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Friday, September 15 • 11:20am - 12:00pm
Optimize Is (Not) Bad For You - Deep Dive Into The Segment Merge Abyss
They say optimize is bad for you, they say you shouldn't do it, they say it will invalidate operating system caches and make your system suffer. This is all true, but is it true in all cases? In this talk we will look closer on what optimize or better called force merge does to your Solr search engine. You will learn what segments are, how they are built and how they are used by Lucene and Solr for searching. We will discuss real-life performance implications regarding Solr collections that have many segments on a single node and compare that to the Solr where the number of segments is moderate and low. We will see what we can do to tune the merging process to trade off indexing performance for better query performance and what pitfalls are there waiting for us. Finally, at the end of the talk we will discuss possibilities of running force merge to avoid system disruption and still benefit from query performance boost that single segment index provides.

avatar for Rafał Kuć

Rafał Kuć

Engineer, Sematext Group, Inc
Rafał Kuć is a search consultant, trainer and software engineer at Sematext Group, Inc. mainly focused on Lucene, Solr, Elasticsearch and all tools around in the ecosystem. Rafał is the author of the Apache Solr Cookbook series and Elasticsearch Server. He is a father, a consu... Read More →

Friday September 15, 2017 11:20am - 12:00pm
South Seas B