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java.util.concurrent.BrokenBarrierException: null	at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:200)	at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:355)	at com.datastax.bdp.concurrent.FlushTask.bulkSync(FlushTask.java:76)	at com.datastax.bdp.concurrent.Worker.run(Worker.java:94)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)