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package topology
import (
"math"
"sort"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
)
const shardCount = erasure_coding.DataShardsCount + erasure_coding.ParityShardsCount
type EcShardLocations struct {
Collection string
locations [shardCount][]*DataNode
}
func (t *Topology) SyncDataNodeEcShards(shardInfos []*master_pb.VolumeEcShardInformationMessage, dn *DataNode) (newShards, deletedShards []*erasure_coding.EcVolumeInfo) {
// convert into in memory struct storage.VolumeInfo
var shards []*erasure_coding.EcVolumeInfo
sort.Slice(shardInfos, func(i, j int) bool {
return shardInfos[i].Id < shardInfos[j].Id
})
prevVolumeId := uint32(math.MaxUint32)
var ecVolumeInfo *erasure_coding.EcVolumeInfo
for _, shardInfo := range shardInfos {
if shardInfo.Id != prevVolumeId {
ecVolumeInfo = erasure_coding.NewEcVolumeInfo(shardInfo.Collection, needle.VolumeId(shardInfo.Id))
shards = append(shards, ecVolumeInfo)
}
prevVolumeId = shardInfo.Id
ecVolumeInfo.AddShardId(erasure_coding.ShardId(shardInfo.EcIndex))
}
// find out the delta volumes
newShards, deletedShards = dn.UpdateEcShards(shards)
for _, v := range newShards {
t.RegisterEcShards(v, dn)
}
for _, v := range deletedShards {
t.UnRegisterEcShards(v, dn)
}
return
}
func NewEcShardLocations(collection string) *EcShardLocations {
return &EcShardLocations{
Collection: collection,
}
}
func (loc *EcShardLocations) AddShard(shardId erasure_coding.ShardId, dn *DataNode) (added bool) {
dataNodes := loc.locations[shardId]
for _, n := range dataNodes {
if n.Id() == dn.Id() {
return false
}
}
loc.locations[shardId] = append(dataNodes, dn)
return true
}
func (loc *EcShardLocations) DeleteShard(shardId erasure_coding.ShardId, dn *DataNode) (deleted bool) {
dataNodes := loc.locations[shardId]
foundIndex := -1
for index, n := range dataNodes {
if n.Id() == dn.Id() {
foundIndex = index
}
}
if foundIndex < 0 {
return false
}
loc.locations[shardId] = append(dataNodes[:foundIndex], dataNodes[foundIndex+1:]...)
return true
}
func (t *Topology) RegisterEcShards(ecShardInfos *erasure_coding.EcVolumeInfo, dn *DataNode) {
t.ecShardMapLock.Lock()
defer t.ecShardMapLock.Unlock()
locations, found := t.ecShardMap[ecShardInfos.VolumeId]
if !found {
locations = NewEcShardLocations(ecShardInfos.Collection)
t.ecShardMap[ecShardInfos.VolumeId] = locations
}
for _, shardId := range ecShardInfos.ShardIds() {
locations.AddShard(shardId, dn)
}
}
func (t *Topology) UnRegisterEcShards(ecShardInfos *erasure_coding.EcVolumeInfo, dn *DataNode) {
glog.Infof("removing ec shard info:%+v", ecShardInfos)
t.ecShardMapLock.Lock()
defer t.ecShardMapLock.Unlock()
locations, found := t.ecShardMap[ecShardInfos.VolumeId]
if !found {
return
}
for _, shardId := range ecShardInfos.ShardIds() {
locations.DeleteShard(shardId, dn)
}
}
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