mashu-data/reddit-comments-sample

Reddit Comment Trees Sample — Initial snapshot

Initial sample: 43,913 posts and 59,874 comments across three communities. This is a selected, structurally checked snapshot, with incomplete subreddit coverage. It is not a complete three-month archive.

Overview

Posts and associated comments from r/LocalLLaMA, r/wallstreetbets, and r/SkincareAddiction. The requested post window is June 1–August 31, 2026 in Asia/Shanghai, with UTC bounds 2026-05-31 16:00:00 inclusive to 2026-08-31 16:00:00 exclusive. This window is not calendar Q2 or Q3. Only candidates with resolved stored relationships, no outstanding pagination or review flags, and counts matching the collector's expected count are included. These checks do not prove upstream recall. link_id, parent_id, and recomputed depth preserve the relationships in the selected records.

Why this dataset exists

Public Reddit archives include data after the 2023 API changes; freshness alone is not a unique feature. This sample focuses on documented time coverage, explicit post/comment relationships, typed columns, and reproducible collection snapshots. The three communities provide examples of AI discussion, market discussion, and consumer product feedback. The release will report observed gaps instead of treating unavailable records as successfully collected data.

Coverage

Subreddit	Posts	Comments	Observed post timestamps (UTC, inclusive endpoints)	Maximum depth
LocalLLaMA	3,778	21,850	2026-05-31T16:13:21+00:00 to 2026-08-31T15:31:52+00:00	15
wallstreetbets	10,310	12,500	2026-05-31T16:17:43+00:00 to 2026-08-31T15:53:36+00:00	10
SkincareAddiction	29,825	25,524	2026-05-31T16:04:12+00:00 to 2026-08-31T15:58:30+00:00	9

Observed endpoints do not establish gap-free coverage. Historical post discovery remains incomplete. The sample includes zero-comment posts and disproportionately small comment trees; it is not a representative or balanced sample of these communities. The date window selects posts. Associated comments retain their collection-time snapshot, including comments newer than the post window. Per-community comment dates, depth distributions, deletion/removal ratios, null counts and file checksums are measured in stats/summary.json.

Schema

Both tables use Parquet with Zstandard compression. Text is not truncated; timestamps are Unix seconds in UTC. Media files are not included. Preserve source text, except any documented anonymization. No additional anonymization is applied. Missing or unsupported scalar fields remain null, including unknown authors; null is not converted to [deleted]. Community names are normalized against each linked post. All non-key scalar fields may be null.

Posts

Field	Type	Description
id	string	Post ID without the t3_ prefix
subreddit	string	One of the three listed communities
author	string	Source author; deleted accounts use [deleted]
created_utc	int64	Post creation time, Unix seconds UTC
title	string	Original post title
selftext	string	Original post text; empty string for a link post
url	string	External URL or post permalink
score	int32	Score snapshot at collection time
upvote_ratio	float32	Source upvote ratio
num_comments	int32	Reddit's displayed count; may differ from collected rows
flair	string	Nullable post flair
is_nsfw	bool	Source NSFW flag
permalink	string	Reddit permalink
crawled_at	int64	Collection time, Unix seconds UTC
batch_id	string	Collection batch identifier

Comments

Field	Type	Description
id	string	Comment ID without the t1_ prefix
subreddit	string	Same community as the linked post
link_id	string	Linked post ID without the t3_ prefix
parent_id	string	Unprefixed parent ID; top-level comments use link_id
depth	int16	Top-level comments have depth 0
author	string	Source author; deleted accounts use [deleted]
created_utc	int64	Comment creation time, Unix seconds UTC
body	string	Original text; preserve [deleted] and [removed] markers
score	int32	Score snapshot at collection time
is_submitter	bool	Whether the author is the post's submitter
permalink	string	Reddit permalink
crawled_at	int64	Collection time, Unix seconds UTC
batch_id	string	Collection batch identifier

Resolve a depth-0 parent against posts; resolve a deeper parent against comments, within the same subreddit and link_id. Post and comment IDs belong to different namespaces even when their prefixes are removed. The two HF configurations are posts and comments, each with a train split used as a storage partition, not a predefined ML training benchmark. Subreddit folders group files; they do not automatically become separate HF configurations.

Collection method and known gaps

Collected through an existing Reddit business API using multiple third-party providers. Initial and continuation results were merged by post/comment ID. The exported snapshot was prepared at 2026-09-12T14:48:06+00:00.

All selected records pass post-scope, unique-ID, parent-resolution, cycle, derived-depth and stored-comment-count checks. Comment text was compared with the source database without truncation. At least 24 randomly selected comments were manually inspected across the three communities. Local Parquet loading was checked with datasets, pandas and DuckDB.

Full tree completeness and complete subreddit recall are not asserted: unavailable posts, source-side omissions, historical search gaps and all unresolved review records are outside this sample. Placeholder comment IDs such as deleted are excluded by excluding affected threads; valid IDs with [deleted] or [removed] text are retained.

Source usernames and public text are retained when provided. Moderator and bot replies, removed-content notices, informal language and potentially offensive text may be present; this is not a filtered human-only conversation dataset. Media, credentials, private messages and raw API responses are not included.

Scores, displayed post comment counts and comment rows come from different collection snapshots. The displayed num_comments field is not a lifetime total or a completeness guarantee.

Load the data

Choose one of the two real Parquet configurations. The files contain source records, not placeholder rows. Choose a config explicitly because posts and comments have different schemas. See examples/load.py for separate datasets, pandas, and DuckDB examples.

from datasets import load_dataset
comments = load_dataset("mashu-data/reddit-comments-sample", "comments", split="train", streaming=True)
print(next(iter(comments)))

import duckdb
from huggingface_hub import hf_hub_download

path = hf_hub_download(
    repo_id="mashu-data/reddit-comments-sample",
    repo_type="dataset",
    filename="data/comments/subreddit=LocalLLaMA/part-0.parquet",
)
con = duckdb.connect()
con.execute("""
    SELECT id, link_id, parent_id, depth
    FROM read_parquet(?, hive_partitioning=false) LIMIT 20
""", [path]).df()

Full dataset and custom delivery

Need more communities, a longer time range, or specific fields? Contact Mashu Data. Ask about verified batch availability and custom subreddit, date-range or field selection before ordering. This sample does not establish availability of 20 communities, a complete 12-month archive or scheduled weekly updates. Website: mashudata.com.

License and use

The sample is designated CC BY-NC 4.0 for non-commercial research use, to the extent Mashu Data holds rights in the released material. Reddit users retain rights in their content; the repository license does not replace those rights or grant rights held by third parties. For commercial use or delivery terms, contact Mashu Data. Cite the dataset repository and the exact revision used in your work; this dataset is not affiliated with or endorsed by Reddit.