Changeover only happens if vital servers exist in the new crawl.

Key: vital_servers
Type: List<String>
Can be set in: collection.cfg


This option defines any number of servers which must exist in a web crawl for the update to successfully complete. The option is a comma-separated list of server names that are checked during the swap views phase of the update to ensure content from this server has been crawled.

In practice, each listed server is checked against the servers.log file produced by the web crawler to ensure the vital server occurs in that file. If any servers are missing the swap does not take place and the update fails.

No protocol (e.g. http or https) should be specified in the server name(s).

Default Value



Specify key sites:,