fix comment

Signed-off-by: okJiang <[email protected]>

client/caller/constant.go

@@ -15,29 +15,29 @@
 package caller
 
 type (
-	// ID represents the caller ID.
+	// Caller ID can be understood as a binary file; it is a process.
 	ID string
-	// Component represents the caller component.
+	// Caller component refers to the components within the process.
 	Component string
 )
 
 // nolint:exported
 const (
 	Unknown   ID = "unknown"
-	Tidb      ID = "tidb"
-	Pd        ID = "pd"
-	Tikv      ID = "tikv"
+	TiDB      ID = "tidb"
+	PD        ID = "pd"
+	TiKV      ID = "tikv"
 	TiFlash   ID = "tiflash"
 	Lightning ID = "lightning"
 	Dumpling  ID = "dumpling"
-	Br        ID = "br"
-	Dm        ID = "dm"
-	Cdc       ID = "cdc"
+	BR        ID = "br"
+	DM        ID = "dm"
+	CDC       ID = "cdc"
 	Operator  ID = "operator"
 	Dashboard ID = "dashboard"
 
 	// If the component you used is not in the list, please add it here.
-	Ddl Component = "ddl"
+	DDL Component = "ddl"
 
 	// TestID is used for test.
 	TestID ID = "test"

client/client.go

@@ -142,8 +142,10 @@ type RPCClient interface {
 	SetExternalTimestamp(ctx context.Context, timestamp uint64) error
 
 	// WithCallerID returns a new RPCClient with the specified caller ID.
+	// Caller ID can be understood as a binary file; it is a process.
 	WithCallerID(callerID caller.ID) RPCClient
 	// WithCallerComponent returns a new RPCClient with the specified caller component.
+	// Caller component refers to the components within the process.
 	WithCallerComponent(callerComponent caller.Component) RPCClient
 
 	// TSOClient is the TSO client.
@@ -217,7 +219,9 @@ func (k *serviceModeKeeper) close() {
 }
 
 type client struct {
-	callerID        caller.ID
+	// Caller ID can be understood as a binary file; it is a process.
+	callerID caller.ID
+	// Caller component refers to the components within the process.
 	callerComponent caller.Component
 
 	inner *innerClient