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Today's Topics:
1. 504 Gateway Timeout Error while processing big data files
(Tushar Dave)
2. Dancer2 0.152000 on its way to CPAN (Sawyer X)
3. Re: 504 Gateway Timeout Error while processing big data files
(Hugues)
----------------------------------------------------------------------
Message: 1
Date: Mon, 13 Oct 2014 09:45:12 -0400
From: Tushar Dave <tushardave26@gmail.com>
To: dancer-users@dancer.pm
Subject: [dancer-users] 504 Gateway Timeout Error while processing big
data files
Message-ID:
<CA+8TAD=AV+-bPirEK_HtJKV6MzPSsicU+hHWES-ZWvDu30AQqg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello,
I am working on my Dancer Project (using Perl 5.20.0, apache2, RHEL 6 and
Dancer) in which I am providing a web form to user. When user submits the
form with appropriate values, a Q-Q plot will be generated by R code on
backend. Once the plot is available on server I am sending user an email
with the link of generated plot.
My code works completely fine with smaller data file (e.g. 100KB ? 10 MB)
upload. But, if user uploads the large data files (e.g. > 30MB), the upload
works fine but processing of data and generating of plot will take more
time which caused 504 Gateway Time Out Error. I can use below options to
resolve this.
(1) Change Time Out time in apache configuration file
(2) Submit a job through batch queuing system such as SGE
(3) Use Proc::Simple or Proc::Background to run the process in background
and keep checking whether process is running in background or not.
I am using the 3rd option. What I am trying to do is I am using
Proc::Simple to run Perl-R-code (i.e. listed in below list as 2) in
background. Then I am using poll() method of Proc::Simple to check whether
the process is running or not. If the process is running, render a template
that shows user that process is still running. When process is finished,
render another template with generated Q-Q plot. Below are my codes:
(1) Dancer code under lib/ ---- http://pastebin.com/QGCFtq2X
<http://l.facebook.com/l.php?u=http%3A%2F%2Fpastebin.com%2FQGCFtq2X&h=rAQEet8kg&enc=AZPs41qoqJIPTpi-4sL7ICzxgTszmdLN8joWBwLuzcrfK9vRcRfNFMBkMwQ469-n_nstqwOwtAbH-nmvLQ2wpy562EF9ef2zhBcdAmH-VMVJ0hxvwzRz0I7PTKh3UXO8cLkyOO0FHwL87zQbk5K3hOlh&s=1>
(2) Perl + R code that generate Q-Q plot ----http://pastebin.com/U5hg45dQ
(3) qqPlot.tt ---- http://pastebin.com/u30XArVr
(4) processing.tt ---- http://pastebin.com/RSH1kptp
<http://l.facebook.com/l.php?u=http%3A%2F%2Fpastebin.com%2FRSH1kptp&h=RAQE1lHBj&enc=AZNQgweLY1hC15HguQHmiCGzFR4PmjOnNATBVnN1R6YQAB5GTbq8HVyUgPioxTRgWi5Ixb2d4HXAkvB9XC8336gnmRWA-ARYheUbQ0LrUZRyaQI_lpMVDD_D9ZL-F-79X6a4ZlLInL6O6QOknwU9RBpX&s=1>
The problem I am facing right now that my Dancer code (i.e. listed as 1
above) execute while loop on line 77 of (1) but the template ?processing.tt?
is not coming up on browser. I don?t know what am I doing wrong?
Can someone help me to figure out my error? Or please suggest me any other
way to resolve Gateway Time Out Error.
Thanks for any help.
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------------------------------
Message: 2
Date: Tue, 14 Oct 2014 04:49:05 +0200
From: Sawyer X <xsawyerx@gmail.com>
To: Perl Dancer users mailing list <dancer-users@dancer.pm>
Subject: [dancer-users] Dancer2 0.152000 on its way to CPAN
Message-ID:
<CAMvkq_Tvx07eM=TK+ww8mung2UpiAX89ayWzxof5=zTiOcxe-w@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi everyone!
We've done quite a few big things in Dancer2 and I'd like to share them. I
haven't sent an email about 0.151000 - released last week - so I'm going to
share some information about it too.
These two versions provide a few important changes:
* Introducing our policy document.
* Dancer2 Apps (Dancer2::Core::App) now build proper PSGI applications - *each
on its own*. This allows you to create much better PSGI apps, which will
interact much better. This will also disallow things we do not recommend,
such as "pass" and "forward" between Dancer Apps. The original `psgi_app`
keyword (and Dancer2 method) still works, just as before, providing the old
behavior.
* We added a migration document, for those moving from Dancer to Dancer2,
thanks to Snigdha Dagar.
* There is a big "chat with us" banner on MetaCPAN.org, to help newbies
join the IRC channel.
* New 'content' keyword to set content in a declarative manner.
The first two are the biggest ones. I will email the list about both of
those separately.
