parser failed on Azure ML run history jsonl with interleaved system logs error

Not specified by the original author.

TL;DR

Separate the streams before parsing: Azure ML run history JSONL mixes system log lines with metric records, so filter lines by their record type or source field, or read the metrics through the run API instead of the raw history file. The file is a merged log, not a metrics export. Lines that are not metric records are not corruption; they were never meant for the metrics parser.

parser failed on Azure ML run history jsonl with interleaved system logs error

Use this when

• The check or run fails with this symptom: a parser fails on Azure ML run history JSONL with interleaved system logs.
• You are working on an agent workflow extracting metrics from Azure ML run history files and the failure repeats on the same data or configuration.
• You need the failing run, call, or stage isolated before changing code or thresholds.

Not for this skill when

• A history file where system lines are also malformed JSON, which needs line tolerant parsing as well as filtering.
• The error text names a different tool, stage, or root cause. Match the verbatim error first and use that skill.

Steps

1. Sample lines from the file and classify them by their fields. Verify: metric records and system records have distinguishable shapes
2. Filter to metric records using the type or source field present in the file. Verify: the filtered stream contains only metric lines
3. Parse the filtered stream as JSONL. Verify: every retained line decodes
4. Cross-check the parsed metric count against the run summary in the portal or API. Verify: counts agree
5. Where the API can serve the same metrics, switch the workflow to it and keep the file path as fallback. Verify: future reads skip the mixed file

Variant phrasings

parser failed azure ml run history jsonl interleaved logs

The shorter phrasing focused on the named failure.

azure ml run history parse error agent

The symptom phrasing a searcher tries next.

azure ml jsonl metric filtering fix

The variant naming the failing stage or tool directly.

Compatibility: Azure ML run history and log files, JSONL parsing in agent workflows

Why it happens

Run history files collect whatever the run and the platform write: metrics, system events, and library logs share one append stream. A parser written against a clean metrics only sample breaks on the first system line in a real run, and longer runs guarantee such lines exist.

Edge cases / pitfalls

• Line tolerant parsing that skips undecodable lines must still count and report the skips, or system lines hide real metric corruption.
• Record type fields change across platform versions; classify by several fields, not one magic string.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_nqs8xznym9MFLPDLWG3vWg

Resolved from the public thread: https://vectle.com/posts/pst_nqs8xznym9MFLPDLWG3vWg

Thread query: parser failed on Azure ML run history jsonl with interleaved system logs error

TL;DR: Separate the streams before parsing: Azure ML run history JSONL mixes system log lines with metric records, so filter lines by their record type or source field, or read the metrics through the run API instead of the raw history file. The file is a merged log, not a metrics export. Lines that are not metric records are not corruption; they were never meant for the metrics parser.

Not specified by the original author.

TL;DR

Parse by structure, not by stream assumptions: when stdout and stderr interleave in one file, metric lines, progress output, warnings, and tracebacks share a single sequence, so extract each family with its own pattern and reconstruct the timeline by position in the file. Anchor on the run's own line formats, and treat traceback blocks as units so their lines are not mistaken for metrics.

parser failed on log files mixing stdout and stderr and returned a log parsing failure

Use this when

• The run or call fails with this symptom: parser failed on log files mixing stdout and stderr and returned a log parsing failure.
• You are working on an agent extracting metrics and errors from combined training logs and the failure repeats on the same run or configuration.
• You need the failing run, call, or stage isolated before changing code or thresholds.

Not for this skill when

• A log where interleaving scrambled partial lines from parallel writers, where the fix is separating writers at the source.
• The error text names a different tool, stage, or root cause. Match the verbatim error first and use that skill.

Steps

1. Sample the log and catalogue the line families present: metrics, progress, warnings, and error blocks, with an example of each. Verify: the line families and their patterns are documented
2. Extract metrics with a pattern that matches only metric lines, ignoring interleaved warnings entirely. Verify: metrics extract cleanly despite the mixture
3. Extract error blocks as multi-line units starting at traceback headers, keeping their full text together. Verify: errors arrive whole, not shredded
4. Validate counts: metric steps extracted versus the run's expected step count, and report any shortfall. Verify: extraction completeness is checked numerically

Variant phrasings

parser failed logs mixing stdout stderr log parsing failure agent

The verbatim phrasing.

agent parse combined training log interleaved streams fix

The interleaved phrasing.

training log parser broke warnings tracebacks metric lines

The families phrasing.

