Collecting volume locations for volumes before EC encoding

fix https://github.com/seaweedfs/seaweedfs/issues/6963

weed/shell/command_ec_encode.go

@@ -4,10 +4,11 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/storage/types"
 	"io"
 	"time"
 
+	"github.com/seaweedfs/seaweedfs/weed/storage/types"
+
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
@@ -115,6 +116,14 @@ func (c *commandEcEncode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 		balanceCollections = []string{*collection}
 	}
 
+	// Collect volume locations BEFORE EC encoding starts to avoid race condition
+	// where the master metadata is updated after EC encoding but before deletion
+	fmt.Printf("Collecting volume locations for %d volumes before EC encoding...\n", len(volumeIds))
+	volumeLocationsMap, err := volumeLocations(commandEnv, volumeIds)
+	if err != nil {
+		return fmt.Errorf("failed to collect volume locations before EC encoding: %v", err)
+	}
+
 	// encode all requested volumes...
 	if err = doEcEncode(commandEnv, *collection, volumeIds, *maxParallelization); err != nil {
 		return fmt.Errorf("ec encode for volumes %v: %v", volumeIds, err)
@@ -123,10 +132,12 @@ func (c *commandEcEncode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 	if err := EcBalance(commandEnv, balanceCollections, "", rp, *maxParallelization, *applyBalancing); err != nil {
 		return fmt.Errorf("re-balance ec shards for collection(s) %v: %v", balanceCollections, err)
 	}
-	// ...then delete original volumes.
-	if err := doDeleteVolumes(commandEnv, volumeIds, *maxParallelization); err != nil {
-		return fmt.Errorf("re-balance ec shards for collection(s) %v: %v", balanceCollections, err)
+	// ...then delete original volumes using pre-collected locations.
+	fmt.Printf("Deleting original volumes after EC encoding...\n")
+	if err := doDeleteVolumesWithLocations(commandEnv, volumeIds, volumeLocationsMap, *maxParallelization); err != nil {
+		return fmt.Errorf("delete original volumes after EC encoding: %v", err)
 	}
+	fmt.Printf("Successfully completed EC encoding for %d volumes\n", len(volumeIds))
 
 	return nil
 }
@@ -150,7 +161,7 @@ func doEcEncode(commandEnv *CommandEnv, collection string, volumeIds []needle.Vo
 	}
 	locations, err := volumeLocations(commandEnv, volumeIds)
 	if err != nil {
-		return nil
+		return fmt.Errorf("failed to get volume locations for EC encoding: %v", err)
 	}
 
 	// mark volumes as readonly
@@ -207,18 +218,22 @@ func doEcEncode(commandEnv *CommandEnv, collection string, volumeIds []needle.Vo
 	return nil
 }
 
-func doDeleteVolumes(commandEnv *CommandEnv, volumeIds []needle.VolumeId, maxParallelization int) error {
+// doDeleteVolumesWithLocations deletes volumes using pre-collected location information
+// This avoids race conditions where master metadata is updated after EC encoding
+func doDeleteVolumesWithLocations(commandEnv *CommandEnv, volumeIds []needle.VolumeId, volumeLocationsMap map[needle.VolumeId][]wdclient.Location, maxParallelization int) error {
 	if !commandEnv.isLocked() {
 		return fmt.Errorf("lock is lost")
 	}
-	locations, err := volumeLocations(commandEnv, volumeIds)
-	if err != nil {
-		return nil
-	}
 
 	ewg := NewErrorWaitGroup(maxParallelization)
 	for _, vid := range volumeIds {
-		for _, l := range locations[vid] {
+		locations, found := volumeLocationsMap[vid]
+		if !found {
+			fmt.Printf("warning: no locations found for volume %d, skipping deletion\n", vid)
+			continue
+		}
+
+		for _, l := range locations {
 			ewg.Add(func() error {
 				if err := deleteVolume(commandEnv.option.GrpcDialOption, vid, l.ServerAddress(), false); err != nil {
 					return fmt.Errorf("deleteVolume %s volume %d: %v", l.Url, vid, err)