[ZODB-Dev] Scalable Container for Log-Entries

[Thomas Guettler]

Am Mittwoch, 28. Januar 2004 16:04 schrieben Sie:
> On Wed, 28 Jan 2004 10:44:01 +0100
>
> Thomas Guettler <hv at tbz-pariv.de> wrote:
> > Hi!
> >
> > How would you code a scalable container which holds
> > log-entries ordered by the time the data was inserted into
> > the container.
> >
> > There are several process which add log-entries (ZEO + Filestorage).
> > The API is very simple:
> >
> > 1. logContainer.add(data)
> > 2. data_list=logContainer.get(from_date, to_date)
> >
> > I think of a BTree with the time as key. The time in seconds
> > since 1970 is not enough because there will be several
> > log entries per second. If you have an other solution, please
> > let me know.
>
> The float value returned by time should be OK, but the resolution of it
> may not be good enough in your application. The resolution varies by
> platform AFAIK, but I'm not sure if this is a problem in your case.

It seems to be OK. I am running this script since 
several minutes:

frac=1000000
while 1:
    now=time.time()
    now2=time.time()
    now=long(now*frac)
    now2=long(now2*frac)
    if now==now2:
        raise("Equal: %s" % now)

> You could also consider putting the log in a separate storage so that it
> doesn't content with access to the main storage server. This could be
> done later, however.

I want to log references to objects (not strings). I think this is not 
possible if I use serveral storages.

 thomas