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HUE-8888 [docs] Refresh the high level architecture diagram

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docs/docs-site/content/administrator/administration/reference.md

@@ -20,9 +20,9 @@ In practice ~50 users / Hue peak time is the rule of thumb. This is accounting f
 
 
 ## General Performance
 ## General Performance
 
 
-* Hue must be behing a load balancer proxying static files. In Cloudera Manager Hue ships with HTTPD.
+* Hue must be behing a load balancer proxying static files. e.g. NGINX is used for the containers, Cloudera Hue ships with HTTPD.
 * Adding more Hue instances behind the load balancer will increase performances by 50 concurrent users.
 * Adding more Hue instances behind the load balancer will increase performances by 50 concurrent users.
-* Database backend should be such as MySql/Postgres/Oracle. Hue does not work on SQLite as it makes concurrent calls to the database.
+* Database backend should be such as MySql/Postgres/Oracle. Hue does not work on SQLite as it makes concurrent write calls to the database.
 * Check the number of documents in the Hue database. If they are too many (more than 100 000), delete the old records:
 * Check the number of documents in the Hue database. If they are too many (more than 100 000), delete the old records:
   Stop the Hue service. Log on to the host of your Hue server. Go to Hue directory and run following clean up [command](/administrator/administration/operations/#commands):
   Stop the Hue service. Log on to the host of your Hue server. Go to Hue directory and run following clean up [command](/administrator/administration/operations/#commands):
 
 

+ 2 - 0
docs/docs-site/content/developer/development/_index.md

@@ -101,6 +101,8 @@ saved queries in the database.)
 In addition to the web server, some Hue applications run
 In addition to the web server, some Hue applications run
 daemon processes "on the side". Some examples are the `Celery Task Server`, `Celery Beat`.
 daemon processes "on the side". Some examples are the `Celery Task Server`, `Celery Beat`.
 
 
+![Reference Architecture](/images/hue_architecture.png)
+
 ### Interacting with external services
 ### Interacting with external services
 
 
 ![Interacting with Hadoop](/images/interactingwithhadoop.png)
 ![Interacting with Hadoop](/images/interactingwithhadoop.png)

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