datasets/: stage new layer before touching live datasets in add_months
Replace mode='append'-direct-to-live approach with a safer staging workflow: Part 2 writes the new sorted layer to temp staging directories, the user verifies, then a separate copy step adds the files to the live datasets. Live datasets are never touched until the copy step, and the copy only adds files — nothing is deleted or overwritten. - sort_and_write gains out_by_subreddit/out_by_author params (replaces mode param) so Part 2 can target staging paths - comments_part2.py, submissions_part2.py: expose new params via Fire - add_months.sh: rewritten with explicit staging dirs, verify checkpoint, and find-based copy step Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
@@ -1,8 +1,8 @@
|
||||
#!/usr/bin/env bash
|
||||
#
|
||||
# Add one or more new months to the existing parquet datasets using a
|
||||
# layered append. Part 1 runs on a compute node; Part 2 must be launched
|
||||
# from a login node (it calls salloc via start_spark_and_run.sh).
|
||||
# layered append. The live datasets are never touched until the final
|
||||
# copy step, so they remain safe and queryable throughout.
|
||||
#
|
||||
# Usage:
|
||||
# add_months.sh YYYY-MM [YYYY-MM ...]
|
||||
@@ -21,15 +21,19 @@
|
||||
# SUBMISSIONS_DUMPDIR=/path/to/new/submissions \
|
||||
# ./add_months.sh 2025-01 2025-02
|
||||
#
|
||||
# How layering works: Part 2 appends a new set of sorted partition files
|
||||
# alongside the existing ones. Spark and DuckDB read all layers together
|
||||
# transparently. Run merge_layers.sh to collapse layers into one when n
|
||||
# gets large. Run build_from_scratch.sh to rebuild everything from raw dumps.
|
||||
# Workflow:
|
||||
# Part 1 — parse new .zst files into per-month parquets (compute node)
|
||||
# Part 2 — sort into staging directories, not the live datasets (fat node)
|
||||
# Verify — inspect staging before committing (manual step, not scripted)
|
||||
# Copy — move staging files into live datasets (run manually after verify)
|
||||
# Cleanup — remove temp and staging dirs (run manually after copy)
|
||||
#
|
||||
# Every command below is independently runnable for debugging. The copy
|
||||
# and cleanup steps are intentionally left as separate commands so you can
|
||||
# verify the staging output before touching the live datasets.
|
||||
#
|
||||
# NOTE: This script and its workflow are written but not yet tested.
|
||||
# Remove this notice after a successful end-to-end run.
|
||||
#
|
||||
# Every command below is independently runnable for debugging.
|
||||
|
||||
set -e
|
||||
cd "$(dirname "$0")"
|
||||
@@ -42,37 +46,79 @@ fi
|
||||
COMMENTS_DUMPDIR="${COMMENTS_DUMPDIR:-/gscratch/comdata/raw_data/reddit_dumps/comments}"
|
||||
SUBMISSIONS_DUMPDIR="${SUBMISSIONS_DUMPDIR:-/gscratch/comdata/raw_data/reddit_dumps/submissions}"
|
||||
|
||||
# Part 1 temp dirs (per-month parquets, parsed from .zst)
|
||||
TEMP_COMMENTS="/gscratch/comdata/output/temp/add_months_comments.parquet"
|
||||
TEMP_SUBMISSIONS="/gscratch/comdata/output/temp/add_months_submissions.parquet"
|
||||
|
||||
# --- Part 1: parse new months in parallel -----------------------------------
|
||||
# Staging dirs (sorted new layer; inspected before copying to live)
|
||||
STAGING_COMMENTS_SUB="/gscratch/comdata/output/temp/new_layer_comments_by_subreddit.parquet"
|
||||
STAGING_COMMENTS_AUTH="/gscratch/comdata/output/temp/new_layer_comments_by_author.parquet"
|
||||
STAGING_SUBMISSIONS_SUB="/gscratch/comdata/output/temp/new_layer_submissions_by_subreddit.parquet"
|
||||
STAGING_SUBMISSIONS_AUTH="/gscratch/comdata/output/temp/new_layer_submissions_by_author.parquet"
|
||||
|
||||
# Live dataset dirs
|
||||
LIVE_COMMENTS_SUB="/gscratch/comdata/output/reddit_comments_by_subreddit.parquet"
|
||||
LIVE_COMMENTS_AUTH="/gscratch/comdata/output/reddit_comments_by_author.parquet"
|
||||
LIVE_SUBMISSIONS_SUB="/gscratch/comdata/output/reddit_submissions_by_subreddit.parquet"
|
||||
LIVE_SUBMISSIONS_AUTH="/gscratch/comdata/output/reddit_submissions_by_author.parquet"
|
||||
|
||||
# --- Part 1: parse new months in parallel (run on a compute node) -----------
|
||||
|
||||
# build task lists for the specified months
|
||||
printf "python3 comments_part1.py parse_dump RC_%s.zst --dumpdir=\"$COMMENTS_DUMPDIR\" --outdir=\"$TEMP_COMMENTS\"\n" "$@" \
|
||||
> add_months_comments_tasks.txt
|
||||
|
||||
printf "python3 submissions_part1.py parse_dump RS_%s.zst --dumpdir=\"$SUBMISSIONS_DUMPDIR\" --outdir=\"$TEMP_SUBMISSIONS\"\n" "$@" \
|
||||
> add_months_submissions_tasks.txt
|
||||
|
||||
# parse all new comment months in parallel
|
||||
parallel --joblog add_months_comments_joblog.txt --results add_months_comments_logs \
|
||||
< add_months_comments_tasks.txt
|
||||
|
||||
# parse all new submission months in parallel
|
||||
parallel --joblog add_months_submissions_joblog.txt --results add_months_submissions_logs \
