|
public Reduce ( |
||
| q | ||
| reduce_arg | object | |
| current_result | object | |
| child_rpc | ||
| Результат | void | |
/**
* @return true if we successfully started the next reduce
*/
protected bool TryNextReduce(State new_s, State old_s, RpcResult v, bool cont)
{
if (new_s.Done)
{
SendResult(new_s.ReduceResult);
return(false);
}
bool start_red = new_s.Reducing && (cont || (false == old_s.Reducing));
if (LogEnabled)
{
ProtocolLog.Write(ProtocolLog.MapReduce,
String.Format("MapReduce: {0}, TryNextReduce: {1}.",
_node.Address, start_red));
}
if (start_red)
{
Channel r_chan = new Channel(1, v);
r_chan.CloseEvent += this.ReduceHandler;
object startval = new_s.ReduceResult == State.DEFAULT_OBJ ? null : new_s.ReduceResult;
if (LogEnabled)
{
ProtocolLog.Write(ProtocolLog.MapReduce,
String.Format("MapReduce: {0} abt to Reduce({1},{2},{3})",
_node.Address, _mr_args.ReduceArg, startval, v));
}
try {
_mr_task.Reduce(r_chan, _mr_args.ReduceArg, startval, v);
}
catch (Exception x) {
//Reduce is where we do error handling, if that doesn't work, oh well:
if (LogEnabled)
{
ProtocolLog.Write(ProtocolLog.MapReduce,
String.Format("MapReduce: {0}, reduce threw: {1}.", _node.Address, x));
}
SendResult(x);
return(false);
}
}
return(start_red);
}
