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From "Plüm, Rüdiger, VF-Group" <ruediger.pl...@vodafone.com>
Subject Re: FLUSH, filtering, setaside, etc (was Re: Problems with EOSoptimisation in ap_core_output_filter() and file buckets.)
Date Fri, 20 Feb 2009 11:11:45 GMT
 

> -----Ursprüngliche Nachricht-----
> Von: Joe Orton 
> Gesendet: Freitag, 20. Februar 2009 10:15
> An: dev@httpd.apache.org
> Betreff: Re: FLUSH, filtering, setaside, etc (was Re: 
> Problems with EOSoptimisation in ap_core_output_filter() and 
> file buckets.)
> 
> On Thu, Feb 19, 2009 at 10:00:50PM +0100, Ruediger Pluem wrote:
> > On 02/19/2009 12:32 PM, Joe Orton wrote:
> ...
> > > @@ -497,13 +500,17 @@
> > >                  next = APR_BUCKET_NEXT(bucket);
> > >              }
> > >              bytes_in_brigade += bucket->length;
> > > -            if (!APR_BUCKET_IS_FILE(bucket)) {
> > > +            if (APR_BUCKET_IS_FILE(bucket)) {
> > > +                num_files_in_brigade++;
> > > +            } 
> > > +            else {                
> > >                  non_file_bytes_in_brigade += bucket->length;
> > >              }
> > >          }
> > >      }
> > >  
> > > -    if (non_file_bytes_in_brigade >= THRESHOLD_MAX_BUFFER) {
> > > +    if (non_file_bytes_in_brigade >= THRESHOLD_MAX_BUFFER
> > > +        || num_files_in_brigade >= THRESHOLD_MAX_FILES) {
> > 
> > If the 16 FD's were split over more then one brigade and the
> > brigades before us were set aside the FD's belong already 
> to the wrong pool
> > (the connection pool). Deleting a file bucket doesn't close 
> the FD it uses.
> 
> Not sure what the concern is there - this loop is iterating over the 
> concatenation of the buffered brigade an the "new" brigade 
> (right?), so 
> it will count the total number of buckets which are potentially left 
> buffered after this c_o_f invocation terminates.

The problem is that originally the apr_file objects are created in the
request pool. If you now sent two brigades down the chain, let's say
the first one with 15 files and the second one with 1 file and the first
one gets set aside for later writing for whatever reason then the 15
apr_file objects from the first brigade move over to the connection
pool and thus do not get closed until the connection gets closed (which
may take a long time). This is where the leak happens.
So I guess for a final solution we must find a way to avoid set asides
in the connection pool.

Regards

Rüdiger


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