Nutch 研究與隨筆

前言

• 目前開發NutchEz 已經可以運作了，但都是基本功能，也找出某些問題
• 希望在完整的看完Nutch的官方網頁後，得到更好的靈感與改進方式

更多指令

readdb

$ nutch readdb /tmp/search/crawldb -stats

09/06/09 12:18:13 INFO mapred.MapTask: data buffer = 79691776/99614720

09/06/09 12:18:13 INFO mapred.MapTask: record buffer = 262144/327680

09/06/09 12:18:14 INFO crawl.CrawlDbReader: TOTAL urls:	1072
09/06/09 12:18:14 INFO crawl.CrawlDbReader: status 1 (db_unfetched):	1002

09/06/09 12:18:14 INFO crawl.CrawlDbReader: status 2 (db_fetched):	68

convdb

• 沒啥用

inject

readlinkdb

readseg

• read / dump segment data
• Usage: SegmentReader? (-dump ... | -list ... | -get ...) [general options]
• SegmentReader? -dump <segment_dir> <output> [general options]
• SegmentReader? -list (<segment_dir1> ... | -dir <segments>) [general options]
• SegmentReader? -get <segment_dir> <keyValue> [general options]

updatedb

• update crawl db from segments after fetching
• Usage: CrawlDb? <crawldb> (-dir <segments> | <seg1> <seg2> ...) [-force] [-normalize] [-filter] [-noAdditions]

  $ nutch updatedb /tmp/search/crawldb/ -dir /tmp/search/segments/
  

dedup

• remove duplicates from a set of segment indexes
• Usage: DeleteDuplicates? <indexes> ...

  $ nutch dedup /tmp/search/indexes/
  
  

筆記