// instantiate all aggregators and register them at the iteration global registry
aggregatorRegistry = new RuntimeAggregatorRegistry(config.getIterationAggregators
(getUserCodeClassLoader()));
IterationAggregatorBroker.instance().handIn(brokerKey, aggregatorRegistry);
DataInputView superstepResult = null;
while (this.running && !terminationRequested()) {
if (log.isInfoEnabled()) {
log.info(formatLogString("starting iteration [" + currentIteration() + "]"));