Add columns CAT Shards for _tier_preference and node.roles · elastic/elasticsearch#136895

(8 留言) (0 反應) (0 負責人)Java (76,700 star) (25,882 fork)batch import

:Core/Infra/CAT APIs>enhancementTeam:Core/Infragood first issue

描述

Description

👋 howdy!

Hopefully this avoids the XPack-vs-commercial issues surfaced in https://github.com/elastic/elasticsearch/issues/37499. (XY Problem:) I'd like to streamline investigating assigned shard allocation issues related to ILM. As part of flow after https://github.com/elastic/elasticsearch/pull/99612 or Health Report telling you indices are flagged stagnant on migrations.

As part of this, I'd like if CAT Shards would report columns

the shard's index's index.routing.allocation.include._tier_preference setting used by ILM
the shard's node's roles in short form

In practice, I usually flag via an aggregated view and then review a table of what'd be the above similar output. For example when cold backs up warm backs up hot:

TIA!

貢獻者指南

技術棧: java
領域: backendapi
議題類型: feature
難度: 3
預計時間: 1-3 hours
活動狀態: fresh
清晰度: mostly clear
前置要求: Familiarity with Elasticsearch CAT APIBasic knowledge of Java and Elasticsearch codebase
新手友善度: 60
研究方向: The issue requests adding two columns (tier preference and node.roles) to the CAT shards API response. Look at the CAT shards action implementation, likely in the 'cat' module. The response format is defined in a class like RestCatShardsAction or similar. Adding columns requires updating the response builder and possibly the parsing logic. Check existing columns for reference. There is a linked issue #37499 for context on XPack vs commercial nuances. No open PRs; this is a good first task for understanding CAT API internals.