Add in extra logging about size of messages

services/real-time/app/coffee/DocumentUpdaterController.coffee

@@ -3,6 +3,8 @@ settings = require 'settings-sharelatex'
 redis = require("redis-sharelatex")
 rclient = redis.createClient(settings.redis.web)
 
+MESSAGE_SIZE_LOG_LIMIT = 1024 * 1024 * 1024 # 1Mb
+
 module.exports = DocumentUpdaterController =
 	# DocumentUpdaterController is responsible for updates that come via Redis
 	# Pub/Sub from the document updater.
@@ -13,6 +15,8 @@ module.exports = DocumentUpdaterController =
 			DocumentUpdaterController._processMessageFromDocumentUpdater(io, channel, message)
 		
 	_processMessageFromDocumentUpdater: (io, channel, message) ->
+		if message.length > MESSAGE_SIZE_LOG_LIMIT
+			logger.log {length: message.length, head: message.slice(0,200)}, "large message from doc updater"
 		message = JSON.parse message
 		if message.op?
 			DocumentUpdaterController._applyUpdateFromDocumentUpdater(io, message.doc_id, message.op)

services/real-time/app/coffee/WebsocketLoadBalancer.coffee

@@ -12,11 +12,12 @@ module.exports = WebsocketLoadBalancer =
 		if !room_id?
 			logger.warn {message, payload}, "no room_id provided, ignoring emitToRoom"
 			return
-		logger.log {room_id, message, payload}, "emitting to room"
-		@rclientPub.publish "editor-events", JSON.stringify
+		data = JSON.stringify
 			room_id: room_id
 			message: message
 			payload: payload
+		logger.log {room_id, message, payload, length: data.length}, "emitting to room"
+		@rclientPub.publish "editor-events", data
 
 	emitToAll: (message, payload...) ->
 		@emitToRoom "all", message, payload...