Re: [Zookeeper-user] zookeeper vs. heartbeat messages

[Ted D. <tdu...@ve...>]

I would definitely recommend zookeeper over heartbeat.  Here are my reasons:

A) it works.  Anything you implement using heartbeats will not work
initially and you will (should) always worry about that implementation
because it won't get as much testing.

B) it works.  The use of ephemeral files is much easier than doing a good
heartbeat API.  In particular, heartbeat always implies some sort of
fail-over which is trivial to implement well in zookeeper and very hard to
implement (correctly) by hand.

C) it works.  Heartbeat architectures often lead logically to a spiraling
number of heartbeats being exchanged.  With zookeeper, your server will be
talking to zookeeper, and everybody else will have low latency updates in
case of a problem (if they want).


Regarding the amount of data, I doubt you will have a problem if you keep
your zookeeper files reasonably sized.  There is an imposed limit of 1MB,
but would you be going anywhere near that?

On 4/22/08 2:31 PM, "Stefan Groschupf" <sg...@10...> wrote:

> Hi
> I'm new to zookeeper and I work on a system that require classical
> master - slave communication similar to hadoop dfs or hbase.
> Though in my case the master need to know much faster if a slave
> crashes than in other cases.
> So I wonder if it would make sense instead of using classical
> heartbeat messages in can use zookeeper.
> Basically the master need to know if a new slave becomes available and
> what kind of data it servers.
> 
> Is there any limitations where the amount of data stored within
> zookeeper becomes an issue?
> Would you recommend to use zookeeper over heartbeat messages?
> 
> Thanks for any hints.
> Stefan
> 
> 
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