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feat: encode episodes to JSON one node at a time and record runs on traces - #3042

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@mikasenghaas mikasenghaas commented Nov 2, 2026 •

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Summary

  • Episode.to_json and Trace.to_json encode one node at a time.
    • Pydantic's dump and orjson each hold the GIL for a whole call. Before, each method made one call over the whole record, so encoding a large episode stalled every other thread of the process, such as an asyncio event loop, for as long as it took.
    • Each call now covers one node, and the encoder releases the GIL after each millisecond of encoding (time.sleep(0)). Without that release, a busy thread keeps the GIL until CPython's 5 ms switch interval forces a handoff, and an event loop waits that long several times per wakeup. Releasing after every node instead made encoding ~3x slower.
    • The output is byte for byte orjson.dumps(to_record(), option=OPT_SERIALIZE_NUMPY). Each trace and node is dumped as its declared field type, as the parent's dump does. The parts are joined once at the end, so the record is copied once.
  • Trace.run. Trace gets a run field, and Episode.record_run(run) sets it on the episode and on each of its traces.
    • Prime Traces reads the run from each trace (trace.run.id) and derives an episode's run from its members. So to_record() and to_json() now carry what the Prime SDK used to stamp, and the SDK can upload to_json() as it is (feat: upload an episode's own to_json when it names the run prime#1140).
    • The run types (PolicySpan, TrainWorkInfo, EvalWorkInfo, WorkInfo, TrainRunInfo, EvalRunInfo, RunInfo) move from episode.py to trace.py, which Trace needs. verifiers.v1 exports them as before.
    • The delta stream sends run with the trace header. Env servers send None; the consumer stamps the run when the episode arrives.

Verification

  • pytest tests/unit: 245 passed, 10 skipped (no harbor, no PRIME_API_KEY).

    • to_json equals orjson.dumps(to_record()) byte for byte: for a trace and an episode, with and without float rounding, with nested exclude specs (__all__ plus a per-trace index), and with a TaskData subclass.
    • record_run puts the run on the episode and every trace, to_json carries it, and the record validates back to the same run.
  • Worst event-loop stall while another thread encodes, and CPU per episode. The episodes are synthetic agentic episodes at the sizes of a production RL run:

    Episode Before: CPU / worst stall After: CPU / worst stall
    8.4 MB (production mean) 20 ms / 15 ms 21 ms / 2.3 ms
    35 MB (production p99) 81 ms / 55 ms 91 ms / 5.2 ms
    133 MB (production max) 319 ms / 191 ms 359 ms / 12 ms
  • End-to-end numbers are in feat: encode episodes for the file and prime monitors one node at a time prime-rl#4366, which writes and uploads episodes with this encoder under prime-rl's monitor load test.

Merge order

  1. feat: non-blocking, concurrent run uploads in prime-runs and prime-traces prime#1136 and feat: upload an episode's own to_json when it names the run prime#1140: merged and released as prime-runs 0.1.6 and prime-traces 0.0.12.
  2. feat: encode episodes to JSON one node at a time and record runs on traces #3042 (this PR) and feat: non-blocking, concurrent prime uploads prime-rl#4363, in either order.
  3. feat: encode episodes for the file and prime monitors one node at a time prime-rl#4366

🤖 Generated with Claude Code


Note

Medium Risk
Serialization logic is substantially rewritten (though contract-tested); wire JSON gains optional trace.run, and code that imported run types from verifiers.v1.episode must import from trace or vf instead.

Overview
Trace.to_json and Episode.to_json no longer dump the full record in one pydantic/orjson call. They build JSON in pieces (splice_json, trace_json_parts), encoding each message node separately and yielding the GIL about every millisecond so large rollouts don’t block asyncio and other threads. Output stays byte-identical to orjson.dumps(to_record(), OPT_SERIALIZE_NUMPY), including nested exclude specs and custom task types.

Run metadata moves onto each trace. Trace gains optional run, and Episode.record_run now stamps the same RunInfo on the episode and every trace in traces. The run-related models (PolicySpan, TrainRunInfo, EvalRunInfo, etc.) live in trace.py instead of episode.py; import verifiers.v1 as vf still exposes them. The live trace delta stream sends run in the trace header (often None until the consumer stamps it).

Tests assert to_json ↔ to_record parity and that stamped runs round-trip through JSON validation.

Reviewed by Cursor Bugbot for commit dabe65d. Bugbot is set up for automated code reviews on this repo. Configure here.

