cstore_fdw
ZLib
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cstore_fdw | ZLib | |
---|---|---|
6 | 49 | |
1,738 | 5,278 | |
0.4% | - | |
2.6 | 8.9 | |
about 3 years ago | 14 days ago | |
C | C | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
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
ZLib
- Zlib 1.3.1 Out
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Vulnerability found after scanning debian 12 bookworm VM
A fix has been checked into the upstream git repo: https://github.com/madler/zlib/pull/843 but a release has not yet been made including it.
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ZLib VS jdeflate - a user suggested alternative
2 projects | 25 Nov 2023
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CVE-2023-4863: Heap buffer overflow in WebP (Chrome)
So the real issue here is that the lack of tree validation before the tree construction, I believe. I'm surprised that this check was not yet implemented (I actually checked libwebp to make sure that I was missing one). Given this blind spot, an automated test based on the domain knowledge is likely useless to catch this bug.
[1] https://github.com/madler/zlib/blob/master/examples/enough.c
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Notes: Advanced Node.js Concepts by Stephen Grider
In the source code of the Node.js opensource project, lib folder contains JavaScript code, mostly wrappers over C++ and function definitions. On the contrary, src folder contains C++ implementations of the functions, which pulls dependencies from the V8 project, the libuv project, the zlib project, the llhttp project, and many more - which are all placed at the deps folder.
- Zlib 1.3 · madler/zlib 09155ea
- Zlib 1.3 – A Spiffy yet Delicately Unobtrusive Compression Library
- Exploring the Internals of Linux v0.01
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Dear Pirates Donate as much as you can
Seeing the text in red got me thinking for a moment, "wow, didn't realize pirates had such love for an open-source compression library"
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Updated packages: do Arch devs update/build the original source as is or...
cd "${srcdir}/zlib-$pkgver/contrib/minizip" make install DESTDIR="${pkgdir}" install -D -m644 "${srcdir}/zlib-$pkgver/LICENSE" "${pkgdir}/usr/share/licenses/minizip/LICENSE" # https://github.com/madler/zlib/pull/229 rm "${pkgdir}/usr/include/minizip/crypt.h"
What are some alternatives?
odbc2parquet - A command line tool to query an ODBC data source and write the result into a parquet file.
zstd - Zstandard - Fast real-time compression algorithm
LZ4 - Extremely Fast Compression algorithm
cute_headers - Collection of cross-platform one-file C/C++ libraries with no dependencies, primarily used for games
Snappy - A fast compressor/decompressor
delta - An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs
LZMA - (Unofficial) Git mirror of LZMA SDK releases
parquet_fdw - Parquet foreign data wrapper for PostgreSQL
Onion - C library to create simple HTTP servers and Web Applications.
bzip3 - A better and stronger spiritual successor to BZip2.
Minizip-ng - Fork of the popular zip manipulation library found in the zlib distribution.