Great-- thanks for the info.
For now, hopefully I can get the behaviour I want by sticking a .Call(
'R_lazyLoadDBflush'...) [as per 'detach'] before calling 'lazyLoad'. Seems to
work on my examples, but please let me know if you don't think it'll work
generally-- if not, I could presumably create the files under different names
and then change them.
Is there merit in making 'makeLazyLoadDB' public, just as 'lazyLoad' already
is? It's useful.
Mark
--
Mark Bravington
CSIRO Mathematical & Information Sciences
Marine Laboratory
Castray Esplanade
Hobart 7001
TAS
ph (+61) 3 6232 5118
fax (+61) 3 6232 5012
mob (+61) 438 315 623
l...@stat.uiowa.edu wrote:
> Here is a more stripped down variant generates and error on OS X for
> me:
>
> mkEg <- function(tm) list(scrunge = as.POSIXct(tm))
>
> extract <- function(db) {
> e<- new.env()
> lazyLoad(db, e)
> as.list( e)
> }
>
> eg <- mkEg("2009-11-04 12:49:53")
> eg1 <- mkEg("2009-11-04 12:49:28")
>
> tools:::makeLazyLoadDB( eg, '/tmp/ll')
> extract('/tmp/ll') # force; OK
>
> tools:::makeLazyLoadDB( eg1, '/tmp/ll')
> extract('/tmp/ll')
>
> Changing the second set of /tmp/ll makes the symptom go away.
>
> I believe this comes down to unintended use of the lazyload mechanism
> -- in particular it is not intended that a database be rewritten
> after it has been loaded. There is a chaching mechanism for improved
> performance on slow file systems, and I believe what is happening is
> that the new indices are being used to look in the old chached data.
> There might be some merit in having lazyLoad call R_lazyLoadDBflush.
>
> luke
>
> On Tue, 3 Nov 2009, Seth Falcon wrote:
>
>> Hi,
>>
>> On 11/3/09 6:51 PM, mark.braving...@csiro.au wrote:
>>>
>>> file.copy( 'd:/temp/Rdiff.Rd', 'd:/temp/scrunge.Rd') # Rdiff.Rd
>>> from 'tools' package source
>>>
>>> eglist<- list( scrunge=parse_Rd( 'd:/temp/scrunge.Rd'))
>>> tools:::makeLazyLoadDB( eglist, 'd:/temp/ll')
>>> e<- new.env()
>>> lazyLoad( 'd:/temp/ll', e)
>>> as.list( e) # force; OK
>>>
>>> eglist1<- list( scrunge=parse_Rd( 'd:/temp/Rdiff.Rd'))
>>> tools:::makeLazyLoadDB( eglist1, 'd:/temp/ll')
>>> e<- new.env()
>>> lazyLoad( 'd:/temp/ll', e)
>>> as.list( e) # Splat
>>>
>>> It doesn't make any difference which file I process first; the error
>>> comes the second time round.
>>
>> If I adjust this example in terms of paths and run on OS X, I get the
>> following error on the second run:
>>
>>> as.list(e) # Splat
>> Error in as.list.environment(e) : internal error -3 in R_decompress1
>>
>> I haven't looked further yet.
>>
>> + seth
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-devel
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