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## HOWTO: Ident Table Snapshots
This will take somewhere around 15-25 GB of disk space on the database server
(under /tmp). It would probably be better to stream this transaction over a
network connection (saving database disk I/O), but I can't figure out how to do
that with plain SQL (multiple table dumps in a single session), so would need
to be a custom client.
./ident_table_snapshot.sh
Or, in production:
sudo su postgres
DATABASE_URL=fatcat_prod ./ident_table_snapshot.sh /tmp
## HOWTO: Entity Dumps
First create the entity ident table dumps (above). Note that *most* of the
metadata will be pinned to the consistent ident dump snapshot transaction
(based on revision references), but that "expanded" entities will be the most
recent version, which may have been updated. This mostly impacts expanded
releases (containers, files).
Dump locally to stdout, eg:
# local/development
cat /tmp/fatcat_ident_releases.tsv | ./target/debug/fatcat-export releases
Or, in production:
# production, as 'fatcat' user, in /srv/fatcat/src/rust:
cat /tmp/fatcat_ident_releases.tsv | ./target/release/fatcat-export release --expand files,filesets,webcaptures,container -j8 | pigz > /srv/fatcat/snapshots/release_export_expanded.json.gz
cat /tmp/fatcat_ident_creators.tsv | ./target/release/fatcat-export creator -j8 | pigz > /srv/fatcat/snapshots/creator_export.json.gz
cat /tmp/fatcat_ident_containers.tsv | ./target/release/fatcat-export container -j8 | pigz > /srv/fatcat/snapshots/container_export.json.gz
cat /tmp/fatcat_ident_files.tsv | ./target/release/fatcat-export file -j8 | pigz > /srv/fatcat/snapshots/file_export.json.gz
cat /tmp/fatcat_ident_filesets.tsv | ./target/release/fatcat-export fileset -j8 | pigz > /srv/fatcat/snapshots/fileset_export.json.gz
cat /tmp/fatcat_ident_webcaptures.tsv | ./target/release/fatcat-export webcapture -j8 | pigz > /srv/fatcat/snapshots/webcapture_export.json.gz
# redundant with "release_export_expanded"
cat /tmp/fatcat_ident_releases.tsv | ./target/release/fatcat-export release -j8 | pigz > /srv/fatcat/snapshots/release_export.json.gz
Then usually move all these files to `/srv/fatcat/snapshots/`.
## HOWTO: Dump abstracts, release identifiers, file hashes, etc
These are run as regular old commands, and can run across the network in a
couple different ways. We might not want database ports open to the network
(even cluster/VPN); on the other hand we could proabably do SSH port
forwarding anyways.
# Locally, or client running on a remote machine
psql fatcat < dump_abstracts.sql | egrep -v ^BEGIN$ | egrep -v ^ROLLBACK$ | pv -l | gzip > abstracts.json.gz
# Run on database server, write to file on remote host
psql fatcat < dump_abstracts.sql | egrep -v ^BEGIN$ | egrep -v ^ROLLBACK$ | pv -l | gzip | ssh user@host 'cat > abstracts.json.gz'
In production:
sudo -u postgres psql fatcat_prod < dump_abstracts.sql | egrep -v ^BEGIN$ | egrep -v ^ROLLBACK$ | pv -l | pigz > /srv/fatcat/snapshots/abstracts.json.gz
sudo -u postgres psql fatcat_prod < dump_file_hashes.sql | egrep -v ^BEGIN$ | egrep -v ^ROLLBACK$ | pv -l | pigz > /srv/fatcat/snapshots/file_hashes.tsv.gz
sudo -u postgres psql fatcat_prod < dump_release_extid.sql | egrep -v ^BEGIN$ | egrep -v ^ROLLBACK$ | pv -l | pigz > /srv/fatcat/snapshots/release_extid.tsv.gz
## HOWTO: Full ("private") database backup
export DATESLUG="`date +%Y-%m-%d.%H%M%S`"
time sudo -u postgres pg_dump --verbose --format=tar fatcat_prod | pigz > /srv/fatcat/snapshots/fatcat_full_dbdump_${DATESLUG}.tar.gz
In production (as of 2019-04-24, with a 283 GByte PostgreSQL database), this
takes 1h40m.
NOTE: by using the "directory" export (along with `--file`) instead of "tar"
export, it would be possible to use parallel dumping. However, this would put
additional load on both the database and underlying disk. Could also cause
issues with users/permissions.
## HOWTO: Restore full database backup
To restore, CAREFULLY, run:
sudo -u postgres pg_restore --clean --if-exists --create --exit-on-error --jobs=16 DUMP_FILE.tar
Or, in production:
sudo su postgres
time zcat fatcat_full_dbdump_2020-02-02.022209.tar.gz | pg_restore --exit-on-error --clean --if-exists --dbname fatcat_prod
In QA (as of 2019-12-13 dump), this takes about 8 hours.
To just inspect a dump:
pg_restore -l DUMP_FILE.tar.gz
## HOWTO: Public database dump
This dump will contain all tables in the backend schema, except for "private"
authentication tables. For local or non-production machines, might need to
replace the `fatcat_prod` database name.
# TODO: for production, probably want consistent serialization mode
export DATESLUG="`date +%Y-%m-%d.%H%M%S`"
sudo -u postgres pg_dump --verbose --format=tar --exclude-table-data=auth_oidc fatcat_prod | pigz > /srv/fatcat/snapshots/fatcat_public_dbdump_${DATESLUG}.tar.gz
Can also run using the remote/SSH options above.
## Uploading to Internet Archive
The `./ia_item_exports_readme.md` and `sqldump` files should be included as a
`README.md` when appropriate:
ia upload fatcat_bulk_exports_YYYY-MM-DD ia_exports_item_readme.md --remote-name=README.md
ia upload fatcat_sqldump_full_YYYY-MM-DD ia_sqldump_item_readme.md --remote-name=README.md
Uploads should can be `--no-derive` to save cluster time.
Metadata should be set as:
- item name: `fatcat_bulk_exports_YYYY-MM-DD` or `fatcat_sqldump_public_YYYY-MM-DD` (or sometimes `fatcat_sqldump_full`)
- collection: `fatcat_snapshots_and_exports`
- creator: `Internet Archive Web Group`
- date: that the dump started (UTC)
- title: "Fatcat Bulk Metadata Exports (YYYY-MM-DD)" or "Fatcat Public Database Snapshot (YYYY-MM-DD)"
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