https://bugzilla.wikimedia.org/show_bug.cgi?id=42425

--- Comment #6 from Antoine "hashar" Musso <[email protected]> ---
With Lucene, I guess we did a simple round robin load balancing. The high
latency queries were probably hitting a single overloaded search server.

I have no idea how ElasticSearch handles load balancing of requests across
search servers. It might be using a smarter load balancing algorithm.


The dashboard at http://gdash.wikimedia.org/dashboards/searchlatency/ is
defined by operations/puppet.git in files/gdash/dashboards/searchlatency/
files.

The graphs are based on the statsd metric
MediaWiki.LuceneSearchSet.newFromQuery.  It should be fairly easy to add
similar graphs if the ElasticSearch extension provides a similar wfProfileIn()
call.

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