CFG

Config audit

Spark properties that leave the cluster uncapped or the serializer slow.

Outcome: Setup
Scope: Judged on the Spark configuration
Usual fix: A Spark configuration change
CI gate: No budget flag: gate it with --fail-on-introduced against a baseline

An example finding

Where you see it

Dashboard

The CFG tag marks it in the action region of the dashboard, among the widgets that rank a fix. How to read it in the findings guide.

Agent (MCP)

An assistant can read this entry with the list_detectors tool and its background with get_finding_documentation. The call and the response below come from a real run of the MCP server.

Call

{
  "tool": "list_detectors",
  "arguments": {
    "type": "configAudit"
  }
}

Response

{
  "count": 1,
  "detectors": [
    {
      "type": "configAudit",
      "name": "config audit",
      "tag": "CFG",
      "tagSharedWith": [],
      "family": "setup",
      "pitch": "Spark properties that leave the cluster uncapped or the serializer slow.",
      "region": "action",
      "scope": "config",
      "fixEffort": "config",
      "thresholdSummary": "a Spark conf value outside the recommended range",
      "detectors": [
        {
          "detector": "configAudit",
          "version": 1,
          "thresholds": {}
        },
        {
          "detector": "configAudit",
          "version": 1,
          "thresholds": {}
        },
        {
          "detector": "configAudit",
          "version": 1,
          "thresholds": {
            "floorMB": 384,
            "floorPct": 0.1
          }
        }
      ],
      "pages": {
        "catalog": "docs/detectors/configAudit.html",
        "guide": "docs/user-guide/understanding-findings.html#cfg"
      },
      "tuning": null,
      "gate": null
    }
  ]
}

get_finding_documentation call

{
  "tool": "get_finding_documentation",
  "arguments": {
    "type": "configAudit"
  }
}

Its response, with each Markdown body replaced by its length

{
  "type": "configAudit",
  "name": "Config Audit",
  "detectionDoc": {
    "tag": "CFG",
    "title": "Configuration audit",
    "content": "<1375 characters of Markdown>"
  },
  "tuningDoc": null
}

CI (CLI)

List this entry from the command line. The output below is a real run of the command. Budgets and exit codes are in the CI guide.

sparkforensics-analyze detectors --type configAudit --format md

# Detectors (1)

## Setup

| Tag | Type | Scope | Fix | Gate | What it finds |
| --- | --- | --- | --- | --- | --- |
| CFG | `configAudit` | config | config |  | Spark properties that leave the cluster uncapped or the serializer slow. |

Report only this finding type for a run with --type:

sparkforensics-analyze <event-log> --type configAudit --impact critical,warning,info

It has no budget flag. Fail a build on a new one by comparing against a baseline with --fail-on-introduced.

Airflow

The operator has no budget parameter for it. Use fail_on_introduced with a baseline.

check_spark_job = SparkForensicsOperator(
    task_id="check_spark_job",
    log_source=...,
    backend=SubprocessAnalyzeHook(),
    baseline_log_source=...,
    fail_on_introduced="critical",
)

The operator works per run, and its summary counts findings per impact band. See the operator for its parameters.

How it is measured

Thresholds

A Spark conf value outside the recommended range.

configAudit version 1, check 1 of 3

Threshold	Default
No thresholds.

configAudit version 1, check 2 of 3

Threshold	Default
No thresholds.

configAudit version 1, check 3 of 3

Threshold	Default
`floorMB`	384
`floorPct`	0.1

Each rule's impact bands and fixed fallbacks are in the threshold tables.

Override a default per run with --thresholds; see Tuning detector thresholds.

Docs

There is no tuning page for this type.
Findings guide: CFG in Understanding findings.