CODEWITHSUNDEEP
elasticsearch
sosiouxme
sosiouxme

Reputation: 1256

How are ElasticSearch Autogenerated IDs allocated?

The ElasticSearch docs say "The index operation can be executed without specifying the id. In such a case, an id will be generated automatically." Is there any information about how these are generated, and specifically how they're kept unique? Are they monotone increasing in a string comparison over time? Are they allocated as per-node ranges?

Upvotes: 1

Views: 117

Answers (1)

Val
Val

Reputation: 217304

As always, the best source of information is the source code itself.

In IndexRequest.java, we can see that if no ID is provided, the one that is automatically generated is a Base64 encoded time-based UUID (source) whose implementation can be found here. They are essentially Flake IDs.

Upvotes: 3

Related Questions