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From Jan Kotek <openco...@gmail.com>
Subject Re: JDBM2 released
Date Thu, 23 Dec 2010 23:38:24 GMT
Hi,
> Yeah, at this point, we need something like MVCC implemented in JDBM 3.0

I am afraid I dont have plans for MVCC in JDBM.
Having single transaction greatly reduces complexity and I dont really
need it in my desktop app.

JK

On Thu, Dec 23, 2010 at 11:27 PM, Emmanuel Lecharny <elecharny@gmail.com> wrote:
> On 12/23/10 11:30 PM, Jan Kotek wrote:
>>
>> Hi,
>>
>> I am proud to announce stable release of JDBM2. It is 1.0 fork which
>> adds lot of stuff, most notably:
>>  * java.util.Map view to indexes
>>  * soft cache
>>  * secondary map (aka foreign indexes in SQL)
>>  * better speed
>>  * defragmentation
>>  * more space efficient
>>  * under Apache 2 license.
>
> Great !!!
>>
>> However it does not solve biggest problem you had with 1.0. There is
>> still 'big lock' and concurrency access does not scale well. Readonly
>> access is very fast, thanks to soft cache.
>
> Yeah, at this point, we need something like MVCC implemented in JDBM 3.0 to
> get it more scalable. Cache can help, but has its limit.
>
> An interesting next step :)
>
>> API and file store format are similar, but incompatible with 1.0
>
> Will give it a try and see if it still works well with ADS.
>
>
> --
> Regards,
> Cordialement,
> Emmanuel Lécharny
> www.iktek.com
>
>

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