CODEWITHSUNDEEP
elasticsearch
Noel Yap
Noel Yap

Reputation: 19768

How to fail ElasticSearch index operation if id already exists?

I have multiple concurrent processes (two, to be exact) that will index to the same id. Let's say index operation I0 is done first and is followed by index operation I1. There's a chance that I1 will be indexed before I0. Whichever is indexed first, I1 should take precedence during searches.

Upvotes: 1

Views: 636

Answers (2)

pickypg
pickypg

Reputation: 22332

You can supply an optional version to the update that can be associated with its version_type to guarantee that only one is used.

Supplementing the example posted in their documentation, you can do this manually like:

curl -XPUT 'localhost:9200/twitter/tweet/1?version=1&version_type=external' -d '{
    "message" : "elasticsearch now has versioning support, double cool!"
}'

For a version_type of external, you get:

only index the document if the given version is strictly higher than the version of the stored document or if there is no existing document. The given version will be used as the new version and will be stored with the new document.

It's probably worth pointing out that the internal versioning starts at 1.

Upvotes: 1

Noel Yap
Noel Yap

Reputation: 19768

According to http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-index_.html, versioning can be used for this purpose. Just be sure to set I0's version to be less than I1's version.

Upvotes: 1

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