|
||||
< add_months_submissions_tasks.txt
|
||||
|
||||
# --- Part 2: sort and append new layer (run from a login node) --------------
|
||||
# --- Part 2: sort new months into staging (not the live datasets) -----------
|
||||
#
|
||||
# start_spark_and_run.sh calls salloc; run these two lines from a login node,
|
||||
# not from within an existing compute allocation.
|
||||
# start_spark_and_run.sh calls salloc — run from a login node, or replace
|
||||
# with start_spark_cluster.sh + spark-submit if already on a suitable node.
|
||||
|
||||
# append new comment layer to reddit_comments_by_{subreddit,author}.parquet
|
||||
start_spark_and_run.sh 1 comments_part2.py --indir="$TEMP_COMMENTS" --mode=append
|
||||
start_spark_and_run.sh 1 comments_part2.py \
|
||||
--indir="$TEMP_COMMENTS" \
|
||||
--out_by_subreddit="$STAGING_COMMENTS_SUB" \
|
||||
--out_by_author="$STAGING_COMMENTS_AUTH"
|
||||
|
||||
# append new submission layer to reddit_submissions_by_{subreddit,author}.parquet
|
||||
start_spark_and_run.sh 1 submissions_part2.py --indir="$TEMP_SUBMISSIONS" --mode=append
|
||||
start_spark_and_run.sh 1 submissions_part2.py \
|
||||
--indir="$TEMP_SUBMISSIONS" \
|
||||
--out_by_subreddit="$STAGING_SUBMISSIONS_SUB" \
|
||||
--out_by_author="$STAGING_SUBMISSIONS_AUTH"
|
||||
|
||||
# --- cleanup: remove temporary Part 1 files ---------------------------------
|
||||
# --- Verify: inspect staging before copying to live -------------------------
|
||||
#
|
||||
# Stop here and check that the staging output looks right before running
|
||||
# the copy step. The live datasets are untouched at this point. Example:
|
||||
#
|
||||
# ls -lah "$STAGING_COMMENTS_SUB" | head
|
||||
# python3 -c "
|
||||
# import pyarrow.parquet as pq, os
|
||||
# f = sorted(os.listdir('$STAGING_COMMENTS_SUB'))[0]
|
||||
# t = pq.read_table('$STAGING_COMMENTS_SUB/' + f, columns=['created_utc'])
|
||||
# print(t.column('created_utc')[0].as_py(), t.column('created_utc')[-1].as_py())
|
||||
# "
|
||||
|
||||
# --- Copy: add staging files into live datasets -----------------------------
|
||||
#
|
||||
# Run these lines manually after verifying staging. This is the only step
|
||||
# that touches the live datasets. It only adds new files — existing files
|
||||
# are never deleted or overwritten.
|
||||
|
||||
find "$STAGING_COMMENTS_SUB" -maxdepth 1 -type f -exec cp {} "$LIVE_COMMENTS_SUB"/ \;
|
||||
find "$STAGING_COMMENTS_AUTH" -maxdepth 1 -type f -exec cp {} "$LIVE_COMMENTS_AUTH"/ \;
|
||||
find "$STAGING_SUBMISSIONS_SUB" -maxdepth 1 -type f -exec cp {} "$LIVE_SUBMISSIONS_SUB"/ \;
|
||||
find "$STAGING_SUBMISSIONS_AUTH" -maxdepth 1 -type f -exec cp {} "$LIVE_SUBMISSIONS_AUTH"/ \;
|
||||
|
||||
# --- Cleanup: remove temp and staging dirs ----------------------------------
|
||||
#
|
||||
# Run after confirming the copy succeeded and the live datasets look right.
|
||||
|
||||
rm -rf "$TEMP_COMMENTS" "$TEMP_SUBMISSIONS"
|
||||
rm -rf "$STAGING_COMMENTS_SUB" "$STAGING_COMMENTS_AUTH"
|
||||
rm -rf "$STAGING_SUBMISSIONS_SUB" "$STAGING_SUBMISSIONS_AUTH"
|
||||
|
||||
Reference in New Issue
Block a user