void deductCount(final long value1, final long value2) {
        long[] current;
        final long[] update = new long[NUM_VALUES];
        do {
            current = values.get();
            update[0] = current[0] - value1;
            update[1] = current[1] - value2;
        } while (!values.compareAndSet(current, update));
    }
Should only be used by log writer to deduct written counts. This method
does not affect stat rules.
metamorphosis-commons/src/main/java/com/taobao/metamorphosis/utils/monitor/ValueObject.java