Episode.to_json and Trace.to_json made one pydantic dump and one
orjson call over the whole record. Both hold the GIL for the whole
call, so encoding a large episode stalled every other thread of the
process, such as an asyncio event loop, for as long as it took. They
now encode the record one node at a time and join the parts once at
the end, so the stall no longer grows with the record. The output is
byte for byte the same as orjson.dumps(to_record()).

Episode.to_json also takes a run: its fields are set on the episode's
run, and that run goes on every member trace too, as Prime Traces
reads it per trace. This lets the Prime SDK upload the encoded bytes
as they are.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Comment thread verifiers/v1/trace.py
spec = exclude.get(field)
if not isinstance(spec, dict):
return None
return merge_exclude(spec.get("__all__"), spec.get(index)) or None

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🟢 Low v1/trace.py:118

Negative-index exclusions are ignored, so trace.to_json(exclude={"nodes": {-1: {"message"}}}) serializes the last node's message instead of excluding it; the same affects Episode's traces exclusions. item_exclude receives nonnegative enumerate indices and looks up only that index, so normalize negative indices against the list length before combining the per-item exclusions.

🚀 Reply "fix it for me" or copy this AI Prompt for your agent:
In file @verifiers/v1/trace.py around line 118:

Negative-index exclusions are ignored, so `trace.to_json(exclude={"nodes": {-1: {"message"}}})` serializes the last node's `message` instead of excluding it; the same affects `Episode`'s `traces` exclusions. `item_exclude` receives nonnegative `enumerate` indices and looks up only that index, so normalize negative indices against the list length before combining the per-item exclusions.

macroscopeapp[bot]
macroscopeapp Bot previously approved these changes Nov 2, 2026
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macroscopeapp Bot commented Nov 2, 2026 •

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Approvability

Verdict: Approved at 70d081b

Macroscope's review found this PR approvable — JSON encoding now proceeds node by node to reduce thread stalls, and traces receive their episode’s run metadata. The reported negative-index exclusion limitation is below the blocking threshold, with no demonstrated consequential use in the inspected callers.

No code changes detected at dabe65d. Prior analysis still applies.

You can add or adjust custom eligibility rules. Learn more.

Short calls alone did not keep a busy event loop responsive. A thread
that keeps working keeps the GIL until CPython's switch interval (5 ms)
forces a handoff, and the event loop needs the GIL several times each
time it wakes, so its stalls added up to several intervals. to_json
now releases the GIL after each millisecond of encoding. Releasing it
after every node instead made encoding about 3x slower.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
macroscopeapp[bot]
macroscopeapp Bot previously approved these changes Nov 2, 2026
Trace stores such as Prime Traces key each trace by its own run, and
derive an episode's run from its members. Trace gets a run field, and
Episode.record_run sets it on the episode and on each of its traces,
so to_record and to_json carry it without a run parameter. The run
types move from episode.py to trace.py, which Trace needs; the package
exports them as before. The delta stream sends run with the header.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
macroscopeapp[bot]
macroscopeapp Bot previously approved these changes Nov 2, 2026
@mikasenghaas mikasenghaas changed the title feat: encode episodes and traces to JSON one node at a time feat: encode episodes to JSON one node at a time and record runs on traces Nov 2, 2026
kcoopermiller added a commit to PrimeIntellect-ai/prime that referenced this pull request Nov 2, 2026
* gzip trace uploads at level 1

The upload thread spent ~70 ms of its ~78 ms per 2 MB episode in
gzip at the default level 9, so it fell behind a fast producer and
the upload queue dropped episodes. Level 1 is ~9x faster for ~13%
more bytes on the wire.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* send up to eight trace upload requests at once

upload_lines sent one batch at a time, so network time and gzip ran
in series with encoding. It now keeps up to max_in_flight (default 8,
the most the service contract allows per producer) batches in flight
on a thread pool. gzip and hashing release the GIL, so the upload rate
is bound by record encoding alone.

on_batch still runs on the calling thread, and the receipts come back
in batch order. A failed batch stops new requests, and its error is
raised once the requests in flight have finished.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* never block the producer on a full upload queue

The upload queue held 256 submit calls, and a full queue blocked the
producer for up to 5 s before it dropped the batch. An async caller
such as the prime-rl orchestrator waited that long on its arrival
path. The queue is now bounded by records (max_queued_records, default
10,000), and submit never blocks: a batch that does not fit is dropped
and counted at once. A batch always fits an empty queue.

The traces sink also prepared every merged record as a wire mapping
before the upload started, so a backlog of large episodes was held
twice in memory. It now prepares each record as the client encodes it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* upload a record's own json encoding when it has one

TracesSink built each record's wire mapping with to_record() and
stamp_run, and prime-traces encoded it with orjson. Both calls hold
the GIL for the whole record, so a large episode stalled the
producer's other threads, such as an asyncio event loop.