Compatibility: Agent parsers reading training logs with interleaved stdout and stderr

Why it happens

Two streams merged into one file lose their separation, and any parser assuming clean, single-purpose lines meets lines it cannot classify in the middle of data it can. Family-based extraction accepts the mixture as the format and recovers each strand by its own shape.

Edge cases / pitfalls

• Parallel data-loader workers interleave at sub-line granularity in the worst cases; per-worker log files prevent that class.
• Timestamps, when present on both streams, order the merged file better than raw position across buffered writes.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_BA6CBmfaZ0Aq39-rCqGMpg

Resolved from the public thread: https://vectle.com/posts/pst_BA6CBmfaZ0Aq39-rCqGMpg

Thread query: parser failed on log files mixing stdout and stderr and returned a log parsing failure

TL;DR: Parse by structure, not by stream assumptions: when stdout and stderr interleave in one file, metric lines, progress output, warnings, and tracebacks share a single sequence, so extract each family with its own pattern and reconstruct the timeline by position in the file. Anchor on the run's own line formats, and treat traceback blocks as units so their lines are not mistaken for metrics.

Not specified by the original author.

TL;DR

Fix this in the parser for the SOAR playbook run log by acting on the exact message first: before parsing the SOAR playbook run log, detect the log format version first, select the matching parser, and skip banner or progress lines the older parser chokes on; keep the original file untouched so the parse can be replayed. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.

parser failed on SOAR playbook run log

Use this when

• The operation in the parser for the SOAR playbook run log fails with this exact message: parser failed on SOAR playbook run log.
• The same failure repeats on retry with unchanged inputs.
• A review, export or check is blocked until this item completes.

Not for this skill when

• The message is a permission or outage notice from the platform. Resolve that first, then return here if this error remains.
• The operation completes and you only disagree with its output. That is a quality review, not this failure.

Steps

1. Reproduce the failure with the smallest scope that still shows it in the parser for the SOAR playbook run log, and copy the full message plus the alert, incident or enrichment record involved into the run notes. Verify: the error is reproduced on demand with a named item, not only seen in a log.
2. Apply the specific fix for this error: before parsing the SOAR playbook run log, detect the log format version first, select the matching parser, and skip banner or progress lines the older parser chokes on; keep the original file untouched so the parse can be replayed. Verify: the repaired SOAR playbook run log parses end to end and the parsed record count matches the source count.
3. Check the neighbouring items that share the same config, template, feed or credential, because this class of failure rarely affects only one item. Verify: the neighbouring items are listed and each is marked affected or clear.
4. Compare the result counts, decisions or alerts against the source in the parser for the SOAR playbook run log so a silent partial success is caught before sign off. Verify: counts match the source or every difference is named and explained.
5. Rerun the original operation in the parser for the SOAR playbook run log on the previously failing scope, watching for the same message rather than assuming success from a quiet log. Verify: the operation completes and the original message does not appear.
6. Record the fix, the triggering input and the verification result on the item so the next occurrence is recognised immediately. Verify: the record names the error, the fix applied and the evidence of success.

Why it happens

the parser assumed a clean, current format, and the real SOAR playbook run log broke one of those assumptions, so parsing stopped at the first bad structure instead of reporting it.

Variant phrasings

parser failed on SOAR playbook run log

The verbatim form searchers paste from the terminal or console. Treat it identically: same fix, same single item proof, then the full rerun.

How to fix: parser failed on SOAR playbook run log error parsing failure

The how-to phrasing for the same failure in the parser for the SOAR playbook run log. The steps above apply unchanged; start at the reproduction step rather than skipping to the rerun.

the parser for the SOAR playbook run log troubleshooting for this failure

The symptom-first phrasing used when the console hides the full message. Surface the full message first, confirm it matches the code block above, then follow the steps.

Compatibility: the parser for the SOAR playbook run log at current versions, plus the platform API or console the query names; no extra tooling beyond a text editor and the source system access needed to verify counts.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst__HllqZUwGHKm0jhxUXKp1g

Resolved from the public thread: https://vectle.com/posts/pst__HllqZUwGHKm0jhxUXKp1g

Thread query: parser failed on SOAR playbook run log error parsing failure

TL;DR: Fix this in the parser for the SOAR playbook run log by acting on the exact message first: before parsing the SOAR playbook run log, detect the log format version first, select the matching parser, and skip banner or progress lines the older parser chokes on; keep the original file untouched so the parse can be replayed. Do not rerun the whole job unchanged, because the same inputs produce the same failure. Prove the fix on one item, then rerun the full scope and reconcile the counts.