[NUTCH-907] DataStore API doesn't support multiple storage areas for multiple disjoint crawls

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: nutchgora
• Assignee: Andrzej Bialecki
• Reporter: Andrzej Bialecki
• Created: 15/Sep/10 15:00
• Updated: 22/May/13 03:53
• Resolved: 21/Oct/10 12:02

Description

In Nutch 1.x it was possible to easily select a set of crawl data (crawldb, page data, linkdb, etc) by specifying a path where the data was stored. This enabled users to run several disjoint crawls with different configs, but still using the same storage medium, just under different paths.

This is not possible now because there is a 1:1 mapping between a specific DataStore instance and a set of crawl data.

In order to support this functionality the Gora API should be extended so that it can create stores (and data tables in the underlying storage) that use arbitrary prefixes to identify the particular crawl dataset. Then the Nutch API should be extended to allow passing this "crawlId" value to select one of possibly many existing crawl datasets.