A record whose to_json takes a run (verifiers Episode, from
PrimeIntellect-ai/verifiers#3042) now encodes itself with the run
stamped on, in short steps, and the sink uploads those bytes as they
are. The line is byte for byte what the sink built before. A record
whose to_json takes no run, as in released verifiers, keeps the old
path. prime-traces accepts an encoded line (bytes) as a record.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* upload to_json only for records that name this run

verifiers now records the run on an episode and each of its traces
(Episode.record_run), so its to_json() already carries what the sink
stamped. The sink uploads to_json() as it is when the record and every
member trace name this run, id and type. Any other record is stamped
as before: a producer that recorded a local run id, or an episode from
a verifiers whose traces carry no run.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Cooper Miller <kcoopermiller9@gmail.com>
…node

# Conflicts:
#	verifiers/v1/cli/eval/runner.py

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit dabe65d. Configure here.

Comment thread verifiers/v1/trace.py Resolved
mikasenghaas added a commit to PrimeIntellect-ai/prime-rl that referenced this pull request Nov 3, 2026
## Summary

Prime uploads keep up with the orchestrator, and logging to Prime never
blocks it. Companion to PrimeIntellect-ai/prime#1136.

- **SDK pin.** `prime-runs[train]>=0.1.6`, which pulls `prime-traces`
0.0.12 from PyPI. These releases contain PrimeIntellect-ai/prime#1136:
gzip level 1, up to 8 upload requests in flight, an upload queue bounded
by records whose `submit` never blocks, and lazily built upload records.
- `uv.lock` is written with uv 0.12.0 (lockfile revision 3); only the
two SDK packages change.
- **No thread hop for Prime.** `PrimeMonitor` calls `run.log_metrics`
and `run.log_episodes` directly on the event loop, not through
`asyncio.to_thread`. A queue put that never blocks needs no thread, and
each hop had to win the GIL back from the uploader thread.
- **A production-sized load test.**
`tests/unit/monitors/test_monitor_load.py`:
- **Episode sizes:** episodes draw their size from a lognormal fitted to
a production RL run (median 6.4 MB, p90 17 MB; it also matches the mean
of 8.5 MB and the p99 of 35 MB), capped at 60 MB. 1,000 episodes is ~8
GB of JSON, close to one production step of 1,024 samples.
- **Memory:** episodes share 24 traces at log-spaced sizes, so the
test's own memory stays small.
- **Fake endpoint:** the fake Traces endpoint gzips at the SDK's level
and counts lines under a lock, because the client now sends several
requests at once.
- **File monitor check:** it streams every trace chunk, since 8 GB spans
two 5 GiB chunks.
- **No expected failure:** the prime monitor at 1,000 episodes is no
longer marked as one.
- **A separate `log()` limit of 1 s.** A `log()` call may await the
monitor's own work: the file monitor awaits its write, which encodes the
episode on a worker thread, while the event loop keeps serving other
tasks. The lag limits still cover the loop.
- **The p99 lag limit rises from 50 to 100 ms.** At production sizes the
file monitor encodes each episode in one call, which stalls the event
loop with a p99 of ~60 ms on CI. Main's code shows the same stall with
this test. #4366 makes the encoder work in short steps and tightens the
limits to 25 ms p99 and 100 ms max.

## Verification

**Headline: Prime monitor, 1,000 production-sized episodes (~8 GB of
JSON), main against this branch.** Main ran this branch's test, with the
fake endpoint gzipping at main's level 9.

| | main | This branch |
|---|---|---|
| Episodes delivered | 725 of 1,000 | **1,000 of 1,000** |
| Lost to a full upload queue | 27 | 0 |
| Lost when the 60 s drain ran out | 248 | 0 |
| Slowest `log()` | up to 5 s (blocked on the full queue) | **0.6 ms** |
| Event-loop lag p99 / max | not reached (failed on delivery) | 14 / 17
ms |
| Test time | 217 s | 28 s |

**Scale: 10,000 episodes of 2.2 MB (~22 GB)**, from a local copy of the
test with the count raised:

| Setup | Result |
|---|---|
| No network time | 0 dropped; `log()` max 1.4 ms; event-loop lag p99 14
ms, max 21 ms; 570 MB peak RSS |
| 100 ms + 100 MB/s per request, 1 request in flight | 2,595 delivered
within the 60 s drain |
| Same, 4 in flight | 9,822 delivered |
| Same, 8 in flight (the default) | **10,000 delivered**; event-loop lag
p99 12 ms; 860 MB peak RSS |

The upload rate is ~180 episodes/s (~400 MB/s of JSON). Encoding the
records is the limit.

