Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
courses:mapreduce-tutorial:step-3 [2012/01/30 00:37] straka Improving package names of Perl programs. |
courses:mapreduce-tutorial:step-3 [2012/01/31 09:40] (current) straka Change Perl commandline syntax. |
||
|---|---|---|---|
| Line 33: | Line 33: | ||
| Resulting script can be executed locally in a single thread using | Resulting script can be executed locally in a single thread using | ||
| - | perl script.pl | + | perl script.pl |
| - | All files in input_directory | + | Input can be either file or a directory -- in that case, all files in this directory |
| + | === Standard input and output === | ||
| + | Standard input and standard output of the Perl script are used to communicate with the Hadoop framework. Therefore you should use standard error output if you want to print some debugging output using '' | ||
| ===== Exercise ===== | ===== Exercise ===== | ||
| Line 43: | Line 45: | ||
| # NOW EDIT THE FILE | # NOW EDIT THE FILE | ||
| # $EDITOR step-3-exercise.pl | # $EDITOR step-3-exercise.pl | ||
| - | rm -rf step-3-out-ex; | + | rm -rf step-3-out-ex; |
| less step-3-out-ex/ | less step-3-out-ex/ | ||
| | | ||
| Line 51: | Line 53: | ||
| # NOW VIEW THE FILE | # NOW VIEW THE FILE | ||
| # $EDITOR step-3-solution.pl | # $EDITOR step-3-solution.pl | ||
| - | rm -rf step-3-out-sol; | + | rm -rf step-3-out-sol; |
| less step-3-out-sol/ | less step-3-out-sol/ | ||