procrastinate
cstore_fdw
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procrastinate | cstore_fdw | |
---|---|---|
7 | 6 | |
735 | 1,738 | |
4.6% | 0.4% | |
9.6 | 2.6 | |
5 days ago | about 3 years ago | |
Python | C | |
MIT License | Apache License 2.0 |
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procrastinate
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Running Procrastinate from command line throwing exception
I did find this PR which adds a much more detailed description of what to do, although some of it is a bit outdated.
- Anything can be a message queue if you use it wrongly enough
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The Many Problems with Celery
What about https://github.com/procrastinate-org/procrastinate (postgresql task queue with transactions & stuff)
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Keep the Monolith, but Split the Workloads
If you're using PostgreSQL, then
django-postgres-queue: https://github.com/gavinwahl/django-postgres-queue
procrastinate: https://github.com/procrastinate-org/procrastinate/
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Issues/Experience with Procrastinate library for distributed tasks
We chose the Procrastinate library to run periodic tasks.
- Alchemical Queues: (task) queues on pure SQLAlchemy
- Grafana releases OnCall open source project
cstore_fdw
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Moving a Billion Postgres Rows on a $100 Budget
Columnar store PostgreSQL extension exists, here are two but I think I’m missing at least another one:
https://github.com/citusdata/cstore_fdw
https://github.com/hydradatabase/hydra
You can also connect other stores using the foreign data wrappers, like parquet files stored on an object store, duckdb, clickhouse… though the joins aren’t optimised as PostgreSQL would do full scan on the external table when joining.
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Anything can be a message queue if you use it wrongly enough
I'm definitely not from Citus data -- just a pg zealot fighting the culture war.
If you want to reach people who can actually help, you probably want to check this link:
https://github.com/citusdata/cstore_fdw/issues
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Pg_squeeze: An extension to fix table bloat
That appears to be the case:
https://github.com/citusdata/cstore_fdw
>Important notice: Columnar storage is now part of Citus
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Ingesting an S3 file into an RDS PostgreSQL table
either we go for RDS, but we stick to the AWS handpicked extensions (exit timescale, citus or their columnar storage, ... ),
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Postgres and Parquet in the Data Lke
Re: performance overhead, with FDWs we have to re-munge the data into PostgreSQL's internal row-oriented TupleSlot format again. Postgres also doesn't run aggregations that can take advantage of the columnar format (e.g. CPU vectorization). Citus had some experimental code to get that working [2], but that was before FDWs supported aggregation pushdown. Nowadays it might be possible to basically have an FDW that hooks into the GROUP BY execution and runs a faster version of the aggregation that's optimized for columnar storage. We have a blog post series [3] about how we added agg pushdown support to Multicorn -- similar idea.
There's also DuckDB which obliterates both of these options when it comes to performance. In my (again limited, not very scientific) benchmarking of on a customer's 3M row table [4] (278MB in cstore_fdw, 140MB in Parquet), I see a 10-20x (1/2s -> 0.1/0.2s) speedup on some basic aggregation queries when querying a Parquet file with DuckDB as opposed to using cstore_fdw/parquet_fdw.
I think the dream is being able to use DuckDB from within a FDW as an OLAP query engine for PostgreSQL. duckdb_fdw [5] exists, but it basically took sqlite_fdw and connected it to DuckDB's SQLite interface, which means that a lot of operations get lost in translation and aren't pushed down to DuckDB, so it's not much better than plain parquet_fdw.
This comment is already getting too long, but FDWs can indeed participate in partitions! There's this blog post that I keep meaning to implement where the setup is, a "coordinator" PG instance has a partitioned table, where each partition is a postgres_fdw foreign table that proxies to a "data" PG instance. The "coordinator" node doesn't store any data and only gathers execution results from the "data" nodes. In the article, the "data" nodes store plain old PG tables, but I don't think there's anything preventing them from being parquet_fdw/cstore_fdw tables instead.
[0] https://github.com/citusdata/cstore_fdw
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Creating a simple data pipeline
The citus extension for postgresql. https://github.com/citusdata/cstore_fdw
What are some alternatives?
rq - Simple job queues for Python
ZLib - A massively spiffy yet delicately unobtrusive compression library.
KQ - Kafka-based Job Queue for Python
odbc2parquet - A command line tool to query an ODBC data source and write the result into a parquet file.
rele - Easy to use Google Pub/Sub
zstd - Zstandard - Fast real-time compression algorithm
huey - a little task queue for python
cute_headers - Collection of cross-platform one-file C/C++ libraries with no dependencies, primarily used for games
Streamz - Real-time stream processing for python
delta - An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs
kombu - Messaging library for Python.
parquet_fdw - Parquet foreign data wrapper for PostgreSQL