Postgres Listen Notify Does Not Scale Daily Dev This is the story of what happened, how we ended up discovering a bottleneck in the listen notify feature of postgres (the event notifier that runs based on triggers when something changes in a row), and what we ended up doing about it. this commit has eliminated the bottleneck in the postgres core. Recall.ai, a provider of meeting transcription bots, noticed that their postgresql instance was being bogged down by heavy concurrent writes.
Postgres Listen Notify Does Not Scale Commenters reiterate the article’s finding: issuing notify inside a transaction causes a global lock at commit, effectively serializing commits that use it. several people note this behavior is not mentioned in the postgres docs, which they find surprising for a lock heavy feature. Listen notify must share one database instance, so traditional scaling techniques, like adding replicas, don’t work. we fixed that by implementing pub sub in our proxy, while using postgres as the broker between its multiple instances. This is the story of what happened, how we ended up discovering a bottleneck in the listen notify feature of postgres (the event notifier that runs based on triggers when something changes in a row), and what we ended up doing about it. Postgres users often hit scaling issues — whether it's with listen notify, pgvector, or even basic relational queries. for startups, postgres is a fantastic first choice.
Postgres Listen Notify Does Not Scale This is the story of what happened, how we ended up discovering a bottleneck in the listen notify feature of postgres (the event notifier that runs based on triggers when something changes in a row), and what we ended up doing about it. Postgres users often hit scaling issues — whether it's with listen notify, pgvector, or even basic relational queries. for startups, postgres is a fantastic first choice. While signal delivery is asynchronous and relatively fast, it scales poorly: as the number of listeners increases, each notification must still wake every listening backend process. Postgres listen notify can cause severe performance issues under high write concurrency due to a global lock during commit. learn why it doesn't scale and how to avoid outages. Docs: listen notify performance considerations greetings! listen notify has known performance issues that aren't documented but regularly surprise users in production – my customers and i encountered some of them multiple times. they were also discussed in the past, e.g.,: 2008: postgresql.org message id 5215.1204048454@sss. Notify can "scale" well, but you don't want to notify in large transaction blocks. notify independently from complex application logic, and you're unlikely to experience scaling to many concurrent writers.
Use Postgres Listen Notify Server Sent Events While signal delivery is asynchronous and relatively fast, it scales poorly: as the number of listeners increases, each notification must still wake every listening backend process. Postgres listen notify can cause severe performance issues under high write concurrency due to a global lock during commit. learn why it doesn't scale and how to avoid outages. Docs: listen notify performance considerations greetings! listen notify has known performance issues that aren't documented but regularly surprise users in production – my customers and i encountered some of them multiple times. they were also discussed in the past, e.g.,: 2008: postgresql.org message id 5215.1204048454@sss. Notify can "scale" well, but you don't want to notify in large transaction blocks. notify independently from complex application logic, and you're unlikely to experience scaling to many concurrent writers.
Use Postgres Listen Notify Server Sent Events Docs: listen notify performance considerations greetings! listen notify has known performance issues that aren't documented but regularly surprise users in production – my customers and i encountered some of them multiple times. they were also discussed in the past, e.g.,: 2008: postgresql.org message id 5215.1204048454@sss. Notify can "scale" well, but you don't want to notify in large transaction blocks. notify independently from complex application logic, and you're unlikely to experience scaling to many concurrent writers.
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