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Update replication stream docs to better describe role of <code>POSITION</code>

A-Docsthings relating to the documentationthings relating to the documentation

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#16560 In matrix-org/synapse;

· erikjohnston opened on Oct 27, 2023

Event creation rate limiting happens very late in a worker environment

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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.

#16481 In matrix-org/synapse;

· richvdh opened on Oct 12, 2023

When a worker cannot connect to another the log messages are unhelpful

A-LoggingSynapse's logs (structured or otherwise). Not metrics.Synapse's logs (structured or otherwise). Not metrics.

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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.

#16303 In matrix-org/synapse;

· grinapo opened on Sep 11, 2023

Metrics work through http listener when enable_metrics false

A-Metricsmetrics, measures, stuff we put in Prometheusmetrics, measures, stuff we put in Prometheus

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#16222 In matrix-org/synapse;

· tcpipuk opened on Sep 1, 2023

An idle event persister can hold up outbound federation of PDUs and other processes

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#15595 In matrix-org/synapse;

· squahtx opened on May 15, 2023

Federation sender worker not federating messages when using multiple stream writers

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#14928 In matrix-org/synapse;

· tonkku107 opened on Jan 27, 2023

Race condition with replication means <code>/messages</code> backfill lacks read-after-write consistency between workers

A-TestingIssues related to testing in complement, synapse, etcIssues related to testing in complement, synapse, etc

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Z-Read-After-WriteA lack of read-after-write consistency, usually due to cache invalidation races with workersA lack of read-after-write consistency, usually due to cache invalidation races with workers

Status: Open.

#14211 In matrix-org/synapse;

· MadLittleMods opened on Oct 17, 2022

Race condition with replication means that publishing room aliases lacks read-after-write consistency between workers

A-TestingIssues related to testing in complement, synapse, etcIssues related to testing in complement, synapse, etc

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Z-Read-After-WriteA lack of read-after-write consistency, usually due to cache invalidation races with workersA lack of read-after-write consistency, usually due to cache invalidation races with workers

Status: Open.

#14210 In matrix-org/synapse;

· DMRobertson opened on Oct 17, 2022

Sync current token may be ahead of event stream cache position using workers

A-Syncdefects related to /syncdefects related to /sync

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#14158 In matrix-org/synapse;

· Fizzadar opened on Oct 12, 2022

Sync race with get rooms for user cache invalidation over replication

A-Syncdefects related to /syncdefects related to /sync

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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.

#14154 In matrix-org/synapse;

· Fizzadar opened on Oct 12, 2022

Python entrypoints vs <code>worker_app</code> are very confusing

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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

Status: Open.

#13644 In matrix-org/synapse;

· richvdh opened on Aug 26, 2022

Docker and scalability

A-ConfigConfiguration, or the documentation thereofConfiguration, or the documentation thereof

A-WorkersProblems related to running Synapse in Worker Mode (or replication)Problems related to running Synapse in Worker Mode (or replication)

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.

#13555 In matrix-org/synapse;

· max06 opened on Aug 18, 2022