@Override
                    public Object run() {
                        try {
                            Field f = Unsafe.class.getDeclaredField("theUnsafe");
                            f.setAccessible(true);
                            return f.get(null);
                        } catch (NoSuchFieldException e) {
                            // It doesn't matter what we throw;
                            // it's swallowed in getBestComparer().
                            throw new Error();
                        } catch (IllegalAccessException e) {
                            throw new Error();
                        }
                    }
The offset to the first element in a byte array.
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/common/utils/Bytes.java