MG-234: REDUCE_LOGS=compress_logs compresses large must-gather logs before rsync - #559
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Allow REDUCE_LOGS=compress_logs to gzip collected .log files larger than 10MB after gatherers finish (before rsync), with COMPRESS_LOGS_JOBS to tune parallelism. Unset REDUCE_LOGS keeps existing behavior. Co-authored-by: Cursor <cursoragent@cursor.com>
Replace the manual PID pool with find | xargs -P for clearer parallelism, and drop the unused missing-directory guard now that gather always writes to /must-gather before compression runs. Co-authored-by: Cursor <cursoragent@cursor.com>
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Included review availability: Your plan includes up to 12 reviews per rolling hour; 11 remain after this review. WalkthroughThe collection scripts add a ChangesPost-gather log compression
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change adds optional compression for large collected logs while preserving existing behavior when unused; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 15✅ Passed checks (15 passed)
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Inline comments:
In `@collection-scripts/common.sh`:
- Around line 97-98: Update the find-to-gzip pipeline in the log compression
command to use NUL-delimited output and NUL-aware xargs with no-run-on-empty
behavior, preserving pathnames containing whitespace, newlines, or quotes and
avoiding invocation when no files match. Add coverage for a matching filename
containing spaces and for an empty target directory.
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collection-scripts/common.shcollection-scripts/gathertests/common.bats
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Benchmark (MG-234
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| Metric | full must gather (without compression) | compress_logs jobs=2 |
compress_logs jobs=4 |
|---|---|---|---|
| Size | 32 GiB | 7.7 GiB | 7.7 GiB |
| Gather (collect) | 26.3 min | 25.2 min | 27.1 min |
| Compression | — | 3.7 min | 4.0 min |
| Copy (rsync) | 29.3 min | 35.2 min | 48.3 min |
| E2E (ns create → delete) | 55.6 min | 64.5 min | 79.8 min |
vs full must gather (without compression)
compress_logs jobs=2 |
compress_logs jobs=4 |
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|---|---|---|
| Size decreased | −24.3 GiB (−76%) | −24.3 GiB (−76%) |
| E2E time increased | +8.9 min (+16%) | +24.2 min (+44%) |
| Compression overhead | +3.7 min | +4.0 min |
| Copy time change | +5.9 min | +19.0 min |
Notes
- Size win is consistent (~−76%); compression itself adds only ~4 min.
- E2E was longer than full must gather (without compression) mainly due to slower rsync of already-gzipped logs (wire
speedup~1.16 vs ~5.1 on uncompressed text) plus copy-path variance — not because higherCOMPRESS_LOGS_JOBSslows the cluster. - jobs=4 did not improve compress time vs jobs=2; the jobs=4 E2E gap is mostly copy variance (~2.7 vs ~3.7 MiB/s).
| echo "Compressing collected logs in parallel (jobs=2)..." | ||
| # -print0 / xargs -0: keep path names with spaces/quotes intact | ||
| # -r: do not run gzip when find matches nothing (GNU xargs) | ||
| find "${target_dir}" \( -name '*.log' -o -name '*.log.*' \) ! -name '*.gz' -size +10M -print0 \ |
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This is too complex. Can we simplify it to have it more readable.
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Made it multi line and readable.
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/lgtm |
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/test e2e-aws |
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/verified by @shivprakashmuley |
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/cherry-pick release-5.0 |
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@shivprakashmuley: new pull request created: #561 DetailsIn response to this:
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Summary
REDUCE_LOGS=compress_logsto gzip collected.log/.log.*files larger than 10MB after gather finishes and beforeocrsyncs/must-gather.COMPRESS_LOGS_JOBS.REDUCE_LOGSvalues keep existing behavior;compress_logscombines withskip_rotated_logsandcompress_service_logs.Usage
Test plan
./tmp/bin/bats tests/common.batsREDUCE_LOGSunchangedREDUCE_LOGS=compress_logs: large logs become.gz, small logs untouchedskip_rotated_logs,compress_service_logs,compress_logs) workREDUCE_LOGSvalue still errorsSummary by CodeRabbit
.logand.log.*files larger than 10 MB.