columnAttrs":[{"id":100,"attrs":{"foo":"bar"}}]}`+"\n" {
		t.Fatalf("unexpected result(reopen): %s", res)
	}
}

func TestMain_GroupBy(t *testing.T) {
	m := test.MustRunCommand()
	defer m.Close()

	// Create fields.
	client := m.Client()
	if err := client.CreateIndex(context.Background(), "i", pilosa.IndexOptions{}); err != nil && err != pilosa.ErrIndexExists {
		t.Fatal(err)
	}
	if err := client.CreateFieldWithOptions(context.Background(), "i", "generalk", pilosa.FieldOptions{Keys: true}); err != nil {
		t.Fatal(err)
	}
	if err := client.CreateFieldWithOptions(context.Background(), "i", "subk", pilosa.FieldOptions{Keys: true}); err != nil {
		t.Fatal(err)
	}

	query := `
		Set(0, generalk="ten")
		Set(1, generalk="ten")
		Set(1001, generalk="ten")
		Set(2, generalk="eleven")
		Set(1002, generalk="eleven")
		Set(2, generalk="twelve")
		Set(1002, generalk="twelve")

		Set(0, subk="one-hundred")
		Set(1, subk="one-hundred")
		Set(3, subk="one-hundred")
		Set(1001, subk="one-hundred")
		Set(2, subk="one-hundred-ten")
		Set(0, subk="one-hundred-ten")
	`

	// Set columns on row.
	if _, err := m.Query("i", "", query); err != nil {
		t.Fatal(err)
	}

	expected := []pilosa.GroupCount{
		{Group: []pilosa.FieldRow{{Field: "generalk", RowKey: "ten"}, {Field: "subk", RowKey: "one-hundred"}}, Count: 3},
		{Group: []pilosa.FieldRow{{Field: "generalk", RowKey: "ten"}, {Field: "subk", RowKey: "one-hundred-ten"}}, Count: 1},
		{Group: []pilosa.FieldRow{{Field: "generalk", RowKey: "eleven"}, {Field: "subk", RowKey: "one-hundred-ten"}}, Count: 1},
		{Group: []pilosa.FieldRow{{Field: "generalk", RowKey: "twelve"}, {Field: "subk", RowKey: "one-hundred-ten"}}, Count: 1},
	}

	// Query row.
	if res, err := m.QueryProtobuf("i", `GroupBy(Rows(generalk), Rows(subk))`); err != nil {
		t.Fatal(err)
	} else {
		test.CheckGroupBy(t, expected, res.Results[0].([]pilosa.GroupCount))
	}
}

// Ensure the host can be parsed.
func TestConfig_Parse_Host(t *testing.T) {
	if c, err := ParseConfig(`bind = "local"`); err != nil {
		t.Fatal(err)
	} else if c.Bind != "local" {
		t.Fatalf("unexpected host: %s", c.Bind)
	}
}

// Ensure the data directory can be parsed.
func TestConfig_Parse_DataDir(t *testing.T) {
	if c, err := ParseConfig(`data-dir = "/tmp/foo"`); err != nil {
		t.Fatal(err)
	} else if c.DataDir != "/tmp/foo" {
		t.Fatalf("unexpected data dir: %s", c.DataDir)
	}
}

func TestMain_RecalculateHashes(t *testing.T) {
	const clusterSize = 5
	cluster := test.MustRunCluster(t, clusterSize)

	// Create the schema.
	client0 := cluster[0].Client()
	if err := client0.CreateIndex(context.Background(), "i", pilosa.IndexOptions{}); err != nil && err != pilosa.ErrIndexExists {
		t.Fatal("create index:", err)
	}
	if err := client0.CreateField(context.Background(), "i", "f"); err != nil {
		t.Fatal("create field:", err)
	}

	// Set some columns
	data := []string{}
	for rowID := 1; rowID < 10; rowID++ {
		for columnID := 1; columnID < 100; columnID++ {
			data = append(data, fmt.Sprintf(`Set(%d, f=%d)`, columnID, rowID))
		}
	}
	if _, err := cluster[0].Query("i", "", strings.Join(data, "")); err != nil {
		t.Fatal("setting columns:", err)
	}

	// Calculate caches on the first node
	err := cluster[0].RecalculateCaches()
	if err != nil {
		t.Fatalf("recalculating caches: %v", err)
	}

	target := `{"results":[[{"id":7,"count":99},{"id":1,"count":99},{"id":9,"count":99},{"id":5,"count":99},{"id":4,"count":99},{"id":8,"count":99},{"id":2,"count":99},{"id":6,"count":99},{"id":3,"count":99}]]}`

