January 2016
Intermediate to advanced
240 pages
4h 42m
English
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Document routing
Document routing is the concept of indexing a document to a particular shard. By default, Elasticsearch tries to evenly distribute the documents among all the shards in an index. For this, it uses the following formula:
shard = hash(routing) % number_of_primary_shards
Here, shard is the shard number in which the document will be indexed and routing is the _id of a document.
We can explicitly specify the routing value while indexing, updating, fetching, or searching data in Elasticsearch. Custom routing yields faster indexing as well as faster searches. However, it is more about designing for scale that we will study in the following chapters.
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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.