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Posted to dev@directory.apache.org by Jan Kotek <op...@gmail.com> on 2010/12/23 23:30:34 UTC
JDBM2 released
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.
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.
API and file store format are similar, but incompatible with 1.0
http://code.google.com/p/jdbm2/
http://www.kotek.net/blog/jdbm2_released
Regards,
Jan Kotek
Re: JDBM2 released
Posted by Jan Kotek <op...@gmail.com>.
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 <el...@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
>
>
Re: JDBM2 released
Posted by Emmanuel Lecharny <el...@gmail.com>.
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