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Posted to users@directory.apache.org by Emmanuel Lécharny <el...@gmail.com> on 2012/06/08 08:55:13 UTC
Re: [ApacheDS] Question regarding caching behavior
Le 6/8/12 6:42 AM, Garbage a écrit :
> From what I know ApacheDS supports caching of search results, that means when I issue the same search after e.g. one minute the result will be returned from the cache.
> First question: is this correct ?
No, searches are computed every time you send a request.
>
> Is this something ApacheDS does on it's own or is this the job of the partitions involved ?
> Second question: when implementing a custom partition would I need to take care of caching on my own ?
Atm, yes. We could have implemented a cache on top of partition, but
it's not yet the case (such a cache will keep the entries assuming they
have not been updated since their presence in the cache). This is
certainly something we want to have alter, but atm we are working on
stablizing the server itself...
--
Regards,
Cordialement,
Emmanuel Lécharny
www.iktek.com
Re: [ApacheDS] Question regarding caching behavior [solved]
Posted by Emmanuel Lécharny <el...@gmail.com>.
Le 6/8/12 1:37 PM, Garbage a écrit :
> Am 08.06.2012 um 08:55 schrieb Emmanuel Lécharny<el...@gmail.com>:
>
>> Le 6/8/12 6:42 AM, Garbage a écrit :
>>> From what I know ApacheDS supports caching of search results, that means when I issue the same search after e.g. one minute the result will be returned from the cache.
>>> First question: is this correct ?
>> No, searches are computed every time you send a request.
>>> Is this something ApacheDS does on it's own or is this the job of the partitions involved ?
>>> Second question: when implementing a custom partition would I need to take care of caching on my own ?
>> Atm, yes. We could have implemented a cache on top of partition, but it's not yet the case (such a cache will keep the entries assuming they have not been updated since their presence in the cache). This is certainly something we want to have alter, but atm we are working on stablizing the server itself...
>>
>>
>> --
>> Regards,
>> Cordialement,
>> Emmanuel Lécharny
>> www.iktek.com
>>
> Thanks, so I know that it makes sense to implement caching in the partition. Just wanted to make sure that I don't create (at least for now) unnecessary code.
This is not as simple.
There are a few things you might want to cache on a LDAP server, but
definitively caching entries is a major saver. Now, that raises a few
concerns :
- how many entries will you cache ? (an entry can be quite large, for
instance for those entries having a JpegPhot AttributeType)
- how do you ensure the cache concurrency ? You may have many threads
accessing to this cache, and it requires careful protection against
concurrent modifications
- At some point, caching an entry might be overkilling : as you will any
way modify the returned entry, as you'll remove some of the Attrbutes or
values, you will copy this cached entry anyway (there are other options,
like not copying the entry, but generate the final result on the fly,
having gathered the requested Attributes to return, but this can be very
tricky to implement.
In any case, just try first to get your partiton working before
implementing some cache :)
--
Regards,
Cordialement,
Emmanuel Lécharny
www.iktek.com
Re: [ApacheDS] Question regarding caching behavior [solved]
Posted by Garbage <ga...@gmx.de>.
Am 08.06.2012 um 08:55 schrieb Emmanuel Lécharny <el...@gmail.com>:
> Le 6/8/12 6:42 AM, Garbage a écrit :
>> From what I know ApacheDS supports caching of search results, that means when I issue the same search after e.g. one minute the result will be returned from the cache.
>> First question: is this correct ?
> No, searches are computed every time you send a request.
>>
>> Is this something ApacheDS does on it's own or is this the job of the partitions involved ?
>> Second question: when implementing a custom partition would I need to take care of caching on my own ?
> Atm, yes. We could have implemented a cache on top of partition, but it's not yet the case (such a cache will keep the entries assuming they have not been updated since their presence in the cache). This is certainly something we want to have alter, but atm we are working on stablizing the server itself...
>
>
> --
> Regards,
> Cordialement,
> Emmanuel Lécharny
> www.iktek.com
>
Thanks, so I know that it makes sense to implement caching in the partition. Just wanted to make sure that I don't create (at least for now) unnecessary code.