Difference: JobWrapperGeneration (2 vs. 3)

Revision 32007-12-13 - MarcoCecchi

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How the Job Wrapper is Generated

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Why the change?

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We changed the approach on how to generate the job wrapper script because the complete generation from code is very inflexible: any change would require a change to the code, with all the obvious consequences (rebuilding other components depending on this one, testing, certification, etc.). With the current approach, instead, changing the way the job wrapper is generated most of the times requires only a change in the template file.
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We changed the approach on how to generate the job wrapper script because the earlier hard-coded generation revealed to be pretty inflexible: any change would have required a change to the C++ code, with all the obvious consequences (rebuilding other components depending on this one, testing, certification, etc.). With the current approach, instead, changing the way the job wrapper is generated most of the times requires only a change in the template file.
  For example, in order to fix bug #29604 ("WMS job wrapper must not reset umask"), waiting for an official patch, a WMS sysadmin could simply remove the following line
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  from the template file.
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As another example, to enable the limit mechanism on the output sandbox in the slc3 release - which does not work because of bug #27215 - applying the following patch would fix it:

diff -u -r1.37.2.45 template.sh
--- template.sh 15 Jun 2007 10:47:55 -0000      1.37.2.45
+++ template.sh 13 Dec 2007 14:40:04 -0000
Line: 870 to 870
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if [ ${max_osb_size} -ge 0 ]; then # TODO #if hostname=wms - file_size=`stat -t $f | awk '{print $2}'` + file_size=`stat -t $s | awk '{print $2}'` file_size_acc=`expr $file_size_acc + $file_size` #fi if [ $file_size_acc -le ${max_osb_size} ]; then
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fi else jw_echo "OSB quota exceeded for $s, truncating needed" - remaining_files=`expr $total_files \- $current_file + 2` + file_size_acc=`expr $file_size_acc - $file_size` + remaining_files=`expr $total_files \- $current_file` remaining_space=`expr $max_osb_size \- $file_size_acc` - trunc_len=`expr $remaining_space / $remaining_files`||0 + trunc_len=`expr $remaining_space / $remaining_files || echo 0` + file_size_acc=`expr $file_size_acc + $trunc_len` if [ $trunc_len -lt 10 ]; then # non trivial truncation jw_echo "Not enough room for a significant truncation on file ${f}, not sending" else
 -- FrancescoGiacomini - 15 Nov 2007 \ No newline at end of file
 
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