**Full load-test grid at production sizes, this branch (dev box):** 9
passed.

| 1,000 episodes | Event-loop lag p99 / max | `log()` max |
|---|---|---|
| prime | 14 / 17 ms | 0.6 ms |
| file | 47 / 93 ms | 177 ms |
| wandb | 0.9 / 0.9 ms | 0.6 ms |

**CI:** on the CI runner, the file monitor at 1,000 episodes measured
event-loop lag p99 60 ms and max 157 ms, within this PR's limits (100 /
250 ms), and `log()` up to 299 ms (limit 1 s). With #4366 the same case
measures p99 6 ms and max 12 ms.

Other checks:
- `pytest tests/unit/train/sft/test_prime_monitor.py
tests/unit/utils/test_links.py
tests/unit/orchestrator/test_episode_records.py tests/unit/train/rl -m
"not gpu"`: 29 passed.
- `uvx uv@0.12.0 lock --check` passes.

## Merge order

1. ~~PrimeIntellect-ai/prime#1136~~ and
~~PrimeIntellect-ai/prime#1140~~: merged and released as `prime-runs`
0.1.6 and `prime-traces` 0.0.12.
2. **#4363 (this PR)**: ready to merge. It does not need
PrimeIntellect-ai/verifiers#3042.
3. PrimeIntellect-ai/verifiers#3042
4. #4366

🤖 Generated with [Claude Code](https://claude.com/claude-code)


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes the hot path for RL training telemetry (episode/metrics
enqueue) and bumps external SDK versions; misbehavior could drop or
delay uploads under load, though load tests now enforce delivery and
loop responsiveness.
> 
> **Overview**
> **Prime logging no longer blocks the orchestrator event loop** by
pinning `prime-runs[train]>=0.1.6` (and `prime-traces` 0.0.12 in the
lockfile), which uses a non-blocking upload queue, concurrent uploads,
and lighter gzip.
> 
> **`PrimeMonitor`** now calls `run.log_metrics` and `run.log_episodes`
directly instead of `asyncio.to_thread`, matching SDK behavior where
enqueue never blocks.
> 
> The **monitor load test** is reworked to use **production-like episode
sizes** (lognormal ~6.4 MB median), shared trace templates for memory, a
thread-safe fake Traces API, and multi-chunk file delivery checks. The
**Prime monitor at 1,000 episodes is no longer expected to fail**;
responsiveness asserts split event-loop lag (p99 100 ms) from
per-`log()` duration (max 1 s).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
11ae629. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
@mikasenghaas
mikasenghaas merged commit 6d5edc7 into main Nov 3, 2026
64 of 65 checks passed
@mikasenghaas
mikasenghaas deleted the feat/episode-json-by-node branch November 3, 2026 00:42
mikasenghaas added a commit to PrimeIntellect-ai/prime-rl that referenced this pull request Nov 3, 2026
…ime (#4366)

## Summary

Companion to PrimeIntellect-ai/verifiers#3042 and
PrimeIntellect-ai/prime#1140 (released in `prime-runs` 0.1.6). The file
monitor and the Prime monitor encode each episode in short steps, so a
large episode no longer stalls the orchestrator's event loop for as long
as encoding it takes.

- **Pins.**
- The verifiers submodule moves to verifiers main, which includes
verifiers#3042: `to_json` encodes one node at a time and releases the
GIL every millisecond, and `record_run` records the run on every trace.
- `prime-runs` 0.1.6, already on main, contains prime#1140: the SDK
uploads `episode.to_json()` as it is when the episode and its traces
name the upload's run. The dispatcher's `record_run` makes that true for
RL episodes.
- Verifiers main also includes PrimeIntellect-ai/verifiers#3046, which
removes `vf-eval`'s platform push and verifiers' `prime-runs`
dependency. In `uv.lock` (uv 0.12.0), only the verifiers metadata
changes.
- **The file monitor writes `episode.to_json()`.**
- The stream line is byte for byte what
`orjson.dumps(episode.to_record())` gave before.
- The index row comes from `index_record(episode)`. It dumps everything
but the nodes' payloads, one trace at a time, and gives the same row.
- `ChunkedJsonl.append` takes a line in parts, so the newline is written
without copying a long line.
- **The load test's lag limits drop** from p99 100 ms and max 250 ms to
25 ms and 100 ms, so a regression shows. Across runs at production
sizes, the highest values were a p99 of 12.5 ms and a max of 22 ms.
- **A hosted orchestrator stamps the platform's run id.** A hosted
launch sets only `$RUN_ID`, not `$PRL_RUN_ID`, so the orchestrator
stamped episodes with a random id, and the SDK re-stamped every upload.
It now falls back to `$RUN_ID`, the Prime run id.

