/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
protected override void Reduce(Text key, IEnumerable <IntWritable> values, Reducer.Context
context)
{
// Make one reducer slower for speculative execution
TaskAttemptID taid = context.GetTaskAttemptID();
long sleepTime = 100;
Configuration conf = context.GetConfiguration();
bool test_speculate_reduce = conf.GetBoolean(MRJobConfig.ReduceSpeculative, false
);
// IF TESTING REDUCE SPECULATIVE EXECUTION:
// Make the "*_r_000000_0" attempt take much longer than the others.
// When speculative execution is enabled, this should cause the attempt
// to be killed and restarted. At that point, the attempt ID will be
// "*_r_000000_1", so sleepTime will still remain 100ms.
if ((taid.GetTaskType() == TaskType.Reduce) && test_speculate_reduce && (taid.GetTaskID
().GetId() == 0) && (taid.GetId() == 0))
{
sleepTime = 10000;
}
try
{
Sharpen.Thread.Sleep(sleepTime);
}
catch (Exception)
{
}
// Ignore
context.Write(key, new IntWritable(0));
}