Bug #50521 for HTML-CTPP2:

Thu Oct 15 07:59:21 2009 andrey [...] kostenko.name - Ticket created

If structure has backreferences, even weaked, HTML::CTPP2 hangs, eats our RAM and stores its dump in /spool/core :-) e.g.: $tree->{children} = [ { name => 'ch1', parent => $tree }, { name => 'ch1', parent => $tree }, ]

Thu Oct 15 09:05:45 2009 http://slonik-v-domene.livejournal.com/ - Correspondence added

Чтв. Окт. 15 07:59:21 2009, GUGU писал: Show quoted text

> If structure has backreferences, even weaked, HTML::CTPP2 hangs, eats > our RAM and stores its dump in /spool/core :-) > e.g.: > $tree->{children} = [ > { name => 'ch1', parent => $tree }, > { name => 'ch1', parent => $tree }, > ]

Never use backreferences in your data structures, it's crap. This is no bug, no fixes need.

Thu Oct 15 09:05:48 2009 The RT System itself - Status changed from 'new' to 'open'

Thu Oct 15 09:32:24 2009 andrey [...] kostenko.name - Correspondence added

Чтв. Окт. 15 09:05:45 2009, http://slonik-v-domene.livejournal.com/ писал: Show quoted text

> Чтв. Окт. 15 07:59:21 2009, GUGU писал:

> > If structure has backreferences, even weaked, HTML::CTPP2 hangs, eats > > our RAM and stores its dump in /spool/core :-) > > e.g.: > > $tree->{children} = [ > > { name => 'ch1', parent => $tree }, > > { name => 'ch1', parent => $tree }, > > ]

> > Never use backreferences in your data structures, it's crap. > > This is no bug, no fixes need.

Crap is a module, which can't handle them :-) There are a lot of useful cyclic structures. Perl has a feature, which allows to work with cyclic structures (weak references) and a lot of modules creates back-referenced structures.

Thu Oct 15 09:50:36 2009 http://slonik-v-domene.livejournal.com/ - Correspondence added

Show quoted text

> Crap is a module, which can't handle them :-)

Really? Show quoted text

> There are a lot of useful cyclic structures. Perl has a feature, which > allows to work with cyclic structures (weak references) and a lot of > modules creates back-referenced structures.

Backreferences as template parameters are completely bad data structure. By design.

Thu Oct 15 10:00:25 2009 andrey [...] kostenko.name - Correspondence added

Чтв. Окт. 15 09:50:36 2009, http://slonik-v-domene.livejournal.com/ писал: Show quoted text

> > Crap is a module, which can't handle them :-)

> > Really? >

Really. Imagine that all modules will use all your memory and make a segfault instead of pretty error messages. Show quoted text

> > There are a lot of useful cyclic structures. Perl has a feature, which > > allows to work with cyclic structures (weak references) and a lot of > > modules creates back-referenced structures.

> > Backreferences as template parameters are completely bad data > structure. By design.

I don't want to remove link to parent in my tree only because you think that "Backreferences as template parameters are completely bad data structure". I already have a structure, which I want to display.

Thu Oct 15 10:17:17 2009 http://slonik-v-domene.livejournal.com/ - Correspondence added

Show quoted text

> > > Crap is a module, which can't handle them :-)

> > > > Really? > >

> Really. Imagine that all modules will use all your memory and make a > segfault instead of pretty error messages.

I have simple solution that 100% works: Just throw away this data structure. CTPP works in Rambler (http://rambler.ru/) and handles billions of requests without any problem. Show quoted text

> > > There are a lot of useful cyclic structures. Perl has a feature,

which Show quoted text

> > > allows to work with cyclic structures (weak references) and a lot

of Show quoted text

> > > modules creates back-referenced structures.

> > > > Backreferences as template parameters are completely bad data > > structure. By design.

Show quoted text

> I already have a structure, which I want to display.

1. Switch to another template engine. OR 2. Write patch for YOUR code and remove backreferences OR 3. Write patch for CTPP2.xs and send it to me Currently, I have no time to fix this feature.

Thu Oct 15 10:24:42 2009 andrey [...] kostenko.name - Correspondence added

Чтв. Окт. 15 10:17:17 2009, http://slonik-v-domene.livejournal.com/ писал: Show quoted text

> > > > Crap is a module, which can't handle them :-)

> > > > > > Really? > > >

> > Really. Imagine that all modules will use all your memory and make a > > segfault instead of pretty error messages.

> > I have simple solution that 100% works: > > Just throw away this data structure. CTPP works in Rambler > (http://rambler.ru/) and handles billions of requests without any > problem. >

> > > > There are a lot of useful cyclic structures. Perl has a feature,

> which

> > > > allows to work with cyclic structures (weak references) and a lot

> of

> > > > modules creates back-referenced structures.

> > > > > > Backreferences as template parameters are completely bad data > > > structure. By design.

>

> > I already have a structure, which I want to display.

> > 1. Switch to another template engine. > > OR > > 2. Write patch for YOUR code and remove backreferences > > OR > > 3. Write patch for CTPP2.xs and send it to me > > Currently, I have no time to fix this feature.

I've switched back to Template::Toolkit. This bugreport is only an answer for users' questions like "WTF my program receives segfault?" Maybe somebody will fix it