June 2017
Beginner to intermediate
404 pages
8h 22m
English
Content preview from Learning Elasticsearch
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Caching
When you execute an aggregation query, the node that receives the request sends the query to all the shards of the index. The results from each shard are gathered back and sent to the client. The aggregation results are cached at a shard level. Computing an aggregation is an expensive operation. Caching the response greatly improves the performance and reduces the strain on the system. Elasticsearch cache is smart and is automatically invalidated where there is new data. Since the cache is per shard, the cache is invalidated only for the shards that have new/modified data. Starting Elasticsearch 5.0, the request cache is enabled by default. The query JSON is used as a key.
Cache greatly improves performance for indexes that have static ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.