	// Run a TopN query on all nodes. The result should be the same as the target.
	for _, m := range cluster {
		res, err := m.Query("i", "", `TopN(f)`)
		if err != nil {
			t.Fatal(err)
		}
		res = strings.TrimSpace(res)
		if sortedString(target) != sortedString(res) {
			t.Fatalf("%v != %v", target, res)
		}
	}
}

// SetCommand represents a command to set a column.
type SetCommand struct {
	ID       uint64
	Field    string
	ColumnID uint64
}

type SetCommands []SetCommand

// Fields returns the set of column ids for each field/row.
func (a SetCommands) Fields() map[string]map[uint64][]uint64 {
	// Create a set of unique commands.
	m := make(map[SetCommand]struct{})
	for _, cmd := range a {
		m[cmd] = struct{}{}
	}

	// Build unique ids for each field & row.
	fields := make(map[string]map[uint64][]uint64)
	for cmd := range m {
		if fields[cmd.Field] == nil {
			fields[cmd.Field] = make(map[uint64][]uint64)
		}
		fields[cmd.Field][cmd.ID] = append(fields[cmd.Field][cmd.ID], cmd.ColumnID)
	}

	// Sort each set of column ids.
	for _, field := range fields {
		for id := range field {
			sort.Sort(uint64Slice(field[id]))
		}
	}

	return fields
}

// GenerateSetCommands generates random SetCommand objects.
func GenerateSetCommands(n int, rand *rand.Rand) []SetCommand {
	cmds := make([]SetCommand, rand.Intn(n))
	for i := range cmds {
		cmds[i] = SetCommand{
			ID:       uint64(rand.Intn(1000)),
			Field:    "x",
			ColumnID: uint64(rand.Intn(10)),
		}
	}
	return cmds
}

// ParseConfig parses s into a Config.
func ParseConfig(s string) (server.Config, error) {
	var c server.Config
	err := toml.Unmarshal([]byte(s), &c)
	return c, err
}

// MustMarshalJSON marshals v into a string. Panic on error.
func MustMarshalJSON(v interface{}) string {
	buf, err := json.Marshal(v)
	if err != nil {
		panic(err)
	}
	return string(buf)
}

func sortedString(s string) string {
	arr := strings.Split(s, "")
	sort.Strings(arr)
	return strings.Join(arr, "")
}

// uint64Slice represents a sortable slice of uint64 numbers.
type uint64Slice []uint64

func (p uint64Slice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
func (p uint64Slice) Len() int           { return len(p) }
func (p uint64Slice) Less(i, j int) bool { return p[i] < p[j] }

func TestClusteringNodesReplica1(t *testing.T) {
	cluster := test.MustRunCluster(t, 3)
	defer cluster.Close()

	var wait = true
	for wait {
		wait = false
		for _, node := range cluster {
			if node.API.State() != pilosa.ClusterStateNormal {
				wait = true
			}
		}
		time.Sleep(time.Millisecond * 1)
	}

	if err := cluster[2].Command.Close(); err != nil {
		t.Fatalf("closing third node: %v", err)
	}

	// confirm that cluster stops accepting queries after one node closes
	if _, err := cluster[0].API.Query(context.Background(), &pilosa.QueryRequest{}); !strings.Contains(err.Error(), "not allowed in state STARTING") {
		t.Fatalf("got unexpected error querying an incomplete cluster: %v", err)
	}

	// Create new main with the same config.
	config := cluster[2].Command.Config
	config.Translation.MapSize = 100000
	// config.Bind = cluster[2].API.Node().URI.HostPort()

	// this isn't necessary, but makes the test run way faster
	config.Gossip.Port = strconv.Itoa(int(cluster[2].Command.GossipTransport().URI.Port))

	cluster[2].Command = server.NewCommand(cluster[2].Stdin, cluster[2].Stdout, cluster[2].Stderr)
	cluster[2].Command.Config = config

	// Run new program.
	if err := cluster[2].Start(); err != nil {
		t.Fatalf("restarting node 2: %v", err)
	}

	for wait {
		wait = false
		for _, node := range cluster {
			if node.API.State() != pilosa.ClusterStateNormal {
				wait = true
			}
		}
		time.Sleep(time.Millisecond)
	}
}

func TestClusteringNodesReplica2(t *testing.T) {
	cluster := test.MustNewCluster(t, 3)
	for _, c := range cluster {
		c.Config.Cluster.ReplicaN = 2
	}
	err := cluster.Start()
	if err != nil {
		t.Fatalf("starting cluster: %v", err)
	}

	var wait = true
	for wait {
		wait = false
		for _, node := range cluster {
			if node.API.State() != pilosa.ClusterStateNormal {
				wait = true
			}
		}
		time.Sleep(time.Millisecond * 1)
	}

	if err := cluster[2].Command.Close(); err != nil {
		t.Fatalf("closing third node: %v", err)
	}

	if cluster[0].API.State() != pilosa.ClusterStateDegraded {
		t.Fatalf("expected state to be DEGRADED, but got %s", cluster[0].API.State())
	}

