How to use Redis on production

[Abhishek Tiwari]

How should we use redis on production 

a) cluster mode 

b) Master -slave 

We are using phpredis  client .

[Itamar Haber]

Please expand.

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[Abhishek Tiwari]

hi Itamar,

I am using phpredis client  and tested the feature . This working fine on local machine .

Now i have to go live with this feature  ,  we are high traffic website so we need multiple redis instances .

in that case should i use  RedisArray to create object or Rediscluster

In case of RedisArray when we any of the node goes down it gives me  

( ! ) Fatal error: Uncaught exception 'RedisException' with message 'Connection closed'

[Itamar Haber]

Redis Cluster is a tool to for tackling scaling challenges. Master-Slave is for high availability and/or read scaling. From your description it appears that you want high availability to prevent the denial of service in the event of node failure. There are several ways to do that with Redis, the most common is using Sentinel to manager your replication sets (pods). Depending on your definition of "high traffic", you may need to cluster as well.

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[Abhishek Tiwari]

Thanks for reply . Need more clarity 

Hi 

We have setup a cluster say host1, host2, host3 ,host4 for production and using phpredis client .

my questions is following 

a)  should i put host1,host2,host3,host4 behind load balancer on production ?  

and connect like below

$redisObj = new Redis(); 

 $redisObj->pconnect('load balencer IP', 'Port', 2);

OR

b)  we have to connect like this 

$obj_cluster = new RedisCluster(NULL, Array('host1:6379', 'host2:6379','host3:6379','host4:6379'));

    $obj_cluster->ping();

 

On Thursday, August 20, 2015 at 12:57:52 PM UTC+5:30, Abhishek Tiwari wrote:

[Itamar Haber]

I'm not a phpredis guru, but if you've set up a Redis v3 cluster on these nodes, it looks like b) is the way to go (according to https://github.com/phpredis/phpredis/blob/develop/cluster.markdown).

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[Abhishek Tiwari]

Thanks ,

I have to run Keys command over cluster (twemproxy) . Is it possible to do it .

My use case is to delete all the keys that are matching 

a) Product_*

b) Blocks_*

How can i do it over cluster environment ? 

Or if this is not possible to do to then is there any way to delete pattern matched keys.

Regards,

Abhishek

[Matt Silverlock]

Look at using SCAN ... MATCH %pattern% as per http://redis.io/commands/scan - and iterate over the cursor until it hits 0. Avoid using KEYS * in production as it's a significant performance hit.

Also consider the way your data is structured—do you need to manually delete things? Can expiring (via EXPIRES or SETEX) help you? What about your data structures (hashes, sorted sets) - can you simply run a MULTI over a series of hashes where you already know the keys and avoid having to pattern match? Not all solutions may fit but worth thinking about.

[Josiah Carlson]

You will have to directly access your Redis servers, not through Twemproxy.

 - Josiah