Ok try

#!/usr/bin/perl
use strict;

my $reqid = '8274';
my $infile  = 'worker.log';
open IN,'<',$infile or die "$!";

# input
my %data = ();
my @id = ();
while (<IN>) {
  chomp;
  next unless /Task:id=(\d+)/;

  my $taskid = $1;
  my (undef,$timestamp,undef)  = split /\s+/,$_,3;
   
  if (/(Started|Submitted|Done).*(consuming|job)/){
    my $i = ($1 eq 'Done') ? 1 : 0;
    my $proc = ($2 eq 'consuming') ? $2 : 'Submitted';
    $data{$taskid}{$proc}[$i] = $timestamp;
  }

  while ( /\{(\d+)-SUCCESSFUL\}/g ){
    push @id,$1 if ($taskid eq $reqid);
  }
}
close IN;

# output
print join ',',('Task id','Start time',"End time\n");
for my $id (sort @id){
  if (exists $data{$id}){
    for my $proc (reverse sort keys %{$data{$id}}){
      printf "%s,%s,%s\n","$id $proc",@{$data{$id}{$proc}};
    }
  } else {
    print OUT "$id- no data\n";
  }
}
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