1 files changed, 198 insertions, 0 deletions
diff --git a/weed/shell/command_ec_common.go b/weed/shell/command_ec_common.go
new file mode 100644
index 000000000..0cbf694cd
--- /dev/null
+++ b/weed/shell/command_ec_common.go
@@ -0,0 +1,198 @@
+package shell
+
+import (
+	"context"
+	"fmt"
+	"sort"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"google.golang.org/grpc"
+)
+
+func moveMountedShardToEcNode(ctx context.Context, commandEnv *commandEnv, existingLocation *EcNode, collection string, vid needle.VolumeId, shardId erasure_coding.ShardId, destinationEcNode *EcNode, applyBalancing bool) error {
+
+	fmt.Printf("moved ec shard %d.%d %s => %s\n", vid, shardId, existingLocation.info.Id, destinationEcNode.info.Id)
+
+	if !applyBalancing {
+		return nil
+	}
+
+	// ask destination node to copy shard and the ecx file from source node, and mount it
+	copiedShardIds, err := oneServerCopyAndMountEcShardsFromSource(ctx, commandEnv.option.GrpcDialOption, destinationEcNode, uint32(shardId), 1, vid, collection, existingLocation.info.Id)
+	if err != nil {
+		return err
+	}
+
+	// unmount the to be deleted shards
+	err = unmountEcShards(ctx, commandEnv.option.GrpcDialOption, vid, existingLocation.info.Id, copiedShardIds)
+	if err != nil {
+		return err
+	}
+
+	// ask source node to delete the shard, and maybe the ecx file
+	return sourceServerDeleteEcShards(ctx, commandEnv.option.GrpcDialOption, collection, vid, existingLocation.info.Id, copiedShardIds)
+
+}
+
+func oneServerCopyAndMountEcShardsFromSource(ctx context.Context, grpcDialOption grpc.DialOption,
+	targetServer *EcNode, startFromShardId uint32, shardCount int,
+	volumeId needle.VolumeId, collection string, existingLocation string) (copiedShardIds []uint32, err error) {
+
+	var shardIdsToCopy []uint32
+	for shardId := startFromShardId; shardId < startFromShardId+uint32(shardCount); shardId++ {
+		shardIdsToCopy = append(shardIdsToCopy, shardId)
+	}
+	fmt.Printf("allocate %d.%v %s => %s\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id)
+
+	err = operation.WithVolumeServerClient(targetServer.info.Id, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+
+		if targetServer.info.Id != existingLocation {
+
+			fmt.Printf("copy %d.%v %s => %s\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id)
+			_, copyErr := volumeServerClient.VolumeEcShardsCopy(ctx, &volume_server_pb.VolumeEcShardsCopyRequest{
+				VolumeId:       uint32(volumeId),
+				Collection:     collection,
+				ShardIds:       shardIdsToCopy,
+				CopyEcxFile:    true,
+				SourceDataNode: existingLocation,
+			})
+			if copyErr != nil {
+				return copyErr
+			}
+		}
+
+		fmt.Printf("mount %d.%v on %s\n", volumeId, shardIdsToCopy, targetServer.info.Id)
+		_, mountErr := volumeServerClient.VolumeEcShardsMount(ctx, &volume_server_pb.VolumeEcShardsMountRequest{
+			VolumeId:   uint32(volumeId),
+			Collection: collection,
+			ShardIds:   shardIdsToCopy,
+		})
+		if mountErr != nil {
+			return mountErr
+		}
+
+		if targetServer.info.Id != existingLocation {
+			copiedShardIds = shardIdsToCopy
+			glog.V(0).Infof("%s ec volume %d deletes shards %+v", existingLocation, volumeId, copiedShardIds)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+func eachDataNode(topo *master_pb.TopologyInfo, fn func(*master_pb.DataNodeInfo)) {
