presto-main/src/main/java/io/prestosql/operator/ExchangeClient.java/ExchangeClient/throwIfFailed
class ExchangeClient:    private void throwIfFailed()
    {
        Throwable t = failure.get();
        if (t != null) {
            throwIfUnchecked(t);
            throw new RuntimeException(t);
        }
    }