From: ara.t.howard@...
Date: 2006-04-30T02:42:39+09:00
Subject: Re: [ANN] rq-2.3.2

On Sat, 29 Apr 2006, Guillaume Marcais wrote:

> I couldn't find the changes list. What is new in this version?
>
> Guillaume.

sorry.  here you go

   http://www.codeforpeople.com/lib/ruby/rq/rq-2.3.2/HISTORY

   ---
   2.3.2:
     - added 'rq q io' command
     - streamlined 'rq q status' output considerably
     - fixed few small bugs in util.rb
     - patched yaml inline behaviour for syck in 1.8.4.  backward compatible with
       older ruby versions - at least through 1.8.2.
     - changed naming scheme for rotation and added automatic attempt to compress
       the rotation
     - made shutdown via ctrl-c when running from commandline (as opposed to
       daemon) quieter
     - fixed a few bad exit codes, for example creating a queue exited with
       $?==1, it is now correctly 0
     - added support for job stdin to be provided and stdout/stderr captured.
       for instance

         rq queue submit cat --stdin=input_for_cat.txt

         cat input_for_cat.txt | rq queue submit cat --stdin=-

         rq queue submit cat --stdin=- < input_for_cat.txt

       stdout and stderr are stored in the queue directory in a file named by
       jid.
     - changed behaviour of reading jobs from stdin: ***IMPORTANT*** : it's now
       **REQUIRED** to provide a '-' as the argument for any command that should
       read from stdin.  for instance one would use

         rq queue submit - < joblist
       or
         jobgenerator.rb | rq queue submit -

       vs the old

         rq queue submit < joblist
       or
         jobgenerator.rb | rq queue submit


       the distiction was added to make running submissions from scripts/cron
       (where STDIN.tty? == false) easier and providing the job stdinput on stdin
       possible.
     - added a restart mode to restart a feeder : rq q restart
     - modes shutdown, stop, and restart now return a non-zero exit code if they
       fail to signal the feeder, zero otherwise
     - fixed bug with restart mode whereby re-exec failed due to falsely thinking
       pid was locked (it is - but only by the current process!)
     - added default bin dir underneath q dir.  this dir is added to the path
       before excuting commands to it's an easy place to put things where they'll
       be found


the biggest change is the ability to provide jobs stdin at submit time and to
capture their stdout/stderr.  for instance you can now do this

   rq q submit cat --stdin=/etc/passwd

or

   find | grep *geo.tif | rq q submit geolocate.rb --stdin=-

to submit jobs that take stdin.  the stdin is squirled away in the q dir.
later, when the job is run, the stdout and stderr are captured in the same
way.  so, in the above example, if the submitted job had jid=42 you'd have

   q/stdin/42  # the stdin provided

before the job was run and

   q/stdin/42
   q/stdout/42
   q/stderr/42

once the job was set running.  this is extrememly cool since you can do

   tail -F q/stderr/42

to monitor a process on a remote node.

cheers.

-a
-- 
some people, sweet and attractive, and strong and healthy, happen to die
young.  they are masters in disguise teaching us about impermanence.
- h.h. the 14th dali lama