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From Emmanuel Lecharny <elecha...@gmail.com>
Subject Re: JDBM2 released
Date Thu, 23 Dec 2010 23:27:13 GMT
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 L├ęcharny
www.iktek.com


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