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Separate endpoint count data from network object 

Currently endpoint count is maintained as part of
network object and the endpoint count gets updated
frequently while the rest of network is quite stable.
Because of the frequent updates to endpoint count the
network object is getting marshalled and unmarshalled
ferquently. This is causing a lot of churn and transient
memory usage. Fix this by creating a deparate object of
endpoint count so that only that gets updated.

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
This commit is contained in:
Jana Radhakrishnan 2015-10-11 22:28:26 -07:00
parent a6c2dd75b5
commit ab8dfb54fe
6 changed files with 200 additions and 82 deletions
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32
libnetwork/controller.go
View File

@ -355,24 +355,30 @@ func (c *controller) NewNetwork(networkType, name string, options ...NetworkOpti
}
}()
// addNetwork can be called for local scope network lazily when
// an endpoint is created after a restart and the network was
// created in previous life. Make sure you wrap around the driver
// notification of network creation in once call so that the driver
// invoked only once in case both the network and endpoint creation
// happens in the same lifetime.
network.drvOnce.Do(func() {
err = c.addNetwork(network)
})
if err != nil {
if err := c.addNetwork(network); err != nil {
return nil, err
}
defer func() {
if err != nil {
if e := network.deleteNetwork(); e != nil {
log.Warnf("couldn't roll back driver network on network %s creation failure: %v", network.name, err)
}
}
}()
if err = c.updateToStore(network); err != nil {
log.Warnf("couldnt create network %s: %v", network.name, err)
if e := network.Delete(); e != nil {
log.Warnf("couldnt cleanup network %s on network create failure (%v): %v", network.name, err, e)
return nil, err
}
defer func() {
if err != nil {
if e := c.deleteFromStore(network); e != nil {
log.Warnf("couldnt rollback from store, network %s on failure (%v): %v", network.name, err, e)
}
}
}()
network.epCnt = &endpointCnt{n: network}
if err = c.updateToStore(network.epCnt); err != nil {
return nil, err
}

4
libnetwork/endpoint.go
View File

@ -484,12 +484,12 @@ func (ep *endpoint) Delete() error {
}
ep.Unlock()
if err = n.DecEndpointCnt(); err != nil {
if err = n.getEpCnt().DecEndpointCnt(); err != nil {
return err
}
defer func() {
if err != nil {
if e := n.IncEndpointCnt(); e != nil {
if e := n.getEpCnt().IncEndpointCnt(); e != nil {
log.Warnf("failed to update network %s : %v", n.name, e)
}
}

147
libnetwork/endpoint_cnt.go Normal file
View File

@ -0,0 +1,147 @@
package libnetwork
import (
"encoding/json"
"fmt"
"sync"
"github.com/docker/libnetwork/datastore"
)
type endpointCnt struct {
n *network
Count uint64
dbIndex uint64
dbExists bool
sync.Mutex
}
const epCntKeyPrefix = "endpoint_count"
func (ec *endpointCnt) Key() []string {
ec.Lock()
defer ec.Unlock()
return []string{epCntKeyPrefix, ec.n.id}
}
func (ec *endpointCnt) KeyPrefix() []string {
ec.Lock()
defer ec.Unlock()
return []string{epCntKeyPrefix, ec.n.id}
}
func (ec *endpointCnt) Value() []byte {
ec.Lock()
defer ec.Unlock()
b, err := json.Marshal(ec)
if err != nil {
return nil
}
return b
}
func (ec *endpointCnt) SetValue(value []byte) error {
ec.Lock()
defer ec.Unlock()
return json.Unmarshal(value, &ec)
}
func (ec *endpointCnt) Index() uint64 {
ec.Lock()
defer ec.Unlock()
return ec.dbIndex
}
func (ec *endpointCnt) SetIndex(index uint64) {
ec.Lock()
ec.dbIndex = index
ec.dbExists = true
ec.Unlock()
}
func (ec *endpointCnt) Exists() bool {
ec.Lock()
defer ec.Unlock()
return ec.dbExists
}
func (ec *endpointCnt) Skip() bool {
ec.Lock()
defer ec.Unlock()
return !ec.n.persist
}
func (ec *endpointCnt) New() datastore.KVObject {
ec.Lock()
defer ec.Unlock()
return &endpointCnt{
n: ec.n,
}
}
func (ec *endpointCnt) CopyTo(o datastore.KVObject) error {
ec.Lock()
defer ec.Unlock()
dstEc := o.(*endpointCnt)
dstEc.n = ec.n
dstEc.Count = ec.Count
dstEc.dbExists = ec.dbExists
dstEc.dbIndex = ec.dbIndex
return nil
}
func (ec *endpointCnt) DataScope() string {
return ec.n.DataScope()
}
func (ec *endpointCnt) EndpointCnt() uint64 {
ec.Lock()
defer ec.Unlock()
return ec.Count
}
func (ec *endpointCnt) atomicIncDecEpCnt(inc bool) error {
retry:
ec.Lock()
if inc {
ec.Count++
} else {
ec.Count--
}
ec.Unlock()
store := ec.n.getController().getStore(ec.DataScope())
if store == nil {
return fmt.Errorf("store not found for scope %s", ec.DataScope())
}
if err := ec.n.getController().updateToStore(ec); err != nil {
if err == datastore.ErrKeyModified {
if err := store.GetObject(datastore.Key(ec.Key()...), ec); err != nil {
return fmt.Errorf("could not update the kvobject to latest when trying to atomic add endpoint count: %v", err)
}
goto retry
}
return err
}
return nil
}
func (ec *endpointCnt) IncEndpointCnt() error {
return ec.atomicIncDecEpCnt(true)
}
func (ec *endpointCnt) DecEndpointCnt() error {
return ec.atomicIncDecEpCnt(false)
}

