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authorMatthew Hodgson <matthew@matrix.org>2017-01-05 11:44:44 +0000
committerMatthew Hodgson <matthew@matrix.org>2017-01-05 11:44:44 +0000
commit8e82611f3726bfd577ca77a39328c63ecb29410f (patch)
tree8d0a392577e2ad482f798c8f66f0a8fa19f830fa /synapse/federation
parentlimit total timeout for get_missing_events to 10s (diff)
downloadsynapse-8e82611f3726bfd577ca77a39328c63ecb29410f.tar.xz
fix comment
Diffstat (limited to 'synapse/federation')
-rw-r--r--synapse/federation/federation_server.py18
1 files changed, 17 insertions, 1 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index 6d76e6f917..800f04189f 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -569,7 +569,23 @@ class FederationServer(FederationBase):
                             )
 
                             # XXX: we set timeout to 10s to help workaround
-                            # https://github.com/matrix-org/synapse/issues/1733
+                            # https://github.com/matrix-org/synapse/issues/1733.
+                            # The reason is to avoid holding the linearizer lock
+                            # whilst processing inbound /send transactions, causing
+                            # FDs to stack up and block other inbound transactions
+                            # which empirically can currently take up to 30 minutes.
+                            #
+                            # N.B. this explicitly disables retry attempts.
+                            #
+                            # N.B. this also increases our chances of falling back to
+                            # fetching fresh state for the room if the missing event
+                            # can't be found, which slightly reduces our security.
+                            # it may also increase our DAG extremity count for the room,
+                            # causing additional state resolution?  See #1760.
+                            # However, fetching state doesn't hold the linearizer lock
+                            # apparently.
+                            #
+                            # see https://github.com/matrix-org/synapse/pull/1744
 
                             missing_events = yield self.get_missing_events(
                                 origin,