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authorHubert Chathi <hubert@uhoreg.ca>2019-11-06 11:59:22 -0500
committerHubert Chathi <hubert@uhoreg.ca>2019-11-06 11:59:22 -0500
commita5a59ab8ac6d6b244158261ee4d307d419b20180 (patch)
treed809f7205647c13b93a103727dab6f4a19c878e4 /docs/replication.rst
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parentMerge branch 'master' into develop (diff)
downloadsynapse-a5a59ab8ac6d6b244158261ee4d307d419b20180.tar.xz
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-Replication Architecture
-========================
-
-Motivation
-----------
-
-We'd like to be able to split some of the work that synapse does into multiple
-python processes. In theory multiple synapse processes could share a single
-postgresql database and we'd scale up by running more synapse processes.
-However much of synapse assumes that only one process is interacting with the
-database, both for assigning unique identifiers when inserting into tables,
-notifying components about new updates, and for invalidating its caches.
-
-So running multiple copies of the current code isn't an option. One way to
-run multiple processes would be to have a single writer process and multiple
-reader processes connected to the same database. In order to do this we'd need
-a way for the reader process to invalidate its in-memory caches when an update
-happens on the writer. One way to do this is for the writer to present an
-append-only log of updates which the readers can consume to invalidate their
-caches and to push updates to listening clients or pushers.
-
-Synapse already stores much of its data as an append-only log so that it can
-correctly respond to /sync requests so the amount of code changes needed to
-expose the append-only log to the readers should be fairly minimal.
-
-Architecture
-------------
-
-The Replication Protocol
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-See ``tcp_replication.rst``
-
-
-The Slaved DataStore
-~~~~~~~~~~~~~~~~~~~~
-
-There are read-only version of the synapse storage layer in
-``synapse/replication/slave/storage`` that use the response of the replication
-API to invalidate their caches.