3
libnetwork/libnetwork_internal_test.go
View File

@ -39,7 +39,6 @@ func TestNetworkMarshalling(t *testing.T) {
ipamType: "default",
addrSpace: "viola",
networkType: "bridge",
endpointCnt: 27,
enableIPv6: true,
persist: true,
ipamV4Config: []*IpamConf{
@ -142,7 +141,7 @@ func TestNetworkMarshalling(t *testing.T) {
}
if n.name != nn.name || n.id != nn.id || n.networkType != nn.networkType || n.ipamType != nn.ipamType ||
n.addrSpace != nn.addrSpace || n.endpointCnt != nn.endpointCnt || n.enableIPv6 != nn.enableIPv6 ||
n.addrSpace != nn.addrSpace || n.enableIPv6 != nn.enableIPv6 ||
n.persist != nn.persist || !compareIpamConfList(n.ipamV4Config, nn.ipamV4Config) ||
!compareIpamInfoList(n.ipamV4Info, nn.ipamV4Info) || !compareIpamConfList(n.ipamV6Config, nn.ipamV6Config) ||
!compareIpamInfoList(n.ipamV6Info, nn.ipamV6Info) {

71
libnetwork/network.go
View File

@ -152,7 +152,7 @@ type network struct {
ipamV4Info []*IpamInfo
ipamV6Info []*IpamInfo
enableIPv6 bool
endpointCnt uint64
epCnt *endpointCnt
generic options.Generic
dbIndex uint64
svcRecords svcMap
@ -296,7 +296,6 @@ func (n *network) CopyTo(o datastore.KVObject) error {
dstN.id = n.id
dstN.networkType = n.networkType
dstN.ipamType = n.ipamType
dstN.endpointCnt = n.endpointCnt
dstN.enableIPv6 = n.enableIPv6
dstN.persist = n.persist
dstN.dbIndex = n.dbIndex
@ -339,48 +338,11 @@ func (n *network) DataScope() string {
return n.driverScope()
}
func (n *network) EndpointCnt() uint64 {
func (n *network) getEpCnt() *endpointCnt {
n.Lock()
defer n.Unlock()
return n.endpointCnt
}
func (n *network) atomicIncDecEpCnt(inc bool) error {
retry:
n.Lock()
if inc {
n.endpointCnt++
} else {
n.endpointCnt--
}
n.Unlock()
store := n.getController().getStore(n.DataScope())
if store == nil {
return fmt.Errorf("store not found for scope %s", n.DataScope())
}
if err := n.getController().updateToStore(n); err != nil {
if err == datastore.ErrKeyModified {
if err := store.GetObject(datastore.Key(n.Key()...), n); err != nil {
return fmt.Errorf("could not update the kvobject to latest when trying to atomic add endpoint count: %v", err)
}
goto retry
}
return err
}
return nil
}
func (n *network) IncEndpointCnt() error {
return n.atomicIncDecEpCnt(true)
}
func (n *network) DecEndpointCnt() error {
return n.atomicIncDecEpCnt(false)
return n.epCnt
}
// TODO : Can be made much more generic with the help of reflection (but has some golang limitations)
@ -391,7 +353,6 @@ func (n *network) MarshalJSON() ([]byte, error) {
netMap["networkType"] = n.networkType
netMap["ipamType"] = n.ipamType
netMap["addrSpace"] = n.addrSpace
netMap["endpointCnt"] = n.endpointCnt
netMap["enableIPv6"] = n.enableIPv6
if n.generic != nil {
netMap["generic"] = n.generic
@ -437,7 +398,6 @@ func (n *network) UnmarshalJSON(b []byte) (err error) {
n.name = netMap["name"].(string)
n.id = netMap["id"].(string)
n.networkType = netMap["networkType"].(string)
n.endpointCnt = uint64(netMap["endpointCnt"].(float64))
n.enableIPv6 = netMap["enableIPv6"].(bool)
if v, ok := netMap["generic"]; ok {
