protected void waitForOpenSlot(int maxProcessesOnNode, Reporter reporter)
throws IOException, InterruptedException {
while (true) {
// sleep for a random length of time between 0 and 60 seconds
long sleepTime = (long) (Math.random() * 1000 * 60);
logger.info("sleeping for " + sleepTime);
Thread.sleep(sleepTime);
int numRunningMappers = getNumRunningMappers();
logger.info("num running mappers: " + numRunningMappers);
if (numRunningMappers < maxProcessesOnNode) return;
reporter.progress();
}
}
