/** Initialization common to Map and Reduce */
void init(JobID jobId) {
this.startTime = JobTracker.getClock().getTime();
this.id = new TaskID(jobId, isMapTask(), partition);
this.skipping = startSkipping();
long speculativeDuration;
if (isMapTask()) {
this.speculativeLag = conf.getMapSpeculativeLag();
speculativeDuration = conf.getMapSpeculativeDuration();
} else {
this.speculativeLag = conf.getReduceSpeculativeLag();
speculativeDuration = conf.getReduceSpeculativeDuration();
}
// speculate only if 1/(1000 * progress_rate) > speculativeDuration
// ie. :
// speculate only if progress_rate < 1/(1000 * speculativeDuration)
if (speculativeDuration > 0) {
this.maxProgressRateForSpeculation = 1.0 / (1000.0 * speculativeDuration);
} else {
// disable this check for durations <= 0
this.maxProgressRateForSpeculation = -1.0;
}
}
