npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@clickup/pg-microsharding

v2.12.4

Published

Microshards support for PostgreSQL

Downloads

10

Readme

@clickup/pg-microsharding: microshards support for PostgreSQL

See also TS API documentation.

CI run

Each microshard is a PG schema with numeric suffix. Microshards have the same set of tables with same names; it's up to the higher-level tools to keep the schemas of all those tables in sync (e.g. see pg-mig tool).

Microshards can be moved from one PG master to another. There is no need to stop writes while moving microshards: the tool uses PG logical replication to stream each microshard table's data, and in the very end, acquires a quick exclusive lock to finalize the move.

Each microshard can either be "active" or "inactive".

The library exposes command-line tool pg-microsharding. Some (non-exhaustive) list of commands:

  • pg-microsharding list
  • pg-microsharding allocate --shards=N-M ...
  • pg-microsharding move --shard=N --from=DSN --to=DSN ...
  • pg-microsharding rebalance ...
  • pg-microsharding cleanup
  • ...
  • run the tool to see other commands, options and environment variables.

The tool accepts parameters using the following ways:

  1. Via command line arguments, see built-in help.
  2. Via environment variables: PGUSER, PGPASSWORD, PGHOST, PGPORT, PGDATABASE, PGSSLMODE etc. It also recognizes several additional variables, like PGDSNS and MIGRATE_CMD.
  3. Via pg-microsharding.config.js file if it's found in the current folder or below. The file should export an object with environment variable names in keys and strings in values.

The tool exposes a performant PostgreSQL stored functions API for microshards discovery (it's supposed to be called from all nodes of the cluster from time to time):

  • microsharding.microsharding_list_active_shards(): returns the list of "active" shards as an array.

It also provides system administration stored functions API:

  • microsharding_do_on_each(): a helper function to run an SQL query on all shards
  • microsharding_debug_views_create(): creates "debug views" for tables in all microshards that union SELECTs from the same-named tables in all shards (not used in production, only for debugging purposes)
  • microsharding_debug_views_drop(): drops all of the debug views
  • microsharding_debug_fdw_create(): creates "debug foreign shards schemas" for each host in the list
  • microsharding_debug_fdw_drop(): drops all debug foreign shards schemas previously created

And some lower level APIs:

  • microsharding_ensure_exist(): allocates a new range of microshards
  • microsharding_ensure_active(): activates a range of microshards
  • microsharding_ensure_inactive(): deactivates a range of microshards
  • microsharding_ensure_absent(): drops a range of microshards