	// confirm that cluster keeps accepting queries if replication > 1
	if _, err := cluster[0].API.CreateIndex(context.Background(), "anewindex", pilosa.IndexOptions{}); err != nil {
		t.Fatalf("got unexpected error creating index: %v", err)
	}

	// confirm that cluster stops accepting queries if 2 nodes fail and replication == 2
	if err := cluster[1].Command.Close(); err != nil {
		t.Fatalf("closing 2nd node: %v", err)
	}

	if cluster[0].API.State() != pilosa.ClusterStateStarting {
		t.Fatalf("expected state to be Starting, but got %s", cluster[0].API.State())
	}

	if _, err := cluster[0].API.Query(context.Background(), &pilosa.QueryRequest{}); !strings.Contains(err.Error(), "not allowed in state STARTING") {
		t.Fatalf("got unexpected error querying an incomplete cluster: %v", err)
	}

	// Create new main with the same config.
	config := cluster[2].Command.Config
	config.Translation.MapSize = 100000
	// config.Bind = cluster[2].API.Node().URI.HostPort()

	// this isn't necessary, but makes the test run way faster
	config.Gossip.Port = strconv.Itoa(int(cluster[2].Command.GossipTransport().URI.Port))

	cluster[2].Command = server.NewCommand(cluster[2].Stdin, cluster[2].Stdout, cluster[2].Stderr)
	cluster[2].Command.Config = config

	// Run new program.
	if err := cluster[2].Start(); err != nil {
		t.Fatalf("restarting node 2: %v", err)
	}

	if cluster[0].API.State() != pilosa.ClusterStateDegraded {
		t.Fatalf("expected state to be DEGRADED, but got %s", cluster[0].API.State())
	}

	// Create new main with the same config.
	config = cluster[1].Command.Config
	// config.Bind = cluster[1].API.Node().URI.HostPort()
	config.Translation.MapSize = 100000

	// this isn't necessary, but makes the test run way faster
	config.Gossip.Port = strconv.Itoa(int(cluster[1].Command.GossipTransport().URI.Port))

	cluster[1].Command = server.NewCommand(cluster[1].Stdin, cluster[1].Stdout, cluster[1].Stderr)
	cluster[1].Command.Config = config

	// Run new program.
	if err := cluster[1].Start(); err != nil {
		t.Fatalf("restarting node 2: %v", err)
	}

	defer cluster.Close()

	for wait {
		wait = false
		for _, node := range cluster {
			if node.API.State() != pilosa.ClusterStateNormal {
				wait = true
			}
		}
		time.Sleep(time.Millisecond)
	}
}

func TestRemoveNodeAfterItDies(t *testing.T) {
	cluster := test.MustNewCluster(t, 3)
	for _, c := range cluster {
		c.Config.Cluster.ReplicaN = 2
	}
	err := cluster.Start()
	if err != nil {
		t.Fatalf("starting cluster: %v", err)
	}

	var wait = true
	for wait {
		wait = false
		for _, node := range cluster {
			if node.API.State() != pilosa.ClusterStateNormal {
				wait = true
			}
		}
		time.Sleep(time.Millisecond * 1)
	}

	if err := cluster[2].Command.Close(); err != nil {
		t.Fatalf("closing third node: %v", err)
	}

	if cluster[0].API.State() != pilosa.ClusterStateDegraded {
		t.Fatalf("expected state to be DEGRADED, but got %s", cluster[0].API.State())
	}

	if _, err := cluster[0].API.RemoveNode(cluster[2].API.Node().ID); err != nil {
		t.Fatalf("removing failed node: %v", err)
	}

	if cluster[0].API.State() != pilosa.ClusterStateNormal {
		t.Fatalf("expected state to be DEGRADED, but got %s", cluster[0].API.State())
	}

	hosts := cluster[0].API.Hosts(context.Background())
	if len(hosts) != 2 {
		t.Fatalf("unexpected hosts: %v", hosts)
	}
}

// Ensure program imports timestamps as UTC.
func TestMain_ImportTimestamp(t *testing.T) {
	m := test.MustRunCommand()
	defer m.Close()

	indexName := "i"
	fieldName := "f"

