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Both sides previous revision Previous revision 2012/01/31 09:38 straka Change Perl commandline syntax.2012/01/27 17:48 straka 2012/01/27 17:45 straka 2012/01/26 22:40 straka 2012/01/26 17:08 straka 2012/01/25 22:05 straka 2012/01/25 14:33 straka 2012/01/25 14:32 straka 2012/01/23 21:34 straka 2012/01/23 21:33 straka 2012/01/23 21:33 straka 2012/01/23 21:33 straka 2012/01/23 21:29 straka 2012/01/23 21:28 straka 2012/01/23 21:20 straka 2012/01/23 21:18 straka 2012/01/23 21:16 straka 2012/01/23 21:07 straka vytvořeno Go Next revision		Previous revision 2012/01/31 09:38 straka Change Perl commandline syntax.2012/01/27 17:48 straka 2012/01/27 17:45 straka 2012/01/26 22:40 straka 2012/01/26 17:08 straka 2012/01/25 22:05 straka 2012/01/25 14:33 straka 2012/01/25 14:32 straka 2012/01/23 21:34 straka 2012/01/23 21:33 straka 2012/01/23 21:33 straka 2012/01/23 21:33 straka 2012/01/23 21:29 straka 2012/01/23 21:28 straka 2012/01/23 21:20 straka 2012/01/23 21:18 straka 2012/01/23 21:16 straka 2012/01/23 21:07 straka vytvořeno Go
courses:mapreduce-tutorial:perl-api [2012/01/27 17:45] straka		courses:mapreduce-tutorial:perl-api [2012/01/31 09:38] (current) straka Change Perl commandline syntax.
Line 33:		Line 33:
	==== Command line arguments supported by Hadoop::Runner::run() ====		==== Command line arguments supported by Hadoop::Runner::run() ====
-	script.pl run [-jt/--jobtracker jobtracker | -c/--cluster machines [-w/--wait secs]] [-r/--reducers reducers] [generic Hadoop options] input_path output_path	+	script.pl [-jt jobtracker | -c number_of_machines [-w secs]] [-r reducers] [-Dname=value -Dname=value ...] input output
-	script.pl map number_of_reducers	+	script.pl --map number_of_reducers
-	script.pl reduce	+	script.pl --reduce
-	script.pl combine	+	script.pl --combine
	===== Hadoop::Mapper =====		===== Hadoop::Mapper =====
Line 69:		Line 69:
	* ''$values%%->%%value()'' -- returns the current value, undef if there is any.		* ''$values%%->%%value()'' -- returns the current value, undef if there is any.
	* ''$values%%->%%next()'' -- advance to next value. Returns true if there is any, false otherwise.		* ''$values%%->%%next()'' -- advance to next value. Returns true if there is any, false otherwise.
-	* At the beginning there is no current value, the first value should be obtained by calling 'next'.	+	* At the beginning there is no current value, the first value should be obtained by calling ''next''.
	* ''sub reduce($self, $key, $values, $context)'' -- the variable ''$content'' has following methods:		* ''sub reduce($self, $key, $values, $context)'' -- the variable ''$content'' has following methods:
	* ''$content%%->%%write($key, $value)'' -- output the (''$key'', ''$value'') pair		* ''$content%%->%%write($key, $value)'' -- output the (''$key'', ''$value'') pair

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