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Reduce user_ips bloat during dedupe background update #4626
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The background update to remove duplicate rows naively deleted and reinserted the duplicates. For large tables with a large number of duplicates this causes a lot of bloat (with postgres), as the inserted rows are appended to the table, since deleted rows will not be overwritten until a VACUUM has happened. This should hopefully also help ensure that the query in the last batch uses the correct index, as inserting a large number of new rows without analyzing will upset the query planner.
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| @@ -0,0 +1 @@ | |||
| Improve 'user_ips' table deduplication background update | |||
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Synapse 0.99.1 (2019-02-14) =========================== Features -------- - Include m.room.encryption on invites by default ([\#3902](#3902)) - Federation OpenID listener resource can now be activated even if federation is disabled ([\#4420](#4420)) - Synapse's ACME support will now correctly reprovision a certificate that approaches its expiry while Synapse is running. ([\#4522](#4522)) - Add ability to update backup versions ([\#4580](#4580)) - Allow the "unavailable" presence status for /sync. This change makes Synapse compliant with r0.4.0 of the Client-Server specification. ([\#4592](#4592)) - There is no longer any need to specify `no_tls`: it is inferred from the absence of TLS listeners ([\#4613](#4613), [\#4615](#4615), [\#4617](#4617), [\#4636](#4636)) - The default configuration no longer requires TLS certificates. ([\#4614](#4614)) Bugfixes -------- - Copy over room federation ability on room upgrade. ([\#4530](#4530)) - Fix noisy "twisted.internet.task.TaskStopped" errors in logs ([\#4546](#4546)) - Synapse is now tolerant of the `tls_fingerprints` option being None or not specified. ([\#4589](#4589)) - Fix 'no unique or exclusion constraint' error ([\#4591](#4591)) - Transfer Server ACLs on room upgrade. ([\#4608](#4608)) - Fix failure to start when not TLS certificate was given even if TLS was disabled. ([\#4618](#4618)) - Fix self-signed cert notice from generate-config. ([\#4625](#4625)) - Fix performance of `user_ips` table deduplication background update ([\#4626](#4626), [\#4627](#4627)) Internal Changes ---------------- - Change the user directory state query to use a filtered call to the db instead of a generic one. ([\#4462](#4462)) - Reject federation transactions if they include more than 50 PDUs or 100 EDUs. ([\#4513](#4513)) - Reduce duplication of ``synapse.app`` code. ([\#4567](#4567)) - Fix docker upload job to push -py2 images. ([\#4576](#4576)) - Add port configuration information to ACME instructions. ([\#4578](#4578)) - Update MSC1711 FAQ to calrify .well-known usage ([\#4584](#4584)) - Clean up default listener configuration ([\#4586](#4586)) - Clarifications for reverse proxy docs ([\#4607](#4607)) - Move ClientTLSOptionsFactory init out of `refresh_certificates` ([\#4611](#4611)) - Fail cleanly if listener config lacks a 'port' ([\#4616](#4616)) - Remove redundant entries from docker config ([\#4619](#4619)) - README updates ([\#4621](#4621))
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The background update to remove duplicate rows naively deleted and
reinserted the duplicates. For large tables with a large number of
duplicates this causes a lot of bloat (with postgres), as the inserted
rows are appended to the table, since deleted rows will not be
overwritten until a VACUUM has happened.
This should hopefully also help ensure that the query in the last batch
uses the correct index, as inserting a large number of new rows without
analyzing will upset the query planner.