Multithreading best practices : constraining tasks newFixedThreadPool

Question

I want to launch a lot of tasks to run on a database of +-42Mio records. I want to run this in batches of 5000 records/time (results in 850 tasks). I also want to limit the

Answer 1

The best way would be to use countdownlatch as follows

    ExecutorService executorService = Executors.newFixedThreadPool(16);
  CountdownLatch latch = new CountdownLatch(900);
 FetcherRunner runner = new FetcherRunner(routes, start, stop, latch);
 latch.await();

in the FetcherRunner under finally block use latch.countDown(); code after await() will be executed only when all the tasks are completed.