HELP! Rake aborted! Can't modify frozen hash

Too bad even the trace doesn’t say which hash is involved.

Sorry this post is long: am trying to provide enough context to be
meaningful.

Occurs intermittently when rake jobs:work is pulling a command out of
delayed_jobs while my status observer is in the process of parsing a log
file for detailed results of the previous delayed_job denizen. I have
an observer class (in RAILS_ROOT/lib ) which listens for the events,
makes a copy of them and calls the owner class ( in apps/models ) which
then calls on the log parser (also in /lib) to do the actual work.
(Should both of those classes, the observer and the parser be in
app/models?)

Am due to deliver this application in a few days and this is killing it
(and me).

Am using DirectoryWatcher to look for flag files that indicate the start
and finish of the delayed_jobs.
That is started at the end of environment.rb like this:

require ‘directory_watcher’
$scriptStatusObserver = ScriptStatusObserver.new
dirToWatch ="#{RAILS_ROOT}/tmp/flags"
$directoryWatcher = DirectoryWatcher.new( dirToWatch )
$directoryWatcher.glob= “*.flg”
$directoryWatcher.interval=(15)
$directoryWatcher.add_observer( $scriptStatusObserver )
$directoryWatcher.persist=("#{RAILS_ROOT}/tmp/flags/dw_state.yml")
$directoryWatcher.start

at_exit { $directoryWatcher.stop }

This code is outside of the run method (btw is that the best place or is
inside the run better?)

Here is the observer:
require ‘script_run’

class ScriptStatusObserver

def initialize
@rcvdEvents = []
end

def update( *events )
begin
puts “#{LINE.to_s}: ScriptStatusObserver events:
\n”+events.to_yaml
cnt = 0

  events.each do |e|
    if e.to_s.match(/^\s*added/)
      cnt = cnt + 1
    @rcvdEvents << e
    end
  end

  ScriptRun.new.catch_up( @rcvdEvents ) if cnt > 0

  @rcvdEvents.clear

rescue
  puts $!
end

end
end

Here is ScriptRun (it attaches to an associative table built with
has_many:through)

#require ‘observer’

class ScriptRun < ActiveRecord::Base

set_table_name “scripts_runs”
belongs_to :script
belongs_to :run

def parse( result )
parser = LogParser.new
parser.parse(result)
end

def catch_up( events )
events.each do |e|
typ = e.type
path = e.path

  thisMatch = path.match(/flags\/(\d+)_(\d+)_([\d\.]+)_(\w+)\.flg/)
  run_id    = thisMatch[1]
  script_id = thisMatch[2]
  ts        = thisMatch[3]
  status    = thisMatch[4]

  if e.to_s.match(/^\s*added/)
    status_update( script_id, run_id, status, ts, path )
  end
end

end

def status_update( script_id, run_id, status, ts, path )

scriptrun = ScriptRun.find(:first, :conditions => [ "run_id = ? and

script_id = ?", run_id.to_i, script_id.to_i ])

if scriptrun.kind_of?(ScriptRun)
  currStatus = scriptrun.status
  if not currStatus == 'completed'

    scriptrun.update_attribute(:status, status)

    if status == 'parse'
      flag    = File.new(path)
      logSpec = flag.gets
      flag.close

      logName  = File.basename(logSpec)
      logPath  = logSpec.sub(logName, '')

      logName =~ /^(([\w_]+)_([\w]+)_(\d+))\.log$/
      name     = $1
      basename = $2
      runenv   = $3
      tsOrPid  = $4

      result           = Result.new
      result.log_path  = logPath
      result.basename  = basename
      result.name      = name
      result.script_id = script_id.to_i
      result.run_id    = run_id.to_i
      if runenv == 'sit'
          runenv = 'SIT3348'
      end
      result.application_environment_id =
            ApplicationEnvironment.find(:first, :conditions => [

“nodename = ?”, runenv]).id

      parse(result)

      if run_completed?( run_id )
        myRun = Run.find(run_id.to_i)
        if myRun.kind_of?( Run )
          myRun.update_attribute( :completed, Time.now.to_f )
        end
      end

    end
  end

else
  puts "#{__LINE__.to_s}: ScriptRun.status_update: ScriptRun not

found for run #{run_id} script #{script_id} ts #{ts.to_s}"
end

File.delete(path)

end

def run_completed?( id )
scriptruns = ScriptRun.find(:all, :conditions => [ “run_id = ?”,
id.to_i] )
scriptruns.each do |sr|
if not sr.status == ‘completed’
return false
end
end
return true
end
end

LogParser is too long even for this post but it reads the script log and
pulls detailed information (counts and timings) out of the log and
writes to a details table. It also tallies and calculates averages and
rolls those up into summary tables for quicker access from the web
pages.

Here is the error trace:
(don’t ask why everything is under my Windows profile. It’s a long
story)

Scanner running 1270239731.43
directory_watcher.notify_observers: #<ScriptStatusObserver:0x48ae838
@rcvdEvents
=[#,
#]>
update:[#,
#]
rake aborted!
can’t modify frozen hash
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/rails/activerecord/l
ib/active_record/attribute_methods.rb:313:in []=' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/rails/activerecord/l ib/active_record/attribute_methods.rb:313:inwrite_attribute_without_dirty’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/rails/activerecord/l
ib/active_record/dirty.rb:139:in write_attribute' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/rails/activerecord/l ib/active_record/attribute_methods.rb:211:inlast_error=’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:141:in handle_failed_job' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/ lib/delayed/worker.rb:115:inrun’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:162:in reserve_and_run_one_job' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/ lib/delayed/worker.rb:92:inwork_off’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:91:in times' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/ lib/delayed/worker.rb:91:inwork_off’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:66:in start' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/rails/activesupport/ lib/active_support/core_ext/benchmark.rb:10:inrealtime’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:65:in start' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/ lib/delayed/worker.rb:62:inloop’
C:/Documents and
Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/
lib/delayed/worker.rb:62:in start' C:/Documents and Settings/pneve/workspace/waftt-0.29/vendor/plugins/delayed_job/ lib/delayed/tasks.rb:13 c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:636:incall’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:636:in execute' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:631:ineach’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:631:in execute' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:597:ininvoke_with_call_chain’
c:/Documents and Settings/pneve/ruby/lib/ruby/1.8/monitor.rb:242:in
synchronize ' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:590:ininvoke_with_call_chain’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:583:in invoke' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:2051:ininvoke_task’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:2029:in top_level' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:2029:ineach’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:2029:in top_level' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:2068:instandard_exception_handling’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:2023:in top_level' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:2001:inrun’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.
rb:2068:in standard_exception_handling' c:/Documents and Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake. rb:1998:inrun’
c:/Documents and
Settings/pneve/ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:
31
c:/Documents and Settings/pneve/ruby/bin/rake:16:in `load’
c:/Documents and Settings/pneve/ruby/bin/rake:16

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