JvmMetrics.init("TaskTracker", sessionId);
// Create a record for Task Tracker metrics
MetricsContext context = MetricsUtil.getContext("mapred");
metricsRecord = MetricsUtil.createRecord(context, "tasktracker");
metricsRecord.setTag("sessionId", sessionId);
context.registerUpdater(this);
}
synchronized void completeTask() {
++numCompletedTasks;
}