// Ensures the points writer maps a single point to a single shard.
func TestPointsWriter_MapShards_One(t *testing.T) {
ms := PointsWriterMetaClient{}
rp := NewRetentionPolicy("myp", time.Hour, 3)
ms.NodeIDFn = func() uint64 { return 1 }
ms.RetentionPolicyFn = func(db, retentionPolicy string) (*meta.RetentionPolicyInfo, error) {
return rp, nil
}
ms.CreateShardGroupIfNotExistsFn = func(database, policy string, timestamp time.Time) (*meta.ShardGroupInfo, error) {
return &rp.ShardGroups[0], nil
}
c := coordinator.PointsWriter{MetaClient: ms}
pr := &coordinator.WritePointsRequest{
Database: "mydb",
RetentionPolicy: "myrp",
}
pr.AddPoint("cpu", 1.0, time.Now(), nil)
var (
shardMappings *coordinator.ShardMapping
err error
)
if shardMappings, err = c.MapShards(pr); err != nil {
t.Fatalf("unexpected an error: %v", err)
}
if exp := 1; len(shardMappings.Points) != exp {
t.Errorf("MapShards() len mismatch. got %v, exp %v", len(shardMappings.Points), exp)
}
}
// Ensures the points writer maps a multiple points across shard group boundaries.
func TestPointsWriter_MapShards_Multiple(t *testing.T) {
ms := PointsWriterMetaClient{}
rp := NewRetentionPolicy("myp", time.Hour, 3)
AttachShardGroupInfo(rp, []meta.ShardOwner{
{NodeID: 1},
{NodeID: 2},
{NodeID: 3},
})
AttachShardGroupInfo(rp, []meta.ShardOwner{
{NodeID: 1},
{NodeID: 2},
{NodeID: 3},
})
ms.NodeIDFn = func() uint64 { return 1 }
ms.RetentionPolicyFn = func(db, retentionPolicy string) (*meta.RetentionPolicyInfo, error) {
return rp, nil
}
ms.CreateShardGroupIfNotExistsFn = func(database, policy string, timestamp time.Time) (*meta.ShardGroupInfo, error) {
for i, sg := range rp.ShardGroups {
if timestamp.Equal(sg.StartTime) || timestamp.After(sg.StartTime) && timestamp.Before(sg.EndTime) {
return &rp.ShardGroups[i], nil
}
}
panic("should not get here")
}
c := coordinator.PointsWriter{MetaClient: ms}
pr := &coordinator.WritePointsRequest{
Database: "mydb",
RetentionPolicy: "myrp",
}
// Three points that range over the shardGroup duration (1h) and should map to two
// distinct shards
pr.AddPoint("cpu", 1.0, time.Unix(0, 0), nil)
pr.AddPoint("cpu", 2.0, time.Unix(0, 0).Add(time.Hour), nil)
pr.AddPoint("cpu", 3.0, time.Unix(0, 0).Add(time.Hour+time.Second), nil)
var (
shardMappings *coordinator.ShardMapping
err error
)
if shardMappings, err = c.MapShards(pr); err != nil {
t.Fatalf("unexpected an error: %v", err)
}
if exp := 2; len(shardMappings.Points) != exp {
t.Errorf("MapShards() len mismatch. got %v, exp %v", len(shardMappings.Points), exp)
}
for _, points := range shardMappings.Points {
// First shard shoud have 1 point w/ first point added
if len(points) == 1 && points[0].Time() != pr.Points[0].Time() {
t.Fatalf("MapShards() value mismatch. got %v, exp %v", points[0].Time(), pr.Points[0].Time())
}
// Second shard shoud have the last two points added
if len(points) == 2 && points[0].Time() != pr.Points[1].Time() {
t.Fatalf("MapShards() value mismatch. got %v, exp %v", points[0].Time(), pr.Points[1].Time())
}
if len(points) == 2 && points[1].Time() != pr.Points[2].Time() {
t.Fatalf("MapShards() value mismatch. got %v, exp %v", points[1].Time(), pr.Points[2].Time())
}
}
}