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Synapse doesn't backfill missing events when rejoining a room later

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

O-OccasionalAffects or can be seen by some users regularly or most users rarelyAffects or can be seen by some users regularly or most users rarely

S-MinorBlocks non-critical functionality, workarounds exist.Blocks non-critical functionality, workarounds exist.

T-DefectBugs, crashes, hangs, security vulnerabilities, or other reported issues.Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

Status: Open.

#15717 In matrix-org/synapse;

· sbug0 opened on Jun 5, 2023

Optimize <code>/backfill</code> to respond faster

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

Status: Open.

#15653 In matrix-org/synapse;

· MadLittleMods opened on May 23, 2023

· 

Faster /messages

Don't waste time processing backfill events that we never show to the client

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

Status: Open.

#15632 In matrix-org/synapse;

· MadLittleMods opened on May 18, 2023

· 

Faster /messages

Users that knock on a room with a shared history visibility and are subsequently kicked are able to view all previous events

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

O-UncommonMost users are unlikely to come across this or unexpected workflowMost users are unlikely to come across this or unexpected workflow

S-MajorMajor functionality / product severely impaired, no satisfactory workaround.Major functionality / product severely impaired, no satisfactory workaround.

Security

T-DefectBugs, crashes, hangs, security vulnerabilities, or other reported issues.Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

Status: Open.

#13968 In matrix-org/synapse;

· zamanzamzz opened on Sep 30, 2022

Potential bugs in <code>/relations</code> endpoint

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-Relations-Endpoint/relations/relations

O-UncommonMost users are unlikely to come across this or unexpected workflowMost users are unlikely to come across this or unexpected workflow

S-MinorBlocks non-critical functionality, workarounds exist.Blocks non-critical functionality, workarounds exist.

T-TaskRefactoring, removal, replacement, enabling or disabling functionality, other engineering tasks.Refactoring, removal, replacement, enabling or disabling functionality, other engineering tasks.

Z-CleanupThings we want to get rid of, but aren't actively causing painThings we want to get rid of, but aren't actively causing pain

Status: Open.

#13862 In matrix-org/synapse;

· clokep opened on Sep 21, 2022

Generalize tracking whenever we fail to fetch or process a federated event

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

T-TaskRefactoring, removal, replacement, enabling or disabling functionality, other engineering tasks.Refactoring, removal, replacement, enabling or disabling functionality, other engineering tasks.

Status: Open.

#13700 In matrix-org/synapse;

· MadLittleMods opened on Sep 1, 2022

· 

Faster /messages

Events with lots of prev_events make backfill very slow

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

O-OccasionalAffects or can be seen by some users regularly or most users rarelyAffects or can be seen by some users regularly or most users rarely

S-MajorMajor functionality / product severely impaired, no satisfactory workaround.Major functionality / product severely impaired, no satisfactory workaround.

T-DefectBugs, crashes, hangs, security vulnerabilities, or other reported issues.Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

Status: Open.

#13677 In matrix-org/synapse;

· richvdh opened on Aug 30, 2022

We keep trying to fetch events whose keys have expired or have been invalidated

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

O-OccasionalAffects or can be seen by some users regularly or most users rarelyAffects or can be seen by some users regularly or most users rarely

S-MajorMajor functionality / product severely impaired, no satisfactory workaround.Major functionality / product severely impaired, no satisfactory workaround.

T-DefectBugs, crashes, hangs, security vulnerabilities, or other reported issues.Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

Status: Open.

#13676 In matrix-org/synapse;

· richvdh opened on Aug 30, 2022

· 

Faster /messages

backfill doesn't work if our earliest known event is a redaction

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

O-OccasionalAffects or can be seen by some users regularly or most users rarelyAffects or can be seen by some users regularly or most users rarely

S-MajorMajor functionality / product severely impaired, no satisfactory workaround.Major functionality / product severely impaired, no satisfactory workaround.

T-DefectBugs, crashes, hangs, security vulnerabilities, or other reported issues.Bugs, crashes, hangs, security vulnerabilities, or other reported issues.

Status: Open.

#13675 In matrix-org/synapse;

· richvdh opened on Aug 30, 2022

Add <code>limit</code> to <code>get_current_hosts_in_room</code>

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

O-UncommonMost users are unlikely to come across this or unexpected workflowMost users are unlikely to come across this or unexpected workflow

S-TolerableMinor significance, cosmetic issues, low or no impact to users.Minor significance, cosmetic issues, low or no impact to users.

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

Status: Open.

#13659 In matrix-org/synapse;

· MadLittleMods opened on Aug 30, 2022

· 

Faster /messages

<code>have_seen_events</code> is eating up time while processing state and auth events while backfilling

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

O-UncommonMost users are unlikely to come across this or unexpected workflowMost users are unlikely to come across this or unexpected workflow

S-MinorBlocks non-critical functionality, workarounds exist.Blocks non-critical functionality, workarounds exist.

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

Status: Open.

#13625 In matrix-org/synapse;

· MadLittleMods opened on Aug 25, 2022

· 

Faster /messages

<code>/state_ids</code> is slow to respond

A-Federation

A-Messages-Endpoint/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)/messages client API endpoint (`RoomMessageListRestServlet`) (which also triggers /backfill)

A-PerformancePerformance, both client-facing and admin-facingPerformance, both client-facing and admin-facing

O-UncommonMost users are unlikely to come across this or unexpected workflowMost users are unlikely to come across this or unexpected workflow

S-MajorMajor functionality / product severely impaired, no satisfactory workaround.Major functionality / product severely impaired, no satisfactory workaround.

T-EnhancementNew features, changes in functionality, improvements in performance, or user-facing enhancements.New features, changes in functionality, improvements in performance, or user-facing enhancements.

Status: Open.

#13620 In matrix-org/synapse;

· MadLittleMods opened on Aug 24, 2022

· 

Faster /messages