Commit graph

13 commits

Author SHA1 Message Date
Patrick Cloke
5c8870cb28
Fix-up incorrect spellings in docs. (#16282) 2023-09-08 09:47:36 -04:00
Mathieu Velten
9228ae633f
Add some clarification to the doc/comments regarding TCP replication (#15354) 2023-03-30 12:51:35 +02:00
Erik Johnston
66f4949e7f
Fix deleting pushers when using sharded pushers. (#9465) 2021-02-22 21:14:42 +00:00
Erik Johnston
8de3703d21
Make event persisters periodically announce position over replication. (#8499)
Currently background proccesses stream the events stream use the "minimum persisted position" (i.e. `get_current_token()`) rather than the vector clock style tokens. This is broadly fine as it doesn't matter if the background processes lag a small amount. However, in extreme cases (i.e. SyTests) where we only write to one event persister the background processes will never make progress.

This PR changes it so that the `MultiWriterIDGenerator` keeps the current position of a given instance as up to date as possible (i.e using the latest token it sees if its not in the process of persisting anything), and then periodically announces that over replication. This then allows the "minimum persisted position" to advance, albeit with a small lag.
2020-10-12 15:51:41 +01:00
Erik Johnston
d7983b63a6
Support any process writing to cache invalidation stream. (#7436) 2020-05-07 13:51:08 +01:00
Erik Johnston
37f6823f5b
Add instance name to RDATA/POSITION commands (#7364)
This is primarily for allowing us to send those commands from workers, but for now simply allows us to ignore echoed RDATA/POSITION commands that we sent (we get echoes of sent commands when using redis). Currently we log a WARNING on the master process every time we receive an echoed RDATA.
2020-04-29 16:23:08 +01:00
Richard van der Hoff
71a1abb8a1
Stop the master relaying USER_SYNC for other workers (#7318)
Long story short: if we're handling presence on the current worker, we shouldn't be sending USER_SYNC commands over replication.

In an attempt to figure out what is going on here, I ended up refactoring some bits of the presencehandler code, so the first 4 commits here are non-functional refactors to move this code slightly closer to sanity. (There's still plenty to do here :/). Suggest reviewing individual commits.

Fixes (I hope) #7257.
2020-04-22 22:39:04 +01:00
Erik Johnston
4f21c33be3
Remove usage of "conn_id" for presence. (#7128)
* Remove `conn_id` usage for UserSyncCommand.

Each tcp replication connection is assigned a "conn_id", which is used
to give an ID to a remotely connected worker. In a redis world, there
will no longer be a one to one mapping between connection and instance,
so instead we need to replace such usages with an ID generated by the
remote instances and included in the replicaiton commands.

This really only effects UserSyncCommand.

* Add CLEAR_USER_SYNCS command that is sent on shutdown.

This should help with the case where a synchrotron gets restarted
gracefully, rather than rely on 5 minute timeout.
2020-03-30 16:37:24 +01:00
Erik Johnston
4cff617df1
Move catchup of replication streams to worker. (#7024)
This changes the replication protocol so that the server does not send down `RDATA` for rows that happened before the client connected. Instead, the server will send a `POSITION` and clients then query the database (or master out of band) to get up to date.
2020-03-25 14:54:01 +00:00
Erik Johnston
5d7a6ad223
Allow streaming cache invalidate all to workers. (#6749) 2020-01-22 10:37:00 +00:00
Erik Johnston
a8a50f5b57
Wake up transaction queue when remote server comes back online (#6706)
This will be used to retry outbound transactions to a remote server if
we think it might have come back up.
2020-01-17 10:27:19 +00:00
Richard van der Hoff
cc6243b4c0
document the REPLICATE command a bit better (#6305)
since I found myself wonder how it works
2019-11-04 12:40:18 +00:00
dstipp
379d2a8c39 (#5849) Convert rst to markdown (#6040)
Converting some of the rst documentation to markdown.  Attempted to
preserve whitespace and line breaks to minimize cosmetic change.
2019-09-17 12:55:29 +01:00