Hi Elisa,
On Aug 26, 2010, at 4:02 PM, elisa sibarani wrote:
> Hi Quincey,
>
> Thank you for your answer. It is indeed help so much, but is it possible that
> the next release (1.10.0) is already finish and when will be the distribution
> of the new library?
The 1.10.0 is not finished yet and may not be ready for another 6+
months.
> Where can I find the proposal documentation or any kind of document which
> explain about the journaling metadata and the mirroring virtual file driver
> for replication?
Here's the URL for the metadata journaling RFC:
http://www.hdfgroup.org/pubs/rfcs/Metadata_Journaling_RFC.pdf
The mirroring VFD was just an idea I've tossed around, it's not
implemented (or on our current plan to implement) and doesn't have an RFC
describing it. I don't think it would be too difficult to implement however,
if you'd like to give it a try.
Quincey
> Thank you so much
>
> Regards,
> Elisa
>
> --- On Thu, 8/19/10, Quincey Koziol <[email protected]> wrote:
>
> From: Quincey Koziol <[email protected]>
> Subject: Re: [Hdf-forum] Handle concurrency, transaction (or any features
> provided) in HDF5 compare to SQL Server
> To: "HDF Users Discussion List" <[email protected]>
> Date: Thursday, August 19, 2010, 8:04 AM
>
> Hi Elisa,
>
> On Aug 18, 2010, at 9:57 AM, elisa sibarani wrote:
>
> > what I mean is not really the same feature as SQL Server has, but all
> > features regarding reading from a file. I've read your reply to hdf forum
> > as follows:
> >
> > True concurrent access to a file when it is being written to is not
> > currently supported. We are working to add a single-writer/multiple-reader
> > access mode for the next release (1.10.0), but it's not available yet. The
> > current way to have pseudo-concurrent access to a file is found here:
> > http://www.hdfgroup.org/hdf5-quest.html#grdwt
> >
> > Quincey
> >
> > therefore, this H5Fflush is able to handle concurrency for reading a file?
>
> Yes, when the SWMR feature is finished, it will support a particular form
> of concurrent access to HDF5 files. Along those "database" lines, we are
> finishing up support for journaling metadata updates to HDF5 files, which
> resembles transactions on modifications to HDF5 files, at least in the sense
> that all the changes from an HDF5 API routine will either be atomically
> reflected in the file, or not. It is also possible to implement a
> "mirroring" virtual file driver for replicating modifications to HDF5 files,
> although we don't have one currently implemented.
>
> Quincey
>
> > thanks
> >
> >
> >
> > --- On Wed, 8/18/10, Quincey Koziol <[email protected]> wrote:
> >
> > From: Quincey Koziol <[email protected]>
> > Subject: Re: [Hdf-forum] Handle concurrency, transaction (or any features
> > provided) in HDF5 compare to SQL Server
> > To: "HDF Users Discussion List" <[email protected]>
> > Date: Wednesday, August 18, 2010, 9:47 AM
> >
> > Hi Elisa,
> >
> > On Aug 18, 2010, at 12:28 AM, elisa sibarani wrote:
> >
> > > Hi all,
> > >
> > > I want to ask is there anyone of you can shares information about HDF5
> > > features available until now? If I want to recommend my company to use
> > > HDF5, now I have to make sure it'll work at least as reliable as SQL
> > > Server. Therefore, I want to make a comparison about services/features
> > > available in SQL Server such as transaction (locking process),
> > > concurrency, replication (for back up) and so on. How I can get such
> > > information about HDF5?
> >
> > HDF5 does not have transactions, concurrency or replication features.
> > It is not a database. It is designed for storing and sharing large
> > array-like datasets in a hierarchically structured file (see
> > http://www.hdfgroup.org/HDF5/whatishdf5.html for some more details and
> > documentation).
> >
> > Quincey
> >
> > > Or maybe if anyone has experience (at least once) to move from SQL Server
> > > to HDF5, maybe you can share about what list of things I should put in
> > > mind for this changes?
> > >
> > > Thanks all.
> > >
> > > Regards,
> > > Elisa
> > >
> > > _______________________________________________
> > > Hdf-forum is for HDF software users discussion.
> > > [email protected]
> > > http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
> >
> >
> > _______________________________________________
> > Hdf-forum is for HDF software users discussion.
> > [email protected]
> > http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
> >
> >
> > _______________________________________________
> > Hdf-forum is for HDF software users discussion.
> > [email protected]
> > http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> [email protected]
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
>
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> [email protected]
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
