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Redis 2.8.7 is out

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Re: Redis 2.8.7 is out

#3

Post by antirez »

Oh, I didn't expected to see a patch release posted here. As I wrote in the announce this patch release is a bit special as it adds a few new features so at least there is something to explore. Btw ask me anything about this release if something is not clear, I'll try to reply at my best.

Re: Redis 2.8.7 is out

#4

Post by ksec »

antirez wrote: post #3

Oh, I didn't expected to see a patch release posted here. As I wrote in the announce this patch release is a bit special as it adds a few new features so at least there is something to explore. Btw ask me anything about this release if something is not clear, I'll try to reply at my best.

Just want to say, Thank You for Redis.

Re: Redis 2.8.7 is out

#5

Post by antirez »

ksec wrote: post #4
antirez wrote: post #3

Oh, I didn't expected to see a patch release posted here. As I wrote in the announce this patch release is a bit special as it adds a few new features so at least there is something to explore. Btw ask me anything about this release if something is not clear, I'll try to reply at my best.

Just want to say, Thank You for Redis.

Thank you ksec, without a great community there is no fun.

Re: Redis 2.8.7 is out

#6

Post by leobelle »

antirez wrote: post #3

Oh, I didn't expected to see a patch release posted here. As I wrote in the announce this patch release is a bit special as it adds a few new features so at least there is something to explore. Btw ask me anything about this release if something is not clear, I'll try to reply at my best.

Thanks for answering questions, any comments or progress on aphyr's complaints about using proven algorithms for Redis replication? [1]

[1] http://aphyr.com/posts/307-call-me-maybe-redis-redux

Re: Redis 2.8.7 is out

#8

Post by antirez »

leobelle wrote: post #6
antirez wrote: post #3

Oh, I didn't expected to see a patch release posted here. As I wrote in the announce this patch release is a bit special as it adds a few new features so at least there is something to explore. Btw ask me anything about this release if something is not clear, I'll try to reply at my best.

Thanks for answering questions, any comments or progress on aphyr's complaints about using proven algorithms for Redis replication? [1] [1] http://aphyr.com/posts/307-call-me-maybe-redis-redux

Given that Apyhr's investigation in the blog post you cite does not involve anything implemented or planned for Redis, I'm not able to reply to the question. Maybe you fell in the mediatic trap of considering that discussion about Redis turning into a CP system using the proposed algorithm. If you re-read the post, Aphyr itself explains that this is not Redis Cluster.

If you are curious about what triggered the post, is my claim that WAIT per se as a primitive does not mean CP or any other kind of consistency, but that it is defined by the rest of the system. To prove my point, I orchestrated a toy and god-driven distributed system where WAIT turned into a strong consistent primitive. The point is that you can replace the "God" part with other stuff to get it real-world.

Apyhr modeled it and found that if you don't read the same way you write (via agreement) the system is inconsistent when you consider reads, but I think this was common knowledge. Every CP system in the base case needs to follow the same path for writes and reads. However most of the times you can invent optimizations to speedup reads.

p.s. Redis replication is asynchronous by default. The WAIT primitive in Redis unstable does just what it claims, that is, to return an acknowledgment when the specified number of replicas received some data. The practical effect is that you can make writes safer for a (big) latency cost.

Re: Redis 2.8.7 is out

#9

Post by antirez »

munimkazia wrote: post #7

I've been following redis sentinel development for a while now, and I can't wait for it to go stable. Has anyone here tried it out?

Hey, at this point I think Sentinel is considered Stable by the Redis community. It is relatively new code, but the second incarnation uses better algorithms and was applied in a number of production environments.

What we recommend currently is just to test it in your specific environment, and to understand the way it works. The weak thing currently, to be honest, is the documentation, but I'm working at it.

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