opensearch-project/OpenSearch

Skip metadata upload if no new segment files to upload during refresh for remote store clusters

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#17,530 opened on Mar 6, 2025

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 (10 comments) (0 reactions) (1 assignee)Java (1,505 forks)batch import
Storage:Remoteenhancementgood first issue

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Description

Is your feature request related to a problem? Please describe

In the refresh flow of remote store indexes, we determine the files to be uploaded, upload them and then upload the associated metadata. This, however, uploads the metadata even when there is no new files to upload. This can be optimised and metadata upload can be skipped for such cases.

https://github.com/opensearch-project/OpenSearch/blob/3966ed93beb2ff13854d2a6e1ff51dfa32295830/server/src/main/java/org/opensearch/index/shard/RemoteStoreRefreshListener.java#L266C21-L292

Describe the solution you'd like

Optimise the segments upload flow to skip metadata upload when there are no newer segment files.

Related component

No response

Describe alternatives you've considered

No response

Additional context

No response

Contributor guide

Research direction
Examine the upload flow in RemoteStoreRefreshListener and add a check to skip metadata upload when there are no new segment files.
Tech stack
java
Domain
backend
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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
GitJava
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75