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Add a timeout that aborts any Postgres statement taking more than 1 hour. #15853

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Jul 3, 2023
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Add a timeout that aborts any Postgres statement taking more than 1 hour. #15853

merged 2 commits into from
Jul 3, 2023

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We hit a problem where an 8-hour event search query (which the client had already walked away from) caused Postgres to not be able to vacuum, which in turn causes general DB slowness and notably
updating stream positions was slow, so event persistence was slow and an apdex page was raised.

I propose that we limit statements to 1 hour by default. I propose that we consider anything taking more than 1 hour to be a bug as it blocks Postgres from vacuuming, which is more or less essential housekeeping.

I considered going tighter but I am not sure if some of our background or admin operations might rely on longer-running queries and I think I would rather start at 1 hour and tighten later if we think that is sensible.

This limit is technically configurable but we also don't document synchronous_commit so I have chosen not to document this for now.

Base: develop

Original commit schedule, with full messages:

  1. Add a timeout to Postgres statements

@reivilibre
Add a timeout to Postgres statements
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@reivilibre
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Signed-off-by: Olivier Wilkinson (reivilibre) <[email protected]>
@reivilibre reivilibre marked this pull request as ready for review June 30, 2023 14:21
@reivilibre reivilibre requested a review from a team as a code owner June 30, 2023 14:21
@clokep clokep requested a review from a team July 1, 2023 11:15
@reivilibre reivilibre merged commit 53aa26e into develop Jul 3, 2023
@reivilibre reivilibre deleted the rei/global_statement_timeout_postgres branch July 3, 2023 10:38
@clokep clokep mentioned this pull request Jul 14, 2023
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yingziwu added a commit to yingziwu/synapse that referenced this pull request Jul 19, 2023
@yingziwu
Merge tag 'v1.88.0' into develop
55a9f8a 
This release
 - raises the minimum supported version of Python to 3.8, as Python 3.7 is now [end-of-life](https://devguide.python.org/versions/), and
 - removes deprecated config options related to worker deployment.

See [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.88/docs/upgrade.md#upgrading-to-v1880) for more information.

- Revert "Stop writing to column `user_id` of tables `profiles` and `user_filters`", which was introduced in Synapse 1.88.0rc1. ([\matrix-org#15953](matrix-org#15953))

- Add `not_user_type` param to the [list accounts admin API](https://matrix-org.github.io/synapse/v1.88/admin_api/user_admin_api.html#list-accounts). ([\matrix-org#15844](matrix-org#15844))

- Pin `pydantic` to `^=1.7.4` to avoid backwards-incompatible API changes from the 2.0.0 release.
  Contributed by @PaarthShah. ([\matrix-org#15862](matrix-org#15862))
- Correctly resize thumbnails with pillow version >=10. ([\matrix-org#15876](matrix-org#15876))

- Fixed header levels on the [Admin API "Users"](https://matrix-org.github.io/synapse/v1.87/admin_api/user_admin_api.html) documentation page. Contributed by @sumnerevans at @beeper. ([\matrix-org#15852](matrix-org#15852))
- Remove deprecated `worker_replication_host`, `worker_replication_http_port` and `worker_replication_http_tls` configuration options. ([\matrix-org#15872](matrix-org#15872))

- **Remove deprecated `worker_replication_host`, `worker_replication_http_port` and `worker_replication_http_tls` configuration options.** See the [upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.88/docs/upgrade.md#removal-of-worker_replication_-settings) for more details. ([\matrix-org#15860](matrix-org#15860))
- Remove support for Python 3.7 and hence for Debian Buster. ([\matrix-org#15851](matrix-org#15851), [\matrix-org#15892](matrix-org#15892), [\matrix-org#15893](matrix-org#15893), [\matrix-org#15917](matrix-org#15917))

- Add foreign key constraint to `event_forward_extremities`. ([\matrix-org#15751](matrix-org#15751), [\matrix-org#15907](matrix-org#15907))
- Add read/write style cross-worker locks. ([\matrix-org#15782](matrix-org#15782))
- Stop writing to column `user_id` of tables `profiles` and `user_filters`. ([\matrix-org#15787](matrix-org#15787))
- Use lower isolation level when cleaning old presence stream data to avoid serialization errors. ([\matrix-org#15826](matrix-org#15826))
- Add tracing to media `/upload` code paths. ([\matrix-org#15850](matrix-org#15850), [\matrix-org#15888](matrix-org#15888))
- Add a timeout that aborts any Postgres statement taking more than 1 hour. ([\matrix-org#15853](matrix-org#15853))
- Fix the `devenv up` configuration which was ignoring the config overrides. ([\matrix-org#15854](matrix-org#15854))
- Optimised cleanup of old entries in `device_lists_stream`. ([\matrix-org#15861](matrix-org#15861))
- Update the Matrix clients link in the _It works! Synapse is running_ landing page. ([\matrix-org#15874](matrix-org#15874))
- Fix building Synapse with the nightly Rust compiler. ([\matrix-org#15906](matrix-org#15906))
- Add `Server` to Access-Control-Expose-Headers header. ([\matrix-org#15908](matrix-org#15908))

* Bump authlib from 1.2.0 to 1.2.1. ([\matrix-org#15864](matrix-org#15864))
* Bump importlib-metadata from 6.6.0 to 6.7.0. ([\matrix-org#15865](matrix-org#15865))
* Bump lxml from 4.9.2 to 4.9.3. ([\matrix-org#15897](matrix-org#15897))
* Bump regex from 1.8.4 to 1.9.1. ([\matrix-org#15902](matrix-org#15902))
* Bump ruff from 0.0.275 to 0.0.277. ([\matrix-org#15900](matrix-org#15900))
* Bump sentry-sdk from 1.25.1 to 1.26.0. ([\matrix-org#15867](matrix-org#15867))
* Bump serde_json from 1.0.99 to 1.0.100. ([\matrix-org#15901](matrix-org#15901))
* Bump types-pyopenssl from 23.2.0.0 to 23.2.0.1. ([\matrix-org#15866](matrix-org#15866))
Fizzadar added a commit to beeper/synapse-legacy-fork that referenced this pull request Jul 27, 2023
@Fizzadar
Merge tag 'v1.88.0' into merge-1.88
f2d2258 
This release
 - raises the minimum supported version of Python to 3.8, as Python 3.7 is now [end-of-life](https://devguide.python.org/versions/), and
 - removes deprecated config options related to worker deployment.