@ -604,7 +564,7 @@ func (n *network) Delete() error {
return &UnknownNetworkError{name: name, id: id}
}
numEps := n.EndpointCnt()
numEps := n.getEpCnt().EndpointCnt()
if numEps != 0 {
return &ActiveEndpointsError{name: n.name, id: n.id}
}
@ -622,23 +582,14 @@ func (n *network) Delete() error {
}()
// deleteFromStore performs an atomic delete operation and the
// network.endpointCnt field will help prevent any possible
// network.epCnt will help prevent any possible
// race between endpoint join and network delete
if err = n.getController().deleteFromStore(n); err != nil {
if err == datastore.ErrKeyModified {
return types.InternalErrorf("operation in progress. delete failed for network %s. Please try again.")
}
return err
if err = n.getController().deleteFromStore(n.getEpCnt()); err != nil {
return fmt.Errorf("error deleting network endpoint count from store: %v", err)
}
if err = n.getController().deleteFromStore(n); err != nil {
return fmt.Errorf("error deleting network from store: %v", err)
}
defer func() {
if err != nil {
n.dbExists = false
if e := n.getController().updateToStore(n); e != nil {
log.Warnf("failed to recreate network in store %s : %v", n.name, e)
}
}
}()
n.ipamRelease()
@ -736,7 +687,7 @@ func (n *network) CreateEndpoint(name string, options ...EndpointOption) (Endpoi
}()
// Increment endpoint count to indicate completion of endpoint addition
if err = n.IncEndpointCnt(); err != nil {
if err = n.getEpCnt().IncEndpointCnt(); err != nil {
return nil, err
}

25
libnetwork/store.go
View File

@ -69,6 +69,13 @@ func (c *controller) getNetworkFromStore(nid string) (*network, error) {
continue
}
ec := &endpointCnt{n: n}
err = store.GetObject(datastore.Key(ec.Key()...), ec)
if err != nil {
return nil, fmt.Errorf("could not find endpoint count for network %s: %v", n.Name(), err)
}
n.epCnt = ec
return n, nil
}
@ -94,6 +101,14 @@ func (c *controller) getNetworksFromStore() ([]*network, error) {
for _, kvo := range kvol {
n := kvo.(*network)
n.ctrlr = c
ec := &endpointCnt{n: n}
err = store.GetObject(datastore.Key(ec.Key()...), ec)
if err != nil {
return nil, fmt.Errorf("could not find endpoint count key %s for network %s while listing: %v", datastore.Key(ec.Key()...), n.Name(), err)
}
n.epCnt = ec
nl = append(nl, n)
}
}
@ -211,15 +226,15 @@ func (c *controller) unWatchSvcRecord(ep *endpoint) {
c.unWatchCh <- ep
}
func (c *controller) networkWatchLoop(nw *netWatch, ep *endpoint, nCh <-chan datastore.KVObject) {
func (c *controller) networkWatchLoop(nw *netWatch, ep *endpoint, ecCh <-chan datastore.KVObject) {
for {
select {
case <-nw.stopCh:
return
case o := <-nCh:
n := o.(*network)
case o := <-ecCh:
ec := o.(*endpointCnt)
epl, err := n.getEndpointsFromStore()
epl, err := ec.n.getEndpointsFromStore()
if err != nil {
break
}
@ -300,7 +315,7 @@ func (c *controller) processEndpointCreate(nmap map[string]*netWatch, ep *endpoi
return
}
ch, err := store.Watch(ep.getNetwork(), nw.stopCh)
ch, err := store.Watch(ep.getNetwork().getEpCnt(), nw.stopCh)
if err != nil {
log.Warnf("Error creating watch for network: %v", err)
return