+	for _, dc := range topo.DataCenterInfos {
+		for _, rack := range dc.RackInfos {
+			for _, dn := range rack.DataNodeInfos {
+				fn(dn)
+			}
+		}
+	}
+}
+
+func sortEcNodes(ecNodes []*EcNode) {
+	sort.Slice(ecNodes, func(i, j int) bool {
+		return ecNodes[i].freeEcSlot > ecNodes[j].freeEcSlot
+	})
+}
+
+func countShards(ecShardInfos []*master_pb.VolumeEcShardInformationMessage) (count int) {
+	for _, ecShardInfo := range ecShardInfos {
+		shardBits := erasure_coding.ShardBits(ecShardInfo.EcIndexBits)
+		count += shardBits.ShardIdCount()
+	}
+	return
+}
+
+func countFreeShardSlots(dn *master_pb.DataNodeInfo) (count int) {
+	return int(dn.FreeVolumeCount)*10 - countShards(dn.EcShardInfos)
+}
+
+type EcNode struct {
+	info       *master_pb.DataNodeInfo
+	freeEcSlot int
+}
+
+func collectEcNodes(ctx context.Context, commandEnv *commandEnv) (ecNodes []*EcNode, totalFreeEcSlots int, err error) {
+
+	// list all possible locations
+	var resp *master_pb.VolumeListResponse
+	err = commandEnv.masterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
+		resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{})
+		return err
+	})
+	if err != nil {
+		return nil, 0, err
+	}
+
+	// find out all volume servers with one slot left.
+	eachDataNode(resp.TopologyInfo, func(dn *master_pb.DataNodeInfo) {
+		if freeEcSlots := countFreeShardSlots(dn); freeEcSlots > 0 {
+			ecNodes = append(ecNodes, &EcNode{
+				info:       dn,
+				freeEcSlot: int(freeEcSlots),
+			})
+			totalFreeEcSlots += freeEcSlots
+		}
+	})
+
+	sortEcNodes(ecNodes)
+
+	return
+}
+
+func sourceServerDeleteEcShards(ctx context.Context, grpcDialOption grpc.DialOption,
+	collection string, volumeId needle.VolumeId, sourceLocation string, toBeDeletedShardIds []uint32) error {
+
+	fmt.Printf("delete %d.%v from %s\n", volumeId, toBeDeletedShardIds, sourceLocation)
+
+	return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, deleteErr := volumeServerClient.VolumeEcShardsDelete(ctx, &volume_server_pb.VolumeEcShardsDeleteRequest{
+			VolumeId:   uint32(volumeId),
+			Collection: collection,
+			ShardIds:   toBeDeletedShardIds,
+		})
+		return deleteErr
+	})
+
+}
+
+func unmountEcShards(ctx context.Context, grpcDialOption grpc.DialOption,
+	volumeId needle.VolumeId, sourceLocation string, toBeUnmountedhardIds []uint32) error {
+
+	fmt.Printf("unmount %d.%v from %s\n", volumeId, toBeUnmountedhardIds, sourceLocation)
+
+	return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, deleteErr := volumeServerClient.VolumeEcShardsUnmount(ctx, &volume_server_pb.VolumeEcShardsUnmountRequest{
+			VolumeId: uint32(volumeId),
+			ShardIds: toBeUnmountedhardIds,
+		})
+		return deleteErr
+	})
+}
+
+func mountEcShards(ctx context.Context, grpcDialOption grpc.DialOption,
+	collection string, volumeId needle.VolumeId, sourceLocation string, toBeMountedhardIds []uint32) error {
+
+	fmt.Printf("mount %d.%v on %s\n", volumeId, toBeMountedhardIds, sourceLocation)
+
+	return operation.WithVolumeServerClient(sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		_, mountErr := volumeServerClient.VolumeEcShardsMount(ctx, &volume_server_pb.VolumeEcShardsMountRequest{
+			VolumeId:   uint32(volumeId),
+			Collection: collection,
+			ShardIds:   toBeMountedhardIds,
+		})
+		return mountErr
+	})
+}