## Verification

**Headline: event-loop lag at 1,000 production-sized episodes (~8 GB of
JSON)**, monitor load test, dev box:

| | Main (before) | This PR |
|---|---|---|
| prime: lag p99 / max | 14 / 17 ms | **3.1 / 3.5 ms** |
| file: lag p99 / max | 47 / 93 ms | **4.8 / 15 ms** |
| file: `log()` max | 177 ms | 195 ms |

- **A second run:** inside the full unit suite, with more load on the
box, it measured prime 11 / 18 ms, file 5.2 / 22 ms, and file `log()`
max 224 ms.
- **Why the GIL release matters:** encoding node by node without it left
the file monitor at 15–18 / 31–66 ms, varying from run to run. A busy
encoder thread keeps the GIL until CPython's 5 ms switch interval forces
a handoff, and the event loop waits that out several times per wakeup.

**The stall no longer grows with the episode.** One thread encodes
episodes of 10 to 10,000 turns (1,000 tokens per turn) while a 5 ms
ticker on the event loop records the worst stall. Medians of 5 runs,
under the orchestrator's GC policy:

| Turns | Episode | Encode CPU, before / after | Worst stall, before |
Worst stall, after |
|---|---|---|---|---|
| 10 | 0.2 MB | 0.4 / 0.5 ms | 5.5 ms | 5.2 ms |
| 100 | 2.2 MB | 4.0 / 4.5 ms | 8.0 ms | 1.6 ms |
| 1,000 | 22 MB | 50 / 51 ms | 40 ms | 3.1 ms |
| 3,000 | 65 MB | 152 / 167 ms | 100 ms | 5.2 ms |
| 10,000 | 217 MB | 508 / 571 ms | 326 ms | 15 ms |

- **Before:** the stall grows linearly with the episode.
- **After:** it stays around 2–5 ms up to 3,000 turns, about the GIL
switch interval. The 10-turn case is that interval alone, since each
episode encodes in under a millisecond.
- **The rest at 10,000 turns:** the trace header's pydantic dump, which
holds every model call (one per turn). Alone it stalls 4.4 / 8.4 / 15 ms
at 1,000 / 3,000 / 10,000 turns. Agentic episodes in production have a
few hundred turns, so this part stays small. Encoding the calls one at a
time, like the nodes, would remove it.
- **CPU:** encoding costs up to ~12% more, from the extra calls and GIL
releases.

**Encoding:** `test_received_episode_encodes_as_its_record_did` sends a
two-trace episode over the real delta wire into a `WireEpisode`. Then:
- the file monitor's stream line equals `orjson.dumps(to_record())`,
byte for byte;
- its index row equals the row from the full record;
- after `record_run`, the SDK takes the episode's own `to_json()`, which
carries the same record as the old stamped line.

**Tests:** `pytest tests/unit -m "not gpu"`: 1,077 passed, 7 failed. The
same 7 fail on main on this dev box: an attention kernel without sm_120
support, and no ninja for the CPU Adam extension.

**CI:** on the CI runner, the file monitor at 1,000 production-sized
episodes measured event-loop lag p99 6.0 ms and max 12 ms, against 63 /
152 ms on main. Its slowest `log()` was 382 ms, under the 1 s limit.


🤖 Generated with [Claude Code](https://claude.com/claude-code)


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes affect how every episode is persisted and indexed and how run
identity is chosen on hosted launches; behavior is contract-tested but
touches high-volume I/O on the training path.
> 
> **Overview**
> Large episodes no longer block the orchestrator event loop during
trace logging. The **file monitor** writes stream lines with
**`episode.to_json()`** (incremental, GIL-friendly encoding from
verifiers) instead of a single **`orjson.dumps(to_record())`**, and
builds index rows via new **`index_record()`** so summarization skips
heavy node payloads without materializing the full record first.
**`ChunkedJsonl.append`** accepts **byte parts** so the newline is
appended without copying megabyte-scale lines.
> 
> The orchestrator **`run_id`** now falls back to **`$RUN_ID`** when
**`$PRL_RUN_ID`** is unset, so hosted runs align with the platform id
and Prime uploads are not re-stamped with a random id.
> 
> Monitor load tests use **stricter event-loop lag thresholds** to catch
regressions. A new unit test asserts on-disk bytes and SDK upload JSON
still match the legacy **`to_record()`** encoding.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
f83e849. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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