// close sends resolve intent commands for all key ranges this
// transaction has covered, clears the keys cache and closes the
// metadata heartbeat. Any keys listed in the resolved slice have
// already been resolved and do not receive resolve intent commands.
func (tm *txnMetadata) close(trace *tracer.Trace, txn *proto.Transaction, resolved []proto.Key, sender client.Sender, stopper *stop.Stopper) {
close(tm.txnEnd) // stop heartbeat
trace.Event("coordinator stops")
if tm.keys.Len() > 0 {
if log.V(2) {
log.Infof("cleaning up %d intent(s) for transaction %s", tm.keys.Len(), txn)
}
}
// TODO(tschottdorf): Should create a Batch here.
for _, o := range tm.keys.GetOverlaps(proto.KeyMin, proto.KeyMax) {
// If the op was range based, end key != start key: resolve a range.
var call proto.Call
key := o.Key.Start().(proto.Key)
endKey := o.Key.End().(proto.Key)
if !key.Next().Equal(endKey) {
call.Args = &proto.InternalResolveIntentRangeRequest{
RequestHeader: proto.RequestHeader{
Timestamp: txn.Timestamp,
Key: key,
EndKey: endKey,
User: security.RootUser,
Txn: txn,
},
}
call.Reply = &proto.InternalResolveIntentRangeResponse{}
} else {
// Check if the key has already been resolved; skip if yes.
found := false
for _, k := range resolved {
if key.Equal(k) {
found = true
}
}
if found {
continue
}
call.Args = &proto.InternalResolveIntentRequest{
RequestHeader: proto.RequestHeader{
Timestamp: txn.Timestamp,
Key: key,
User: security.RootUser,
Txn: txn,
},
}
call.Reply = &proto.InternalResolveIntentResponse{}
}
// We don't care about the reply channel; these are best
// effort. We simply fire and forget, each in its own goroutine.
ctx := tracer.ToCtx(context.Background(), trace.Fork())
stopper.RunAsyncTask(func() {
if log.V(2) {
log.Infof("cleaning up intent %q for txn %s", call.Args.Header().Key, txn)
}
sender.Send(ctx, call)
if call.Reply.Header().Error != nil {
log.Warningf("failed to cleanup %q intent: %s", call.Args.Header().Key, call.Reply.Header().GoError())
}
})
}
tm.keys.Clear()
}
// resolve sends resolve intent commands for all key ranges this transaction
// has covered. Any keys listed in the resolved slice have already been
// resolved and are skipped.
func (tm *txnMetadata) resolve(trace *tracer.Trace, resolved []proto.Key, sender client.Sender) {
txn := &tm.txn
if tm.keys.Len() > 0 {
if log.V(2) {
log.Infof("cleaning up %d intent(s) for transaction %s", tm.keys.Len(), txn)
}
}
// TODO(tschottdorf): Should create a Batch here. However, we're resolving
// intents and if those are on meta records, there may be a certain order
// in which they need to be resolved so that they can get routed to the
// correct range. Since a batch runs its commands one by one and we don't
// know the correct order, we prefer to fire them off in parallel.
var wg sync.WaitGroup
for _, o := range tm.keys.GetOverlaps(proto.KeyMin, proto.KeyMax) {
// If the op was range based, end key != start key: resolve a range.
var call proto.Call
key := o.Key.Start().(proto.Key)
endKey := o.Key.End().(proto.Key)
if !key.Next().Equal(endKey) {
call.Args = &proto.InternalResolveIntentRangeRequest{
RequestHeader: proto.RequestHeader{
Timestamp: txn.Timestamp,
Key: key,
EndKey: endKey,
User: security.RootUser,
Txn: txn,
},
}
call.Reply = &proto.InternalResolveIntentRangeResponse{}
} else {
// Check if the key has already been resolved; skip if yes.
found := false
for _, k := range resolved {
if key.Equal(k) {
if log.V(2) {
log.Warningf("skipping previously resolved intent at %q", k)
}
found = true
}
}
if found {
continue
}
call.Args = &proto.InternalResolveIntentRequest{
RequestHeader: proto.RequestHeader{
Timestamp: txn.Timestamp,
Key: key,
User: security.RootUser,
Txn: txn,
},
}
call.Reply = &proto.InternalResolveIntentResponse{}
}
ctx := tracer.ToCtx(context.Background(), trace.Fork())
if log.V(2) {
log.Infof("cleaning up intent %q for txn %s", call.Args.Header().Key, txn)
}
// Each operation gets their own goroutine. We only want to return to
// the caller after the operations have finished.
wg.Add(1)
go func() {
sender.Send(ctx, call)
wg.Done()
if call.Reply.Header().Error != nil {
log.Warningf("failed to cleanup %q intent: %s", call.Args.Header().Key, call.Reply.Header().GoError())
}
}()
}
defer trace.Epoch("waiting for intent resolution")()
wg.Wait()
tm.keys.Clear()
}