Re: Prevayler vs Terracotta

Ooops..  AVRO is at 1.2 ... hadoop overall is 0.21.

Won't solve the problem, but should help.

R

On Nov 11, 2009, at 12:26 PM, Ross Rick wrote:

> AVRO from the Apache Hadoop provides a fast compact binary
> serialization with a JSON descriptor up front so that you can resolve
> schema conflicts on the fly.
>
> Not exactly 1.0 but a good idea and clearly going to be well  
> supported.
>
> http://hadoop.apache.org/avro/
>
> R
>
>
> On Nov 11, 2009, at 12:13 PM, Clebert Suconic wrote:
>
>> Serialization sucks!
>>
>>
>> Provide an alternate Marshalling API for users, and you will have a
>> *much* better throughput.
>>
>>
>>
>>
>> On Wed, Nov 11, 2009 at 1:38 PM, William Pietri
>> <[email protected]> wrote:
>>> Ralph Johnson wrote:
>>>
>>> Prevayler does require you to hold all your objects in the JVM heap
>>> in
>>> RAM. If you cannot do that, as you know, you cannot use Prevayler.
>>>
>>>
>>> Do any of you have experience with 64 bit machines?  What is the
>>> biggest Prevayler database you've seen?
>>>
>>>
>>> A client, who does not use Prevayler but is using the hot-in-RAM
>>> approach,
>>> has been using 64-bit machines with large JVMs quite happily. I
>>> think their
>>> production machine had 16 GB of RAM, with talk of expansion.
>>>
>>> The problem with this approach, though, turns out to be read IO
>>> bandwidth
>>> and object deserialization. Their startup times are on the order of
>>> 30
>>> minutes.
>>>
>>> If anybody has interesting solutions (hardware or software) to the
>>> long
>>> startup time problem, I'd love to hear about them, as I think that's
>>> Prevayler's Achilles' Heel for scaling.
>>>
>>> William
>>>
>>>
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>>
>>
>>
>> -- 
>> Clebert Suconic
>> http://www.jboss.org/developers/#ClebertSuconic
>> http://clebertsuconic.blogspot.com
>>
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>
>
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