	// Create index.
	if _, err := m.API.CreateIndex(context.Background(), indexName, pilosa.IndexOptions{}); err != nil {
		t.Fatal(err)
	}

	// Create field.
	if _, err := m.API.CreateField(context.Background(), indexName, fieldName, pilosa.OptFieldTypeTime(pilosa.TimeQuantum("YMD"))); err != nil {
		t.Fatal(err)
	}

	data := pilosa.ImportRequest{
		Index:      indexName,
		Field:      fieldName,
		Shard:      0,
		RowIDs:     []uint64{1, 2},
		ColumnIDs:  []uint64{1, 2},
		Timestamps: []int64{1514764800000000000, 1577833200000000000}, // 2018-01-01T00:00, 2019-12-31T23:00
	}

	// Import data.
	if err := m.API.Import(context.Background(), &data); err != nil {
		t.Fatal(err)
	}

	// Ensure the correct views were created.
	dir := fmt.Sprintf("%s/%s/%s/views", m.Config.DataDir, indexName, fieldName)
	files, err := ioutil.ReadDir(dir)
	if err != nil {
		t.Fatal(err)
	}

	exp := []string{
		"standard", "standard_2018", "standard_201801", "standard_20180101",
		"standard_2019", "standard_201912", "standard_20191231",
	}
	got := []string{}
	for _, f := range files {
		got = append(got, f.Name())
	}

	if !reflect.DeepEqual(got, exp) {
		t.Fatalf("expected %v, but got %v", exp, got)
	}
}

func TestMain_ImportTimestampNoStandardView(t *testing.T) {
	m := test.MustRunCommand()
	defer m.Close()

	indexName := "i"
	fieldName := "f-no-standard"

	// Create index.
	if _, err := m.API.CreateIndex(context.Background(), indexName, pilosa.IndexOptions{}); err != nil {
		t.Fatal(err)
	}

	// Create field.
	if _, err := m.API.CreateField(context.Background(), indexName, fieldName, pilosa.OptFieldTypeTime(pilosa.TimeQuantum("YMD"), true)); err != nil {
		t.Fatal(err)
	}

	data := pilosa.ImportRequest{
		Index:      indexName,
		Field:      fieldName,
		Shard:      0,
		RowIDs:     []uint64{1, 2},
		ColumnIDs:  []uint64{1, 2},
		Timestamps: []int64{1514764800000000000, 1577833200000000000}, // 2018-01-01T00:00, 2019-12-31T23:00
	}

	// Import data.
	if err := m.API.Import(context.Background(), &data); err != nil {
		t.Fatal(err)
	}

	// Ensure the correct views were created.
	dir := fmt.Sprintf("%s/%s/%s/views", m.Config.DataDir, indexName, fieldName)
	files, err := ioutil.ReadDir(dir)
	if err != nil {
		t.Fatal(err)
	}

	exp := []string{
		"standard_2018", "standard_201801", "standard_20180101",
		"standard_2019", "standard_201912", "standard_20191231",
	}
	got := []string{}
	for _, f := range files {
		got = append(got, f.Name())
	}

	if !reflect.DeepEqual(got, exp) {
		t.Fatalf("expected %v, but got %v", exp, got)
	}
}

func TestClusterQueriesAfterRestart(t *testing.T) {
	cluster := test.MustRunCluster(t, 3)
	defer cluster.Close()
	cmd1 := cluster[1]

	for _, com := range cluster {
		nodes := com.API.Hosts(context.Background())
		for _, n := range nodes {
			if n.State != "READY" {
				t.Fatalf("unexpected node state after upping cluster: %v", nodes)
			}
		}
	}

	cmd1.MustCreateIndex(t, "testidx", pilosa.IndexOptions{})
	cmd1.MustCreateField(t, "testidx", "testfield", pilosa.OptFieldTypeSet(pilosa.CacheTypeRanked, 10))

	// build a query to set the first bit in 100 shards
	query := strings.Builder{}
	for i := 0; i < 100; i++ {
		query.WriteString(fmt.Sprintf("Set(%d, testfield=0)", i*pilosa.ShardWidth))
	}
	_, err := cmd1.API.Query(context.Background(), &pilosa.QueryRequest{
		Index: "testidx",
		Query: query.String(),
	})
	if err != nil {
		t.Fatalf("setting 100 bits in 100 shards: %v", err)
	}

	results, err := cmd1.API.Query(context.Background(), &pilosa.QueryRequest{
		Index: "testidx",
		Query: "Count(Row(testfield=0))",
	})
	if err != nil {
		t.Fatalf("counting row: %v", err)
	}
	if results.Results[0].(uint64) != 100 {
		t.Fatalf("Count should be 100, but got %v of type %[1]T", results.Results[0])
	}

	err = cmd1.Command.Close()
	if err != nil {
		t.Fatalf("closing node0: %v", err)
	}

