Fix Elasticsearch BadRequest exception

Merged Dmitry Gruzd requested to merge fix-elastic-transport-error into master

What does this MR do?

This is a fix for a change behind a feature flag elasticsearch_use_routing. Introduced in !22261 (merged)

While working on #196569 (comment 281186673) we met an unexpected exception

[400] {"error":{"root_cause":[{"type":"too_long_frame_exception","reason":"An HTTP line is larger than 4096 bytes."}],"type":"too_long_frame_exception","reason":"An HTTP line is larger than 4096 bytes."},"status":400}

I'm still waiting for rails c access on staging, so my guess is that we push too many project_ids to routing and http URI becomes too long resulting in the ES transport exception.


This MR sets a limit to prevent this kind of errors.

Calculation of a new limit

The worst possible case:

  • each project_id is 10 digit long (close to the max 4-byte integer size >= 2,000,000,000)

That way we have 19 bytes per project_id ("project_2147483647,".length => 19)

We want to make room for schema, login-password, path. Let's say we over reserve 512 bytes, we have 4096-512=3584 bytes left.

3584/19 = 188 project_ids. Let's round it to the closest power of 2 - 128.


Does this MR meet the acceptance criteria?


Availability and Testing


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