I would like to congratulate and thank all those who worked on this
release: Andy Beverley, D?vid Kov?cs, DavsX, Paul
Cochrane, simbabque, Lindsey Beesley, Snigdha Dagar, Russell Jenkins, and
yours truly, Sawyer X.
Great work, everyone!
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Message: 3
Date: Tue, 14 Oct 2014 11:02:00 +0200
From: Hugues <hugues@max4mail.com>
To: dancer-users@dancer.pm
Subject: Re: [dancer-users] 504 Gateway Timeout Error while processing
big data files
Message-ID: <543CE688.4000701@max4mail.com>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Hello Dave
for my point of view , the problem come from file
http://pastebin.com/QGCFtq2X
<http://l.facebook.com/l.php?u=http%3A%2F%2Fpastebin.com%2FQGCFtq2X&h=rAQEet8kg&enc=AZPs41qoqJIPTpi-4sL7ICzxgTszmdLN8joWBwLuzcrfK9vRcRfNFMBkMwQ469-n_nstqwOwtAbH-nmvLQ2wpy562EF9ef2zhBcdAmH-VMVJ0hxvwzRz0I7PTKh3UXO8cLkyOO0FHwL87zQbk5K3hOlh&s=1>
line 77 to 80
while ($process->poll()) {
template 'processing.tt';
sleep 10;
}
first time it's work, but after not , every 10 sec you send
processing.tt to your browser ( first time ,
browser ask 1 anwers, not more , and that all )
you need to use ajax
1) launch in background your process (and create PID to locate your
process, https://metacpan.org/pod/Unix::PID )
2) add javascript in your brower to update result ( see example below )
3) add route
ajax '/myProcesss' {
If ( $PID ) {
... in course
} else {
... process over
}
}
see fun example
http://advent.perldancer.org/2011/14
bye
Hugues
Le 13/10/2014 15:45, Tushar Dave a ?crit :
>
> Hello,
>
> I am working on my Dancer Project (using Perl 5.20.0, apache2, RHEL 6
> and Dancer) in which I am providing a web form to user. When user
> submits the form with appropriate values, a Q-Q plot will be generated
> by R code on backend. Once the plot is available on server I am
> sending user an email with the link of generated plot.
>
> My code works completely fine with smaller data file (e.g. 100KB ? 10
> MB) upload. But, if user uploads the large data files (e.g. > 30MB),
> the upload works fine but processing of data and generating of plot
> will take more time which caused 504 Gateway Time Out Error. I can use
> below options to resolve this.
>
> (1) Change Time Out time in apache configuration file
> (2) Submit a job through batch queuing system such as SGE
> (3) Use Proc::Simple or Proc::Background to run the process in
> background and keep checking whether process is running in background
> or not.
>
> I am using the 3rd option. What I am trying to do is I am using
> Proc::Simple to run Perl-R-code (i.e. listed in below list as 2) in
> background. Then I am using poll() method of Proc::Simple to check
> whether the process is running or not. If the process is running,
> render a template that shows user that process is still running. When
> process is finished, render another template with generated Q-Q plot.
> Below are my codes:
>
> (1) Dancer code under lib/ ---- http://pastebin.com/QGCFtq2X
> <http://l.facebook.com/l.php?u=http%3A%2F%2Fpastebin.com%2FQGCFtq2X&h=rAQEet8kg&enc=AZPs41qoqJIPTpi-4sL7ICzxgTszmdLN8joWBwLuzcrfK9vRcRfNFMBkMwQ469-n_nstqwOwtAbH-nmvLQ2wpy562EF9ef2zhBcdAmH-VMVJ0hxvwzRz0I7PTKh3UXO8cLkyOO0FHwL87zQbk5K3hOlh&s=1>
> (2) Perl + R code that generate Q-Q plot ----http://pastebin.com/U5hg45dQ
> (3) qqPlot.tt ---- http://pastebin.com/u30XArVr
> (4) processing.tt <http://processing.tt> ----
> http://pastebin.com/RSH1kptp
> <http://l.facebook.com/l.php?u=http%3A%2F%2Fpastebin.com%2FRSH1kptp&h=RAQE1lHBj&enc=AZNQgweLY1hC15HguQHmiCGzFR4PmjOnNATBVnN1R6YQAB5GTbq8HVyUgPioxTRgWi5Ixb2d4HXAkvB9XC8336gnmRWA-ARYheUbQ0LrUZRyaQI_lpMVDD_D9ZL-F-79X6a4ZlLInL6O6QOknwU9RBpX&s=1>
>
> The problem I am facing right now that my Dancer code (i.e. listed as
> 1 above) execute while loop on line 77 of (1) but the template
> ?processing.tt <http://processing.tt>? is not coming up on browser. I
> don?t know what am I doing wrong?
>
> Can someone help me to figure out my error? Or please suggest me any
> other way to resolve Gateway Time Out Error.
>
> Thanks for any help.
>
>
>
>
>
> _______________________________________________
> dancer-users mailing list
> dancer-users@dancer.pm
> http://lists.preshweb.co.uk/mailman/listinfo/dancer-users
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