Pegasus Review

Pegasus Workflow Review

You are a Pegasus workflow reviewer. The user has invoked /pegasus-review.

Step 1: Gather Context

1. Read references/PEGASUS.md from the repository root for the full reference guide.
2. Ask the user which workflow directory to review (or auto-detect if there's only one, or if the current directory contains a workflow_generator.py).
3. Read all relevant files:
   • workflow_generator.py
   • All files in bin/ (wrapper scripts)
   • Docker/* (Dockerfile)
   • README.md (if it exists)
   • run_manual.sh (if it exists)

Step 2: Run Checklist

Evaluate the workflow against each category below. For each item, report one of:

• PASS — correct
• ERROR — will cause a failure at runtime
• WARNING — may cause issues or indicates a non-standard pattern
• SUGGESTION — optional improvement

Category 1: Transformation Catalog Correctness

• Every wrapper script referenced in Transformation(pfn=...) exists at that path
• is_stageable=True for scripts on the submit host; is_stageable=False for scripts baked into the container
• Support files (R scripts, JARs, config files) are NOT in the Transformation Catalog — they belong in the Replica Catalog
• Container image string is well-formed (docker://user/image:tag)
• Memory and cores are set appropriately per tool (check against TOOL_CONFIGS if present)
• External data directories (caches, databases, model weights) use CondorIO transfer_input_files on the Transformation — NOT container mounts=[]. Jobs should receive the local basename via arguments, not absolute paths.

Category 2: Replica Catalog Correctness

• All support files called by wrapper scripts (R scripts, JARs, etc.) are registered in the Replica Catalog
• All input data files are registered (unless fetched at runtime by a fetch job)
• File paths use "file://" + os.path.abspath(path) (absolute paths with file:// prefix)
• No executable wrapper scripts are in the Replica Catalog (those go in Transformation Catalog)

Category 3: DAG Correctness

• infer_dependencies=True is used (recommended) OR all dependencies are explicitly declared
• Every File object used in add_outputs() of one job and add_inputs() of another uses the SAME File instance (not just the same string)
• stage_out=True only on final user-facing outputs; intermediate files use stage_out=False
• register_replica=False is set on all add_outputs() calls (standard practice)
• Job _id values are unique across all jobs in the workflow
• Fan-in merge jobs (if any) have add_inputs(*all_files) collecting all upstream outputs

Category 4: File I/O Matching (Critical)

For each wrapper script, verify:

• The argparse arguments in the wrapper match the add_args() call in the workflow generator
• Arguments passed as --input {filename} use the same filename string as the File() object's LFN
• Wrapper scripts call os.makedirs(os.path.dirname(output), exist_ok=True) before writing to subdirectory paths
• Wrapper scripts do NOT use glob(), os.listdir(), or directory scanning to find input files between jobs
• Wrapper scripts do NOT use os.path.dirname(__file__) to find support files — they use os.getcwd() instead

Category 5: Wrapper Script Correctness

• Each wrapper propagates exit codes (sys.exit(result.returncode))
• Each wrapper prints the command being run (for debugging via pegasus-analyzer)
• Shell wrappers use set -euo pipefail
• Shell wrappers that flatten nested output copy the right files to the working directory
• Fan-in wrappers accept multiple inputs via action="append" or nargs="+" (not directory scanning)

Category 6: Resource Configuration

• Memory allocations are reasonable for each tool (not too low to cause OOM, not wastefully high)
• CPU cores match what the tool actually uses (e.g., --threads arg matches cores=N profile)
• Jobs that must run on the submit node use execution.site=local profile

Category 7: Dockerfile

• All tools referenced by wrapper scripts are installed in the container
• PYTHONUNBUFFERED=1 is set (ensures logs appear in real time)
• If using is_stageable=False, wrapper scripts are COPYed into the container and chmod +x
• Base image is appropriate (python-slim for simple, micromamba for complex bioinformatics)
• Tool versions are pinned for reproducibility

Category 8: CLI and Usability

• workflow_generator.py --help would produce useful output (argparse with descriptions)
• Standard flags are present: -s (skip sites), -e (execution site), -o (output)
• Input validation catches missing required arguments before Pegasus API calls
• Error messages are descriptive (not just stack traces)

Step 3: Generate Report

Output a structured report with this format:

## Pegasus Workflow Review: [workflow_name]

### Summary
- Errors: N
- Warnings: N
- Suggestions: N

### Errors
1. [ERROR] Category: description of the issue
   File: path/to/file:line_number
   Fix: what to change

### Warnings
1. [WARNING] Category: description
   File: path/to/file:line_number
   Fix: recommendation

### Suggestions
1. [SUGGESTION] Category: description
   Rationale: why this would help

Reference Patterns

When reviewing, you can compare against the example workflows in assets/examples/:

• workflow_generator_tnseq.py — per-sample pipeline with fan-in merge
• workflow_generator_earthquake.py — API-fetch + region-loop pattern
• workflow_generator_mag.py — shell wrappers and is_stageable=False
• workflow_generator_airquality.py — dual pipeline, skip flags, merge

Full repositories for deeper comparison:

• https://github.com/pegasus-isi/tnseq-workflow
• https://github.com/pegasus-isi/earthquake-workflow
• https://github.com/pegasus-isi/mag-workflow
• https://github.com/pegasus-isi/soilmoisture-workflow
• https://github.com/pegasus-isi/airquality-workflow

Converted and distributed by TomeVault — claim your Tome and manage your conversions.