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Hadoopソースコードリーディング 2回目 hadoopでwikipedia解析(≒hadoopでxml解析)
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Hadoopソースコードリーディング 2回目で行いました 「HadoopでWikipedia解析(≒HadoopでXML解析)」のLTの資料をUPしました。
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Hadoopソースコードリーディング 2回目 hadoopでwikipedia解析(≒hadoopでxml解析)
1.
HadoopでWikipedia解析 (≒HadoopでXML解析)
2.
Blog : http://d.hatena.ne.jp/yamiura/ Twitter : yamiura
3.
Wikipediaのデータ(XML)
4.
圧縮ファイル 16G! XML!
5.
XMLの内容 <page> <title>GNU Free
Documentation License</title> <id>75</id> <revision> <id>135</id> <timestamp>2002-12-17T06:04:47Z</timestamp> <contributor> <username>Tomos</username> <id>10</id> </contributor> <comment>さわり/just started</comment> <text xml:space=“preserve”>[[GNU]] Free Documentation Licenseの略称。 GNU フリー文書利用許諾契約書として、・・・・・・・・・ <revision> <id>7103</id> <timestamp>2003-02-25T16:40:31Z</timestamp> <contributor> <ip>211.123.199.231</ip> </contributor>
6.
<page> <title>GNU Free
Documentation License</title> <id>75</id> <revision> 仕事中? <id>135</id> <timestamp>2002-12-17T06:04:47Z</timestamp> <contributor> <username>Tomos</username> <id>10</id> カテゴリは? </contributor> <comment>さわり/just started</comment> <text xml:space=“preserve”>[[GNU]] Free Documentation Licenseの略称。 GNU フリー文書利用許諾契約書として、・・・・・・・・・ <revision> <id>7103</id> <timestamp>2003-02-25T16:40:31Z</timestamp> <contributor> <ip>211.123.199.231</ip> </contributor> 会社からですか?
7.
あらゆる情報が つまった夢のXML!!!
8.
参考:XMLの種類の説明ページ http://www.mwsoft.jp/programming/munou/wikipedia_data_list.html
9.
ここから、本題。 HadoopでXML処理
10.
Mapへのインプットを決めるクラス デフォルトは、1行入力
11.
Jobを定義するMain文 イメージ 取り消し線、黄色線は何?
12.
非推奨(?)な旧クラス、新クラス Mapper,Reducerも同様の状態
13.
旧クラス(非推奨?)のほうが Implが多い・・・
14.
推奨されていない 旧クラスのほうが 圧倒的に豊富 新しいもの≠いいもの
15.
こんな気分でした
16.
旧クラスには、XML処理用クラス有り ただし、hadoop
streming 普通のHadoopでもクラスは使えます
17.
新クラスには、XML処理用クラス無し
orz... でも、自作は結構簡単です!!
18.
まとめ - XML処理もできる - InputFormat,RecordReaderで制御 -
トラップあり - (厳密な処理は注意) - (Wik-IEのコードを参考に)
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