[jira] [Created] (YUNIKORN-3121) Add REST API Endpoint for Scheduling Order Visibility

["Mit Desai (Jira)" <ji...@apache.org>]

Mit Desai created YUNIKORN-3121:
-----------------------------------

             Summary: Add REST API Endpoint for Scheduling Order Visibility
                 Key: YUNIKORN-3121
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-3121
             Project: Apache YuniKorn
          Issue Type: New Feature
          Components: core - scheduler
            Reporter: Mit Desai


h3. Summary

Add a new REST API endpoint that provides real-time visibility into the evaluation order of queues and applications during YuniKorn scheduling cycles. This enhancement will significantly improve debugging capabilities by allowing operators to quickly identify which queues and applications are being processed by the scheduler and in what order.
h3. Background

When debugging YuniKorn scheduling performance issues, operators often need to understand which queues and applications are being evaluated during scheduling cycles. Currently, this information is not easily accessible, requiring operators to:
 * Guess which applications might be causing scheduling delays
 * Search through long lists of applications and queues without clear prioritization
 * Analyze complex log files to understand scheduling behavior
 * Spend significant time identifying the root cause of scheduling latency

This lack of visibility makes it challenging to quickly pinpoint applications or queues that might be monopolizing scheduler resources or causing performance bottlenecks.

Add a new REST API endpoint that exposes the current scheduling evaluation order, showing:
 # {*}Queue Evaluation Order{*}: The sequence in which queues are being processed
 # {*}Application Order per Queue{*}: The order of applications within each queue
 # {*}Real-time Data{*}: Current state reflecting the scheduler's evaluation logic
 # {*}Structured Format{*}: Easy-to-parse JSON response for both human operators and automated tools

h4. API Specification:

{*}Endpoint{*}: {{GET /ws/v1/partition/\{partitionName}/schedulingorder}}

{*}Response Format{*}:
{noformat}
[
  {
    "queueName": "root.production.high-priority",
    "applicationIDs": [
      "app-critical-workload-001",
      "app-critical-workload-002"
    ]
  },
  {
    "queueName": "root.production.default",
    "applicationIDs": [
      "app-batch-job-123",
      "app-data-processing-456"
    ]
  },
  {
    "queueName": "root.development",
    "applicationIDs": [
      "app-test-environment-789"
    ]
  }
]
{noformat}
 



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