[infinispan-dev] Infinispan Persistence Manager and JBoss Messaging Journal

[Clebert Suconic]

Yeah... I will take a look.

On 07/30/2009 12:58 PM, Jason T. Greene wrote:
> So in otherwords, the equivalent of a BDB Hash or Recno type would work.
>
> Jason T. Greene wrote:
>> BUT.... :) If you had a random access file (just integer offsets is 
>> all that is needed), combined with this journal, you could create a 
>> simple record based transaction db, and that could definitely be 
>> mapped. The key hash could be used to map to a block that would 
>> contain near entries.
>>
>> Clebert Suconic wrote:
>>> Well .. ok.. it doesn' t fit on that at the moment.
>>>
>>> On 07/30/2009 12:29 PM, Jason T. Greene wrote:
>>>> The cache store is/can be a superset of the data in memory. So, for 
>>>> example, you may have 1G of data, but only 200M of memory. You can 
>>>> configure the memory part of the cache to be an LRU (data is never 
>>>> lost, just evicted from memory).
>>>>
>>>> Even if the disk storage fits in memory, you likely don't want to 
>>>> load it right away if you dont have to (i.e. waiting on 2 gigs of 
>>>> disk to be read in)
>>>>
>>>>
>>>>
>>>> Clebert Suconic wrote:
>>>>> On restarts, you can get the whole data back on the method load.
>>>>>
>>>>> Eviction is probably a delete. so you probably don' t need to read 
>>>>> the Store for eviction.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On 07/30/2009 12:16 PM, Manik Surtani wrote:
>>>>>>
>>>>>> On 30 Jul 2009, at 18:12, Clebert Suconic wrote:
>>>>>>
>>>>>>>
>>>>>>>> Yes - the cache store stores a superset of what is in memory. 
>>>>>>>> Overflow. So it still needs to be accessible in a random 
>>>>>>>> fashion, using a key.
>>>>>>>>
>>>>>>>> See the load() API on the CacheLoader interface.
>>>>>>>
>>>>>>>
>>>>>>> If the data is in memory, why do you need to recover it from the 
>>>>>>> Store?
>>>>>>
>>>>>> Eviction. Restarts. Etc. :)
>>>>>>
>>>>>> -- 
>>>>>> Manik Surtani
>>>>>> manik at jboss.org
>>>>>> Lead, Infinispan
>>>>>> Lead, JBoss Cache
>>>>>> http://www.infinispan.org
>>>>>> http://www.jbosscache.org
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>>
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