[exporter/doris] Send json lines to doris rather than json array (#36912

)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description 
Send json lines to doris rather than json array.

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes #36896

<!--Describe what testing was performed and which tests were added.-->
#### Testing
unit test

<!--Describe the documentation added.-->
#### Documentation

<!--Please delete paragraphs that you did not use before submitting.-->

.chloggen/json_line.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: dorisexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: send json lines to doris rather than json array
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [36896]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/dorisexporter/exporter_common.go

@@ -7,6 +7,7 @@ import (
 	"bytes"
 	"context"
 	"database/sql"
+	"encoding/json"
 	"fmt"
 	"net/http"
 	"time"
@@ -81,7 +82,7 @@ func streamLoadRequest(ctx context.Context, cfg *Config, table string, data []by
 
 	req.Header.Set("format", "json")
 	req.Header.Set("Expect", "100-continue")
-	req.Header.Set("strip_outer_array", "true")
+	req.Header.Set("read_json_by_line", "true")
 	if cfg.ClientConfig.Timeout != 0 {
 		req.Header.Set("timeout", fmt.Sprintf("%d", cfg.ClientConfig.Timeout/time.Second))
 	}
@@ -118,3 +119,19 @@ func createAndUseDatabase(ctx context.Context, conn *sql.DB, cfg *Config) error
 	_, err = conn.ExecContext(ctx, "USE "+cfg.Database)
 	return err
 }
+
+type metric interface {
+	dMetricGauge | dMetricSum | dMetricHistogram | dMetricExponentialHistogram | dMetricSummary
+}
+
+func toJsonLines[T dLog | dTrace | metric](data []*T) ([]byte, error) {
+	buf := &bytes.Buffer{}
+	enc := json.NewEncoder(buf)
+	for _, d := range data {
+		err := enc.Encode(d)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return buf.Bytes(), nil
+}

exporter/dorisexporter/exporter_common_test.go

@@ -5,6 +5,7 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	"net"
+	"strings"
 	"testing"
 	"time"
 
@@ -60,3 +61,11 @@ func findRandomPort() (int, error) {
 
 	return port, nil
 }
+
+func TestToJsonLines(t *testing.T) {
+	logs, err := toJsonLines([]*dLog{
+		{}, {},
+	})
+	require.NoError(t, err)
+	require.Len(t, strings.Split(string(logs), "\n"), 2+1)
+}

exporter/dorisexporter/exporter_logs.go

@@ -122,7 +122,7 @@ func (e *logsExporter) pushLogData(ctx context.Context, ld plog.Logs) error {
 }
 
 func (e *logsExporter) pushLogDataInternal(ctx context.Context, logs []*dLog) error {
-	marshal, err := json.Marshal(logs)
+	marshal, err := toJsonLines(logs)
 	if err != nil {
 		return err
 	}

exporter/dorisexporter/exporter_traces.go

@@ -180,7 +180,7 @@ func (e *tracesExporter) pushTraceData(ctx context.Context, td ptrace.Traces) er
 }
 
 func (e *tracesExporter) pushTraceDataInternal(ctx context.Context, traces []*dTrace) error {
-	marshal, err := json.Marshal(traces)
+	marshal, err := toJsonLines(traces)
 	if err != nil {
 		return err
 	}

exporter/dorisexporter/metrics_exponential_histogram.go

@@ -5,7 +5,6 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	_ "embed"
-	"encoding/json"
 	"fmt"
 
 	"go.opentelemetry.io/collector/pdata/pmetric"
@@ -118,5 +117,5 @@ func (m *metricModelExponentialHistogram) size() int {
 }
 
 func (m *metricModelExponentialHistogram) bytes() ([]byte, error) {
-	return json.Marshal(m.data)
+	return toJsonLines(m.data)
 }

exporter/dorisexporter/metrics_gauge.go

@@ -5,7 +5,6 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	_ "embed"
-	"encoding/json"
 	"fmt"
 
 	"go.opentelemetry.io/collector/pdata/pmetric"
@@ -84,5 +83,5 @@ func (m *metricModelGauge) size() int {
 }
 
 func (m *metricModelGauge) bytes() ([]byte, error) {
-	return json.Marshal(m.data)
+	return toJsonLines(m.data)
 }

exporter/dorisexporter/metrics_histogram.go

@@ -5,7 +5,6 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	_ "embed"
-	"encoding/json"
 	"fmt"
 
 	"go.opentelemetry.io/collector/pdata/pmetric"
@@ -108,5 +107,5 @@ func (m *metricModelHistogram) size() int {
 }
 
 func (m *metricModelHistogram) bytes() ([]byte, error) {
-	return json.Marshal(m.data)
+	return toJsonLines(m.data)
 }

exporter/dorisexporter/metrics_sum.go

@@ -5,7 +5,6 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	_ "embed"
-	"encoding/json"
 	"fmt"
 
 	"go.opentelemetry.io/collector/pdata/pmetric"
@@ -88,5 +87,5 @@ func (m *metricModelSum) size() int {
 }
 
 func (m *metricModelSum) bytes() ([]byte, error) {
-	return json.Marshal(m.data)
+	return toJsonLines(m.data)
 }

exporter/dorisexporter/metrics_summary.go

@@ -5,7 +5,6 @@ package dorisexporter // import "github.com/open-telemetry/opentelemetry-collect
 
 import (
 	_ "embed"
-	"encoding/json"
 	"fmt"
 
 	"go.opentelemetry.io/collector/pdata/pmetric"
@@ -89,5 +88,5 @@ func (m *metricModelSummary) size() int {
 }
 
 func (m *metricModelSummary) bytes() ([]byte, error) {
-	return json.Marshal(m.data)
+	return toJsonLines(m.data)
 }