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= 實作十一 Lab 11 =

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<div style="text-align: center;"><big style="font-weight: bold;"><big>練習豬的拉丁語<br/>Pig Latin in Practice</big></big></div>
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以下練習，請連線至 hadoop.3du.me 操作。底下的 userXX 等於您的用戶名稱。
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== Aggregation (Local Mode) ==

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~$ wget http://www.hadoop.tw/excite-small.log
~$ pig -x local
grunt> log = LOAD 'excite-small.log' AS (user, timestamp, query);
grunt> grpd = GROUP log BY user;
grunt> cntd = FOREACH grpd GENERATE group, COUNT(log);
grunt> STORE cntd INTO 'lab8_out1';
grunt> quit
~$ head lab8_out1/part-*
}}}

== Filter (Local Mode) ==

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~$ pig -x local
grunt> log = LOAD 'excite-small.log' AS (user, timestamp, query);
grunt> grpd = GROUP log BY user;
grunt> cntd = FOREACH grpd GENERATE group, COUNT(log) AS cnt;
grunt> fltrd = FILTER cntd BY cnt > 50;
grunt> STORE fltrd INTO 'lab8_out2';
grunt> quit
~$ head lab8_out2/part-*
}}}

== Sorting (Local Mode) ==

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~$ pig -x local
grunt> log = LOAD 'excite-small.log' AS (user, timestamp, query);
grunt> grpd = GROUP log BY user;
grunt> cntd = FOREACH grpd GENERATE group, COUNT(log) AS cnt;
grunt> fltrd = FILTER cntd BY cnt > 50;
grunt> srtd = ORDER fltrd BY cnt;
grunt> STORE srtd INTO 'lab8_out3';
grunt> quit
~$ head lab8_out3/part-*
}}}

== Connect Pig to Hadoop (Full Distributed Mode) ==

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~$ hadoop fs -put excite-small.log .
~$ pig
grunt> log = LOAD 'excite-small.log' AS (user, timestamp, query);
grunt> grpd = GROUP log BY user;
grunt> cntd = FOREACH grpd GENERATE group, COUNT(log);
grunt> STORE cntd INTO 'lab8_out1';
grunt> quit
~$ hadoop fs -cat lab8_out1/part-00000
}}}