如何保证redis中都是热点数据

# In short... if you have slaves attached it is suggested that you set a lower

# limit for maxmemory so that there is some free RAM on the system for slave

# output buffers (but this is not needed if the policy is 'noeviction').

#

# maxmemory <bytes>

maxmemory 268435456

maxmemory-policy volatile-lru