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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 fmt.Errorf("copy %d.%v %s => %s : %v\n", volumeId, shardIdsToCopy, existingLocation, targetServer.info.Id, 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 fmt.Errorf("mount %d.%v on %s : %v\n", volumeId, shardIdsToCopy, targetServer.info.Id, 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
})
}
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