Integer overflow in ExternalSorter.getInitialMemoryRequirement()

], TaskAttempt 3 failed, info=[Error: Failure while running task:java.lang.IllegalArgumentException
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:72)
        at org.apache.tez.runtime.common.resources.MemoryDistributor.registerRequest(MemoryDistributor.java:158)
        at org.apache.tez.runtime.common.resources.MemoryDistributor.requestMemory(MemoryDistributor.java:97)
        at org.apache.tez.runtime.api.impl.TezTaskContextImpl.requestInitialMemory(TezTaskContextImpl.java:192)
        at org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput.initialize(OrderedPartitionedKVOutput.java:95)
        at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask$InitializeOutputCallable.call(LogicalIOProcessorRuntimeTask.java:430)
        at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask$InitializeOutputCallable.call(LogicalIOProcessorRuntimeTask.java:409)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

int initialMemRequestMb = 
        conf.getInt(
            TezRuntimeConfiguration.TEZ_RUNTIME_IO_SORT_MB, 
            TezRuntimeConfiguration.TEZ_RUNTIME_IO_SORT_MB_DEFAULT);
long reqBytes = initialMemRequestMb << 20;