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resolve concurrent modification problem

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n and err can be modified concurrently
This commit is contained in:
Chris Lu
2019-05-30 13:59:07 -07:00
parent f53024d79d
commit aaab2c25f5
1 changed files with 10 additions and 9 deletions
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19
weed/storage/store_ec.go
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@@ -157,11 +157,8 @@ func (s *Store) readOneEcShardInterval(ctx context.Context, ecVolume *erasure_co
}
} else {
ecVolume.ShardLocationsLock.RLock()
sourceDataNodes, found := ecVolume.ShardLocations[shardId]
sourceDataNodes, _ := ecVolume.ShardLocations[shardId]
ecVolume.ShardLocationsLock.RUnlock()
if !found || len(sourceDataNodes) == 0 {
return nil, fmt.Errorf("failed to find ec shard %d.%d", ecVolume.VolumeId, shardId)
}
// try reading directly
_, err = s.readRemoteEcShardInterval(ctx, sourceDataNodes, ecVolume.VolumeId, shardId, data, actualOffset)
@@ -215,6 +212,10 @@ func (s *Store) cachedLookupEcShardLocations(ctx context.Context, ecVolume *eras
func (s *Store) readRemoteEcShardInterval(ctx context.Context, sourceDataNodes []string, vid needle.VolumeId, shardId erasure_coding.ShardId, buf []byte, offset int64) (n int, err error) {
if len(sourceDataNodes) == 0 {
return 0, fmt.Errorf("failed to find ec shard %d.%d", vid, shardId)
}
for _, sourceDataNode := range sourceDataNodes {
glog.V(4).Infof("read remote ec shard %d.%d from %s", vid, shardId, sourceDataNode)
n, err = s.doReadRemoteEcShardInterval(ctx, sourceDataNode, vid, shardId, buf, offset)
@@ -291,13 +292,12 @@ func (s *Store) recoverOneRemoteEcShardInterval(ctx context.Context, ecVolume *e
go func(shardId erasure_coding.ShardId, locations []string) {
defer wg.Done()
data := make([]byte, len(buf))
n, err = s.readRemoteEcShardInterval(ctx, locations, ecVolume.VolumeId, shardId, data, offset)
if err != nil {
glog.V(3).Infof("readRemoteEcShardInterval %d.%d from %+v", ecVolume.VolumeId, shardId, locations)
nRead, readErr := s.readRemoteEcShardInterval(ctx, locations, ecVolume.VolumeId, shardId, data, offset)
if readErr != nil {
glog.V(4).Infof("recover: readRemoteEcShardInterval %d.%d %d bytes from %+v: %v", ecVolume.VolumeId, shardId, nRead, locations, readErr)
}
if n == len(buf) {
if nRead == len(buf) {
bufs[shardId] = data
return
}
}(shardId, locations)
}
@@ -306,6 +306,7 @@ func (s *Store) recoverOneRemoteEcShardInterval(ctx context.Context, ecVolume *e
wg.Wait()
if err = enc.ReconstructData(bufs); err != nil {
glog.V(3).Infof("recovered ec shard %d.%d failed: %v", ecVolume.VolumeId, shardIdToRecover, err)
return 0, err
}
glog.V(3).Infof("recovered ec shard %d.%d from other locations", ecVolume.VolumeId, shardIdToRecover)