console.md

Start master in another window with redis-server master.conf

Fill master server with 10% keys that will expire very soon and 90% keys that wont expire for a while:

% ruby fill.rb | redis-cli --pipe -p 9998
All data transferred. Waiting for the last reply...
Last reply received from server.
errors: 0, replies: 1000002

Wait a few seconds and then start slave in another window with redis-server slave.conf

Verify that the slave expunged all low-TTL keys prematurely:

% redis-cli -p 9998 info | grep db0
db0:keys=999800,expires=999800,avg_ttl=19697029
% redis-cli -p 9999 info | grep db0
db0:keys=900001,expires=900001,avg_ttl=0

fill.rb

def send(*cmd)
  proto = []
  proto << "*#{cmd.length}\r\n"
  cmd.each do |arg|
    proto << "$#{arg.to_s.bytesize}\r\n"
    proto << "#{arg}\r\n"
  end
  STDOUT.write( proto.join( "" ) )
end

send( "FLUSHALL" )

(0...10_000).each do |n|
  send( "SETEX", n, 5, "x" )
end

(10_000..1_000_000).each do |n|
  send( "SETEX", n, 21600, "x" )
end

master.conf

port 9998
dbfilename master.rdb
dir ./

slave.conf

port 9999
dbfilename slave.rdb
dir ./
slaveof localhost 9998