opensearch-project/OpenSearch

[Feature Request] Migrate gRPC transport executor to ForkJoinPool for improved performance

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#19370 opened on Sep 22, 2025

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 (2 comments) (0 reactions) (2 assignees)Java (8,123 stars) (1,505 forks)batch import
Search:Performanceenhancementgood first issue

Description

Is your feature request related to a problem? Please describe

The gRPC transport currently uses a FixedExecutorBuilder for processing gRPC service calls. While this provides significant improvements over the previous directExecutor() approach, ForkJoinPool would offer even greater performance benefits, such as better load balancing through built-in mechanisms like work-stealing.

Describe the solution you'd like

Once PR #19008 to add ForkJoinPool support is merged, the gRPC transport should migrate from using FixedExecutorBuilder to ForkJoinPoolExecutorBuilder.

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response

Contributor guide

Tech stack
java
Domain
performancesearch
Issue type
feature
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Java concurrency knowledgegRPC basicsFamiliarity with OpenSearch codebase
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue depends on PR #19008 (adding ForkJoinPool support) which must be merged first. After that, the changes involve modifying the gRPC transport configuration in files such as opensearch/src/main/java/org/opensearch/transport/grpc/. The migration from FixedExecutorBuilder to ForkJoinPoolExecutorBuilder should be done as described. There are two assignees, indicating active work or intent. Check comments for additional context.