Help:CirrusSearch elasticsearch replicas: Difference between revisions
Revision as of 12:38, 17 May 2019
Cloud Elastic is a replica of the CirrusSearch elasticsearch indices made available to WMF cloud applications. Applications can use the full power of the elasticsearch search API's to query the search indices in ways that CirrusSearch doesn't expose directly on the wiki's themselves.
There are actually three clusters, named chi, psi and omega. chi contains approximately the 200 largest wikis. psi and omega contain equal splits of the remaining smaller wikis.
Clusters can be accessed through each other using the elasticsearch cross cluster search
syntax. For example labswiki, which lives on the omega cluster, can be queried through the chi cluster with:
All wikis have two indices, of the format <dbname>_content and <dbname>_general. The content index contains all of the content namespaces of the wiki, the general index contains everything else. So for example on wikipedia's articles are found in the content index, and talk pages are found in the general index. Querying both indices can be done by providing only the wiki db name.
This page was last edited on 17 May 2019, at 12:38.