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Ready to Push - Comprehensive Diagnostics

Current Status

Branch: java-client-replication-configuration
Commits ahead of origin: 1 (revert of documentation file)
All diagnostic code is already in place from previous pushes

What This Push Contains

Commit: `afce69db1`

Revert "docs: comprehensive analysis of persistent 78-byte Parquet issue"

Removes the PARQUET_ISSUE_SUMMARY.md documentation file (cleanup).

What's Already Pushed and Active

The following diagnostic features are already in origin and will run on next CI trigger:

1. Enhanced Write Logging (Commits: `48a2ddf`, `885354b`, `65c3ead`)

Tracks every write with totalBytesWritten counter
Logs footer-related writes (marked [FOOTER?])
Shows write call count for pattern analysis

2. Parquet 1.16.0 Upgrade (Commit: `12504dc1a`)

Upgraded from 1.13.1 to 1.16.0
All Parquet dependencies coordinated
Result: Changed file sizes but error persists

3. File Download & Inspection (Commit: `b767825ba`) ⭐

- name: Download and examine Parquet files
  if: failure()
  working-directory: test/java/spark
  run: |
    # Install parquet-tools
    pip3 install parquet-tools
    
    # Download failing Parquet file
    curl -o test.parquet "http://localhost:8888/test-spark/employees/..."
    
    # Check magic bytes (PAR1)
    # Hex dump header and footer  
    # Run parquet-tools inspect/show
    # Upload as artifact

This will definitively show if the file is valid!

What Will Happen After Push

GitHub Actions triggers automatically
All diagnostics run (already in place)
Test fails (expected - 78-byte error persists)
File download step executes (on failure)
Detailed file analysis printed to logs:
- File size (should be 693 or 705 bytes)
- PAR1 magic bytes check (header + trailer)
- Hex dump of footer (last 200 bytes)
- parquet-tools inspection output
Artifact uploaded: failed-parquet-file (test.parquet)

Expected Output from File Analysis

If File is Valid:

✓ PAR1 magic at start
✓ PAR1 magic at end
✓ Size: 693 bytes
parquet-tools inspect: [metadata displayed]
parquet-tools show: [can or cannot read data]

If File is Incomplete:

✓ PAR1 magic at start
✗ No PAR1 magic at end
✓ Size: 693 bytes
Footer appears truncated

Key Questions This Will Answer

Is the file structurally complete?
- Has PAR1 header? ✓ or ✗
- Has PAR1 trailer? ✓ or ✗
Can standard Parquet tools read it?
- If YES: Spark/SeaweedFS integration issue
- If NO with same error: Footer metadata wrong
- If NO with different error: New clue
What does the footer actually contain?
- Hex dump will show raw footer bytes
- Can manually decode to see column offsets
Where should we focus next?
- File format (if incomplete)
- Parquet writer bug (if wrong metadata)
- SeaweedFS read path (if file is valid)
- Spark integration (if tools can read it)

Artifacts Available After Run

Test results: spark-test-results (surefire reports)
Parquet file: failed-parquet-file (test.parquet)
- Download and analyze locally
- Use parquet-tools, pyarrow, or hex editor

Commands to Push

# Simple push (recommended)
git push origin java-client-replication-configuration

# Or with verbose output
git push -v origin java-client-replication-configuration

# To force push (NOT NEEDED - history is clean)
# git push --force origin java-client-replication-configuration

After CI Completes

Check Actions tab for workflow run
Look for "Download and examine Parquet files" step
Read the output to see file analysis
Download failed-parquet-file artifact for local inspection
Based on results, proceed with:
- Option A: Fix Parquet footer generation
- Option B: Try uncompressed Parquet
- Option C: Investigate SeaweedFS read path
- Option D: Update Spark/Parquet version

Current Understanding

From logs, we know:

✅ All 693 bytes are written
✅ Footer trailer is written (last 6 bytes)
✅ Buffer is fully flushed
✅ File metadata shows 693 bytes
❌ Parquet reader expects 771 bytes (693 + 78)
❌ Consistent 78-byte discrepancy across all files

Next step after download: See if the 78 bytes are actually missing, or if footer just claims they should exist.

Timeline

Push now → ~2 minutes
CI starts → ~30 seconds
Build & test → ~5-10 minutes
Test fails → File download executes
Results available → ~15 minutes total

4.5 KiB Raw Blame History