Re: how to achieve URL hash LB algorithm on ZXTM

Thanks Ben.

so there is no way for me always to balance same URLs into same squid
server. I am thinking to get it done by Java extension(coz I can use
getNodes in Java) . The input of java extension is URL, output is the
$nodename which I should send traffic into.






On Tue, Aug 11, 2009 at 4:11 PM, Ben Mansell <[email protected]> wrote:

> It is 'by design' that the TrafficScript rule hashes the URLs into ~65000
> different 'buckets', but that you should configure ZXTM to remember fewer
> mappings than this.
>
> ZXTM will store the mappings whatever their value, but will only remember
> the most recently used mappings. In this way, over time the maps of old URL
> -> squid server will slowly be forgotten, and a new server will be picked
> when that URL is seen again.
>
> This will let ZXTM load balance the workload and ensures that any spikes of
> workload across the cluster will be smoothed out over time.
>
>
> Ben
>
>
> On 07/08/2009 12:18, Eric Y. Zhang wrote:
>
>> Hi Ben
>>
>> $session = string.left( string.hashMD5(
>> http.getHostHeader().http.getRawURL() ), 2 ); is always bigger than
>> universal_cache_size; so when one new URL not in universal cache comes in,
>> ZXTM will balance it using the algorithm I set in the pool?
>>
>> because I don't have enough memory to store all persistence keys into, so
>> that would be a  problem.
>>
>>
>> another interesting question is do you implement the URL hash on your
>> appliance device?
>>
>>
>> I checked iRule from Devcentral of F5 and tried to convert that election
>> Hash into traffic script, but it seems there is no function in traffic
>> script to list active nodes of a pool.
>>
>> thanks
>>
>> Eric
>>
>>
>> On Fri, Aug 7, 2009 at 10:02 AM, Eric Y. Zhang<[email protected]
>> <mailto:[email protected]>>  wrote:
>> thanks to all of you who discuss this. I learned to many from your
>> threads. this is the most helpful mailing list I ever been.
>>
>> I will try to figure out the best way to spread load/maintain the
>> availability.
>>
>> thanks again
>>
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