Google’s move away from federated search is particularly intriguing given that Udi Manber, former CEO of A9, is now at Google and leading Google’s search team. A9, started and built by Udi with substantial funding from Amazon.com, was a federated web search engine. It supported queries out to multiple search engines using the OpenSearch API format they invented and promoted. A9 had not yet solved the hard problems with federated search — they made no effort to route queries to the most relevant data sources or do any sophisticated merging of results — but A9 was a real attempt to do large scale federated web search.

is opensearch in trouble?

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