presto-main/src/main/java/io/prestosql/operator/exchange/LocalExchangeMemoryManager.java/LocalExchangeMemoryManager/LocalExchangeMemoryManager
class LocalExchangeMemoryManager:    public LocalExchangeMemoryManager(long maxBufferedBytes)
    {
        checkArgument(maxBufferedBytes > 0, "maxBufferedBytes must be > 0");
        this.maxBufferedBytes = maxBufferedBytes;
    }