Prune wdclient Functions (#8855)

* chore(weed/wdclient): prune unused functions

* chore(weed/wdclient): prune test-only functions and associated tests

* chore(weed/wdclient): remove dead cursor field

The cursor field and its initialization are no longer used after
the removal of getLocationIndex.

---------

Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/wdclient/filer_client.go

@@ -503,55 +503,17 @@ func (fc *FilerClient) shouldSkipUnhealthyFilerWithHealth(health *filerHealth) b
 	return true // Skip this unhealthy filer
 }
 
-// Deprecated: Use shouldSkipUnhealthyFilerWithHealth instead
-// This function is kept for backward compatibility but requires array access
-// Note: This function is now thread-safe.
-func (fc *FilerClient) shouldSkipUnhealthyFiler(index int32) bool {
-	fc.filerAddressesMu.RLock()
-	if index >= int32(len(fc.filerHealth)) {
-		fc.filerAddressesMu.RUnlock()
-		return true // Invalid index - skip
-	}
-	health := fc.filerHealth[index]
-	fc.filerAddressesMu.RUnlock()
-	return fc.shouldSkipUnhealthyFilerWithHealth(health)
-}
-
 // recordFilerSuccessWithHealth resets failure tracking for a successful filer
 func (fc *FilerClient) recordFilerSuccessWithHealth(health *filerHealth) {
 	atomic.StoreInt32(&health.failureCount, 0)
 }
 
-// recordFilerSuccess resets failure tracking for a successful filer
-func (fc *FilerClient) recordFilerSuccess(index int32) {
-	fc.filerAddressesMu.RLock()
-	if index >= int32(len(fc.filerHealth)) {
-		fc.filerAddressesMu.RUnlock()
-		return // Invalid index
-	}
-	health := fc.filerHealth[index]
-	fc.filerAddressesMu.RUnlock()
-	fc.recordFilerSuccessWithHealth(health)
-}
-
 // recordFilerFailureWithHealth increments failure count for an unhealthy filer
 func (fc *FilerClient) recordFilerFailureWithHealth(health *filerHealth) {
 	atomic.AddInt32(&health.failureCount, 1)
 	atomic.StoreInt64(&health.lastFailureTimeNs, time.Now().UnixNano())
 }
 
-// recordFilerFailure increments failure count for an unhealthy filer
-func (fc *FilerClient) recordFilerFailure(index int32) {
-	fc.filerAddressesMu.RLock()
-	if index >= int32(len(fc.filerHealth)) {
-		fc.filerAddressesMu.RUnlock()
-		return // Invalid index
-	}
-	health := fc.filerHealth[index]
-	fc.filerAddressesMu.RUnlock()
-	fc.recordFilerFailureWithHealth(health)
-}
-
 // LookupVolumeIds queries the filer for volume locations with automatic failover
 // Tries all configured filer addresses until one succeeds (high availability)
 // Retries transient gRPC errors (Unavailable, DeadlineExceeded, etc.) with exponential backoff

weed/wdclient/vid_map.go

@@ -15,10 +15,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 )
 
-const (
-	maxCursorIndex = 4096
-)
-
 type HasLookupFileIdFunction interface {
 	GetLookupFileIdFunction() LookupFileIdFunctionType
 }
@@ -41,7 +37,6 @@ type vidMap struct {
 	vid2Locations   map[uint32][]Location
 	ecVid2Locations map[uint32][]Location
 	DataCenter      string
-	cursor          int32
 	cache           atomic.Pointer[vidMap]
 }
 
@@ -50,18 +45,7 @@ func newVidMap(dataCenter string) *vidMap {
 		vid2Locations:   make(map[uint32][]Location),
 		ecVid2Locations: make(map[uint32][]Location),
 		DataCenter:      dataCenter,
-		cursor:          -1,
-	}
-}
-
-func (vc *vidMap) getLocationIndex(length int) (int, error) {
-	if length <= 0 {
-		return 0, fmt.Errorf("invalid length: %d", length)
-	}
-	if atomic.LoadInt32(&vc.cursor) == maxCursorIndex {
-		atomic.CompareAndSwapInt32(&vc.cursor, maxCursorIndex, -1)
 	}
-	return int(atomic.AddInt32(&vc.cursor, 1)) % length, nil
 }
 
 func (vc *vidMap) isSameDataCenter(loc *Location) bool {

weed/wdclient/vid_map_test.go

@@ -2,7 +2,6 @@ package wdclient
 
 import (
 	"context"
-	"fmt"
 	"strconv"
 	"sync"
 	"testing"
@@ -12,60 +11,6 @@ import (
 	"google.golang.org/grpc"
 )
 
-func TestLocationIndex(t *testing.T) {
-	vm := &vidMap{}
-	// test must be failed
-	mustFailed := func(length int) {
-		_, err := vm.getLocationIndex(length)
-		if err == nil {
-			t.Errorf("length %d must be failed", length)
-		}
-		if err.Error() != fmt.Sprintf("invalid length: %d", length) {
-			t.Errorf("length %d must be failed. error: %v", length, err)
-		}
-	}
-
-	mustFailed(-1)
-	mustFailed(0)
-
-	mustOk := func(length, cursor, expect int) {
-		if length <= 0 {
-			t.Fatal("please don't do this")
-		}
-		vm.cursor = int32(cursor)
-		got, err := vm.getLocationIndex(length)
-		if err != nil {
-			t.Errorf("length: %d, why? %v\n", length, err)
-			return
-		}
-		if got != expect {
-			t.Errorf("cursor: %d, length: %d, expect: %d, got: %d\n", cursor, length, expect, got)
-			return
-		}
-	}
-
-	for i := -1; i < 100; i++ {
-		mustOk(7, i, (i+1)%7)
-	}
-
-	// when cursor reaches MaxInt64
-	mustOk(7, maxCursorIndex, 0)
-
-	// test with constructor
-	vm = newVidMap("")
-	length := 7
-	for i := 0; i < 100; i++ {
-		got, err := vm.getLocationIndex(length)
-		if err != nil {
-			t.Errorf("length: %d, why? %v\n", length, err)
-			return
-		}
-		if got != i%length {
-			t.Errorf("length: %d, i: %d, got: %d\n", length, i, got)
-		}
-	}
-}
-
 func TestLookupFileId(t *testing.T) {
 	mc := NewMasterClient(grpc.EmptyDialOption{}, "", "", "", "", "", pb.ServerDiscovery{})
 	length := 5
@@ -172,19 +117,3 @@ func TestConcurrentGetLocations(t *testing.T) {
 	cancel()
 	wg.Wait()
 }
-
-func BenchmarkLocationIndex(b *testing.B) {
-	b.SetParallelism(8)
-	vm := vidMap{
-		cursor: maxCursorIndex - 4000,
-	}
-	b.ResetTimer()
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			_, err := vm.getLocationIndex(3)
-			if err != nil {
-				b.Error(err)
-			}
-		}
-	})
-}