	// confirm that cluster stops accepting queries after one node closes
	if _, err := cluster[0].API.Query(context.Background(), &pilosa.QueryRequest{}); !strings.Contains(err.Error(), "not allowed in state STARTING") {
		t.Fatalf("got unexpected error querying an incomplete cluster: %v", err)
	}

	// Create new main with the same config.
	config := cmd1.Command.Config
	config.Bind = cmd1.API.Node().URI.HostPort()

	// this isn't necessary, but makes the test run way faster
	config.Gossip.Port = strconv.Itoa(int(cmd1.Command.GossipTransport().URI.Port))
	cmd1.Command = server.NewCommand(cmd1.Stdin, cmd1.Stdout, cmd1.Stderr)
	cmd1.Command.Config = config
	err = cmd1.Start()
	if err != nil {
		t.Fatalf("reopening node 0: %v", err)
	}

	for cmd1.API.State() != pilosa.ClusterStateNormal {
		time.Sleep(time.Millisecond)
	}

	results, err = cmd1.API.Query(context.Background(), &pilosa.QueryRequest{
		Index: "testidx",
		Query: "Count(Row(testfield=0))",
	})
	if err != nil {
		t.Fatalf("counting row: %v", err)
	}
	if results.Results[0].(uint64) != 100 {
		t.Fatalf("Count should be 100, but got %v of type %[1]T", results.Results[0])
	}
}

// TODO: confirm that things keep working if a node is hard-closed (no nodeLeave event) and immediately restarted with a different address.

func TestClusterExhaustingConnections(t *testing.T) {
	if !runStress {
		t.Skip("stress")
	}
	cluster := test.MustRunCluster(t, 5)
	defer cluster.Close()
	cmd1 := cluster[1]

	for _, com := range cluster {
		nodes := com.API.Hosts(context.Background())
		for _, n := range nodes {
			if n.State != "READY" {
				t.Fatalf("unexpected node state after upping cluster: %v", nodes)
			}
		}
	}

	cmd1.MustCreateIndex(t, "testidx", pilosa.IndexOptions{})
	cmd1.MustCreateField(t, "testidx", "testfield", pilosa.OptFieldTypeSet(pilosa.CacheTypeRanked, 10))

	eg := errgroup.Group{}
	for i := 0; i < 20; i++ {
		i := i
		eg.Go(func() error {
			for j := i; j < 10000; j += 20 {
				_, err := cluster[i%5].API.Query(context.Background(), &pilosa.QueryRequest{
					Index: "testidx",
					Query: fmt.Sprintf("Set(%d, testfield=0)", j*pilosa.ShardWidth),
				})
				if err != nil {
					return err
				}
			}
			return nil
		})
	}
	err := eg.Wait()
	if err != nil {
		t.Fatalf("setting lots of shards: %v", err)
	}
}

func TestClusterExhaustingConnectionsImport(t *testing.T) {
	if !runStress {
		t.Skip("stress")
	}
	cluster := test.MustRunCluster(t, 5)
	defer cluster.Close()
	cmd1 := cluster[1]

	for _, com := range cluster {
		nodes := com.API.Hosts(context.Background())
		for _, n := range nodes {
			if n.State != "READY" {
				t.Fatalf("unexpected node state after upping cluster: %v", nodes)
			}
		}
	}

	cmd1.MustCreateIndex(t, "testidx", pilosa.IndexOptions{})
	cmd1.MustCreateField(t, "testidx", "testfield", pilosa.OptFieldTypeSet(pilosa.CacheTypeRanked, 10))

	bm := roaring.NewBitmap()
	bm.DirectAdd(0)
	buf := &bytes.Buffer{}
	bm.WriteTo(buf)
	data := buf.Bytes()

	eg := errgroup.Group{}
	for i := uint64(0); i < 20; i++ {
		i := i
		eg.Go(func() error {
			for j := i; j < 10000; j += 20 {
				if (j-i)%1000 == 0 {
					fmt.Printf("%d is %.2f%% done.\n", i, float64(j-i)*100/100000)
				}
				err := cluster[i%5].API.ImportRoaring(context.Background(), "testidx", "testfield", j, false, &pilosa.ImportRoaringRequest{
					Views: map[string][]byte{
						"": data,
					},
				})
				if err != nil {
					return err
				}
			}
			return nil
		})
	}
	err := eg.Wait()
	if err != nil {
		t.Fatalf("setting lots of shards: %v", err)
	}
}