apache/pinot

Controller's `/segments/<tableName>/metadata` does not return metadata from all segments of the table

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#7,151 opened on Jul 11, 2021

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 (7 comments) (0 reactions) (0 assignees)Java (1,234 forks)batch import
good first issue

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Description

Following Slack discussion: https://apache-pinot.slack.com/archives/C011C9JHN7R/p1625240658371100

This endpoint is supposed (see Swagger screenshot) to return the metadata of all segments. However, it appears to only return a single segment's metadata (from a "random one").

The table really has many segments, and multiple calls to this endpoint return metadata from different segments every time.

Expected image

Actual https://user-images.githubusercontent.com/22521284/125203010-c1c71480-e276-11eb-8a60-fd2e901d9983.mp4

Contributor guide

Research direction
Examine the controller code at the `/segments/{tableName}/metadata` endpoint, likely in `PinotController.java`. Trace how segment metadata is collected and identify why only one segment's metadata is returned. Check if there is a bug in the loop or data aggregation logic.
Tech stack
java
Domain
backenddatabaseapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaREST API
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60