08:16:12 GMT <dhanush> is there a way to fetch n elements from a redis set?
08:16:28 GMT <dhanush> I dont want to use `smembers` as the set in question is huge.
08:25:38 GMT <minus> dhanush: http://redis.io/commands/#set SRANDMEMBER probably
08:26:40 GMT <dhanush> minus: aha!
08:26:45 GMT <dhanush> I missed it somehow.
12:38:53 GMT <crazyadm> how to optimize redis performance
12:43:55 GMT <minus> buy faster hardware
12:44:22 GMT <minus> or try this http://redis.io/topics/memory-optimization
13:03:11 GMT <xiaomiao> optimize which part?
13:20:50 GMT <cpama> hi all.  my master slave replication is broken this morning and i can't figure out why.  i've restarted redis on both the master and slave... but anytime I run INFO REPLICATION on the slave it shows the link as "down"
13:21:19 GMT <cpama> I've tried to run netstat -lnp on both the slave and master... and I do see references to the port 6379
13:21:46 GMT <cpama> specifically, if the master's ip address is 10.1.2.3 then I see this in the netstat -lnp output:
13:22:14 GMT <cpama> tcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      21399/redis-server
13:22:14 GMT <cpama> tcp        0      0 10.1.2.3:6379      0.0.0.0:*               LISTEN      21399/redis-server
13:22:24 GMT <cpama> and on the slave i see:
13:22:42 GMT <cpama> tcp        0      0 0.0.0.0:6379            0.0.0.0:*               LISTEN      5577/redis-server
13:22:42 GMT <cpama> tcp        0      0 :::22                   :::*                    LISTEN      1857/sshd
13:22:42 GMT <cpama> tcp        0      0 :::6379                 :::*                    LISTEN      5577/redis-server
13:23:29 GMT <cpama> I've also retried running the command "slaveof 10.1.2.3 6379" in the cli on the slave...
13:23:46 GMT <cpama> and i get this message: 127.0.0.1:6379> slaveof 10.1.2.3 6379
13:23:46 GMT <cpama> OK Already connected to specified master
13:23:46 GMT <cpama> 127.0.0.1:6379>
13:23:55 GMT <cpama> not sure what else I should check
14:09:35 GMT <kablamo> @cpama logfiles? and try to telnet to master/slave ip/port?  also you need 'dir' and 'dbfilename' set in redis conf.  also are you binding to the right ips.  .. thats all i can think of
14:10:04 GMT <cpama> kablamo, i just rebooted the slave... and it came back.
14:10:05 GMT <cpama> :(
14:10:08 GMT <cpama> worries me
14:10:45 GMT <cpama> i will check the settings you mention in redis.conf right now on the master....
14:15:38 GMT <cpama> kablamo, this is what I have the redis.conf file on the master:
14:15:39 GMT <cpama> # The filename where to dump the DB
14:15:39 GMT <cpama> dbfilename dump.rdb
14:15:46 GMT <cpama> looks like just the default value right?
14:16:01 GMT <cpama> and then in the folder /var/lib/redis i have a dump.rdb file
14:16:23 GMT <cpama> is it ok to leave as is kablamo?
14:20:14 GMT <cpama> i think i know how I broke the replication kablamo
14:20:28 GMT <cpama> I tried to add a requirepass value on the master.
14:20:34 GMT <cpama> restarted redis on master
14:20:49 GMT <cpama> and then on slave... i added the same password value in the "masterauth" field in the config file
14:20:55 GMT <cpama> and then restarted slave.
14:21:17 GMT <cpama> then when I run redis-cli on the slave and check INFO REPLICATION it shows that the master link is down
14:21:50 GMT <cpama> earlier in the day, I undid the password set up... and thought replication would just start working again... but I think this must be what broke it in the first place.
15:22:17 GMT <ryanleary> anyone have suggestions/best practice for renaming a key in redis-cluster across slots?
17:19:55 GMT <dgaff> Hey all - whats the easiest way to do a disk backup of the redis database?
17:20:03 GMT <dgaff> can I just copy dump.rdb to some other spot?
17:21:39 GMT <minus> that's a possibility
17:23:48 GMT <dgaff> minus: guaranteed to work?
17:24:05 GMT <minus> it's always complete, yes
17:24:20 GMT <dgaff> I have a few days worth of setting up a nice database, and I want to be able to powercycle the box but be able to load that up again in a week, for example
17:24:25 GMT <minus> you could do a manual save/bgsave too i guess
17:24:44 GMT <dgaff> I don't need to do the backup as it stands, right?
17:24:56 GMT <minus> well, if you don't remove the .rdb you don't have to back it up anywhere
17:24:58 GMT <dgaff> Like, you can powercycle a box and bring redis back up and data is still there?
17:25:00 GMT <dgaff> yeah
17:25:02 GMT <dgaff> ok
17:25:08 GMT <dgaff> I'm going to make one just in case
17:26:10 GMT <dgaff> also thanks for your help the last few days of questions - wrapping up the project now, redis is wonderful
17:36:19 GMT <hell_razer> hello there! I am trying to mix in lau script KEYS * command and DEL command, redis.call('DEL', *redis.call('KEYS', KEYS[1])) - I can not find any information how to converts result from KEYS to list of keys for delete command.
17:36:44 GMT <hell_razer> asterisk - is how it can be for example in Python
18:02:31 GMT <Zerith> Hello. I'm seeing a really weird bug that I can't explain. I have a redis list to which I LPUSH entries. the thing is, I see entries disappearing off this list all the time (And I'm not crazy, I have redis MONITOR open before my eyes and the log can't explain this)
18:03:19 GMT <Zerith> E.g. list X had 4 entries, a minute has passed, and some client pops off that list what should've been the second entry - then I look at the list and there are only 2 entries
18:03:38 GMT <Zerith> and there's nothing in the log thatcan  explain this
18:04:18 GMT <kulelu88> where does the backed up database reside? minus
18:06:13 GMT <Zerith> you mean the rdb file?
18:06:52 GMT <minus> /var/lib/redis usually
18:07:34 GMT <kulelu88> I thought everytime I shut-down my LXC container that the Redis-DB was being removed/deleted. then I found out that the data persists in it
20:36:45 GMT <emr> Hello, i have 3 set, lets call a,b and c i want to get bUc\a (in other words (b+c)-a) is it possible?
20:42:40 GMT <emr> hm i found it sunionstore tmp b c, sdiff tmp a, thanks anyway