[Pvfs2-developers] trove method

[Murali Vilayannur]

Hi Sam,
Just one minor comment on the issue of specifying the trove method in 
the config file..
Can't we store the trove method names in the collections.db? We already 
store the version string, right?
If we do the above, then we can have mkspace take in a parameter 
(command line) the dbpf method name which
we can store it into the db without hardcoding anything..
My 2 cents :)
otherwise looks good!
Thanks,
Murali
>
> I've attached a patch that provides support for different trove 
> methods (currently we only have dbpf).  It also changes Phil's alt-aio 
> implementation a little to be a separate trove method (using most of 
> the dbpf code).
>
> The motivation for this is to allow multiple different trove methods 
> to be supported, and switch easily from one to another.  My next step 
> is to modify Julian's version of dbpf that provides multiple threads 
> support so that it works as a separate trove method as well.
>
> One issue I'm still not sure about:  I allowed the trove method to be 
> specified as part of the Defaults context in the config file, as well 
> as in each one of the Filesystem contexts (overrides the default).  
> The problem with specifying a different method for each filesystem is 
> that the dbpf implementation stores info about the filesystems in the 
> collections.db.  Does it make sense to only specify a trove method for 
> the entire storage space?
>
> Also, there are some utilities (mkspace for example) that don't read 
> in the config files, so they don't know what trove method has been 
> specified.  Right now I'm just hardcoding the dbpf method, but that 
> means that we can't really use a different trove method to provide a 
> different storage format.  Not that we would ever want to...
>
> I'd like to commit this stuff sometime soon.  Please let me know if 
> there are any objections or comments.
>
> Thanks,
>
> -sam
>
>
>
>
>
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