See [the upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.88/docs/upgrade.md#upgrading-to-v1880) for more information.

- Revert "Stop writing to column `user_id` of tables `profiles` and `user_filters`", which was introduced in Synapse 1.88.0rc1. ([\matrix-org#15953](matrix-org#15953))

- Add `not_user_type` param to the [list accounts admin API](https://matrix-org.github.io/synapse/v1.88/admin_api/user_admin_api.html#list-accounts). ([\matrix-org#15844](matrix-org#15844))

- Pin `pydantic` to `^=1.7.4` to avoid backwards-incompatible API changes from the 2.0.0 release.
  Contributed by @PaarthShah. ([\matrix-org#15862](matrix-org#15862))
- Correctly resize thumbnails with pillow version >=10. ([\matrix-org#15876](matrix-org#15876))

- Fixed header levels on the [Admin API "Users"](https://matrix-org.github.io/synapse/v1.87/admin_api/user_admin_api.html) documentation page. Contributed by @sumnerevans at @beeper. ([\matrix-org#15852](matrix-org#15852))
- Remove deprecated `worker_replication_host`, `worker_replication_http_port` and `worker_replication_http_tls` configuration options. ([\matrix-org#15872](matrix-org#15872))

- **Remove deprecated `worker_replication_host`, `worker_replication_http_port` and `worker_replication_http_tls` configuration options.** See the [upgrade notes](https://github.com/matrix-org/synapse/blob/release-v1.88/docs/upgrade.md#removal-of-worker_replication_-settings) for more details. ([\matrix-org#15860](matrix-org#15860))
- Remove support for Python 3.7 and hence for Debian Buster. ([\matrix-org#15851](matrix-org#15851), [\matrix-org#15892](matrix-org#15892), [\matrix-org#15893](matrix-org#15893), [\matrix-org#15917](matrix-org#15917))

- Add foreign key constraint to `event_forward_extremities`. ([\matrix-org#15751](matrix-org#15751), [\matrix-org#15907](matrix-org#15907))
- Add read/write style cross-worker locks. ([\matrix-org#15782](matrix-org#15782))
- Stop writing to column `user_id` of tables `profiles` and `user_filters`. ([\matrix-org#15787](matrix-org#15787))
- Use lower isolation level when cleaning old presence stream data to avoid serialization errors. ([\matrix-org#15826](matrix-org#15826))
- Add tracing to media `/upload` code paths. ([\matrix-org#15850](matrix-org#15850), [\matrix-org#15888](matrix-org#15888))
- Add a timeout that aborts any Postgres statement taking more than 1 hour. ([\matrix-org#15853](matrix-org#15853))
- Fix the `devenv up` configuration which was ignoring the config overrides. ([\matrix-org#15854](matrix-org#15854))
- Optimised cleanup of old entries in `device_lists_stream`. ([\matrix-org#15861](matrix-org#15861))
- Update the Matrix clients link in the _It works! Synapse is running_ landing page. ([\matrix-org#15874](matrix-org#15874))
- Fix building Synapse with the nightly Rust compiler. ([\matrix-org#15906](matrix-org#15906))
- Add `Server` to Access-Control-Expose-Headers header. ([\matrix-org#15908](matrix-org#15908))

* Bump authlib from 1.2.0 to 1.2.1. ([\matrix-org#15864](matrix-org#15864))
* Bump importlib-metadata from 6.6.0 to 6.7.0. ([\matrix-org#15865](matrix-org#15865))
* Bump lxml from 4.9.2 to 4.9.3. ([\matrix-org#15897](matrix-org#15897))
* Bump regex from 1.8.4 to 1.9.1. ([\matrix-org#15902](matrix-org#15902))
* Bump ruff from 0.0.275 to 0.0.277. ([\matrix-org#15900](matrix-org#15900))
* Bump sentry-sdk from 1.25.1 to 1.26.0. ([\matrix-org#15867](matrix-org#15867))
* Bump serde_json from 1.0.99 to 1.0.100. ([\matrix-org#15901](matrix-org#15901))
* Bump types-pyopenssl from 23.2.0.0 to 23.2.0.1. ([\matrix-org#15866](matrix-org#15866))

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# Conflicts:
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#	.github/workflows/release-artifacts.yml
#	.github/workflows/tests.yml
#	.github/workflows/twisted_trunk.yml
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#	synapse/config/experimental.py
#	synapse/handlers/pagination.py
#	synapse/handlers/room_batch.py
#	synapse/push/bulk_push_rule_evaluator.py
#	synapse/rest/admin/users.py
#	synapse/rest/client/room_batch.py
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@H-Shay H-Shay mentioned this pull request Aug 8, 2023
Merged
@DMRobertson DMRobertson mentioned this pull request Sep 18, 2023
Open
@reivilibre reivilibre mentioned this pull request Oct 9, 2023
Merged
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@reivilibre @clokep @MatMaul