[Swift-user] Error: Attempted to close nonexistent channelbuffers

[Mihael Hategan]

What Ben said applies. You should not see this error if the workflow is
otherwise correct.

You can also try one of the latest nightly builds.

Mihael

On Thu, 2007-09-13 at 16:24 -0400, Allen, M. David wrote:
> I'm using vdsk-0.2, downloaded yesterday.
> 
> 
>  
> 
> -----Original Message-----
> From: Mihael Hategan [mailto:hategan at mcs.anl.gov] 
> Sent: Thursday, September 13, 2007 4:22 PM
> To: Allen, M. David
> Cc: swift-user at ci.uchicago.edu
> Subject: Re: [Swift-user] Error: Attempted to close nonexistent
> channelbuffers
> 
> What version are you using?
> That error shows a bug in the Swift implementation, and it should have
> been fixed, at least in SVN.
> 
> Mihael
> 
> On Thu, 2007-09-13 at 14:36 -0400, Allen, M. David wrote:
> > Hello,
> > 
> > I'm just getting started with Swift, and trying to program a fairly
> > trivial sample to get started.
> > 
> > My swiftscript fails with the message:
> > "Execution failed:
> >         grep started
> > Attempted to close nonexistent channel buffers"
> >  
> > Can anyone point me to the documentation that describes such errors?
> > This is referring to a spot in my code that is executing a very
> > vanilla grep operation.  My input file is just 14 lines long, and
> this
> > error consistently happens towards the end of the overall workflow
> > execution.
> >  
> > The code:
> >  
> > type blog {
> >     string name;
> >     string feedURL;
> > }
> >  
> > type file { }
> >  
> > (file headlines) getHeadlines(blog b) {
> >         app {
> >                 feeder @b.feedURL stdout=@filename(headlines);
> >         }
> > }
> >  
> > (file results[]) processBlogs(blog blogs[]) {
> >  
> >         foreach blog el, index in blogs {
> >                 results[index] = getHeadlines( el ) ;
> >         }
> > }
> >  
> > (string matches) findSingleMatch(file input, string searchTerm) {
> >         app {
> >                 grep "-i" searchTerm @filename(input)
> stdout=@matches;
> >         }
> > }
> >  
> > (file matches) findMatches(file inputs[], string searchTerm) {
> >         string final;
> >  
> >         foreach input, index in inputs {
> >                 string intermed = findSingleMatch(input, searchTerm);
> >                 final = strcat(final, intermed);
> >         }
> >  
> >         matches = dumpString(final);
> > }
> >  
> > (int retVal) debug(string m) {
> >         app {
> >                 echo m ;
> >         }
> > }
> >  
> > (file t) dumpString(string m) {
> >     app {
> >         echo m stdout=@filename(t);
> >     }
> > }
> >  
> > blog blogs[]  <csv_mapper; file="blogs.csv", delim=",",
> > header="true">;
> > file output[] <simple_mapper;
> > prefix="output/blogHeadlines",suffix=".txt">;
> > file final <simple_mapper; prefix="output/result", suffix=".txt">;
> >  
> > output = processBlogs(blogs);
> > final = findMatches(output, "ARG 0");
> > 
> > Any help would be greatly appreciated.
> > --
> > M. David Allen
> > _______________________________________________
> > Swift-user mailing list
> > Swift-user at ci.uchicago.edu
> > http://mail.ci.uchicago.edu/mailman/listinfo/swift-user
>