Add root path in minio and replace etcd.rootPath in datanode (#8272)

issue: #7905
Signed-off-by: sunby <bingyi.sun@zilliz.com>

configs/milvus.yaml

@@ -29,6 +29,7 @@ minio:
   secretAccessKey: minioadmin
   useSSL: false
   bucketName: "a-bucket"
+  rootPath: files
 
 pulsar:
   address: localhost

internal/datanode/param_table.go

@@ -143,7 +143,7 @@ func (p *ParamTable) initFlushInsertBufferSize() {
 
 func (p *ParamTable) initInsertBinlogRootPath() {
 	// GOOSE TODO: rootPath change to  TenentID
-	rootPath, err := p.Load("etcd.rootPath")
+	rootPath, err := p.Load("minio.rootPath")
 	if err != nil {
 		panic(err)
 	}
@@ -151,7 +151,7 @@ func (p *ParamTable) initInsertBinlogRootPath() {
 }
 
 func (p *ParamTable) initStatsBinlogRootPath() {
-	rootPath, err := p.Load("etcd.rootPath")
+	rootPath, err := p.Load("minio.rootPath")
 	if err != nil {
 		panic(err)
 	}

internal/datanode/param_table_test.go

@@ -13,6 +13,7 @@ package datanode
 
 import (
 	"log"
+	"path"
 	"testing"
 	"time"
 
@@ -122,4 +123,15 @@ func TestParamTable(t *testing.T) {
 		Params.UpdatedTime = time.Now()
 		log.Println("UpdatedTime: ", Params.UpdatedTime)
 	})
+
+	t.Run("Test InsertBinlogRootPath", func(t *testing.T) {
+		Params.Init()
+		assert.Equal(t, path.Join("files", "insert_log"), Params.InsertBinlogRootPath)
+	})
+
+	t.Run("Test StatsBinlogRootPath", func(t *testing.T) {
+		p := new(ParamTable)
+		p.Init()
+		assert.Equal(t, path.Join("files", "stats_log"), Params.StatsBinlogRootPath)
+	})
 }