element-hq / element-hq/synapse
Backfill can cause large memory spikes in private rooms
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A-Messages-Endpoint
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- Python
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Description
This issue has been migrated from [#13244](https://github.com/matrix-org/synapse/issues/13244).
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This is because we call `filter_events_for_server`, which will fetch all member events in the room at every backwards extremity when history visibility is not shared or wold readable.
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