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MirrorHub/synapse

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When loading current ids, sort by `stream_id` to avoid incorrect overwrite and avoid errors caused by sorting alphabetical instance name which can be `null` (#13585) When loading current ids, sort by stream ID so that we don't want to overwrite the `current_position` of an instance to a lower stream ID than we're actually at ([discussion](https://github.com/matrix-org/synapse/pull/13585#discussion_r951795379)). Previously, it sorted alphabetically by instance name which can be `null` and throw errors but more importantly, accomplishes nothing. Fixes the following startup error which is why I started looking into this area: ``` $ poetry run synapse_homeserver --config-path homeserver.yaml **************************************************************** Error during initialisation: '<' not supported between instances of 'NoneType' and 'str' There may be more information in the logs. **************************************************************** ``` Somehow my database ended up looking like the following, notice the `instance_name` is `null` in the db, and we can't sort `NoneType` things. Another question is why do we see the `instance_name` as `null` sometimes instead of `master` in monolith mode? ``` $ psql synapse synapse=# SELECT * FROM stream_positions; stream_name | instance_name | stream_id -----------------+---------------+----------- account_data | master | 1242 events | master | 1787 to_device | master | 58 presence_stream | master | 485638 receipts | master | 341 backfill | master | -139106 (6 rows) synapse=# SELECT instance_name, stream_id FROM receipts_linearized; instance_name | stream_id ---------------+----------- | 211 | 3 | 4 | 212 | 213 | 224 | 228 | 164 | 313 | 253 | 38 | 321 | 324 | 189 | 192 | 193 | 194 | 195 | 197 | 198 | 275 | 79 | 339 | 340 | 82 | 341 | 84 | 85 | 91 | 119 ```

2022-08-24 19:53:46 +02:00

Fix loading the current stream position behind the actual position.