Add grid 4 section (SeleniumHQ#461)

raju249 · AutomatedTester · diemol · web-flow · commit f16b7537a6ff · 2020-09-07T00:46:38.000+02:00
* Add grid 4 section

* Apply suggestions to index page in grid 4 for all languages

* Refactoe grid4 docs

* Change weight to earlier number

* Add image path

* Add WIP and language notification

* Add Router, SessionMap and Distributor docs

* Add standalone and hub docs

* Delete grid4.png

* Update components_of_a_grid.en.md

Co-authored-by: David Burns &lt;david.burns@theautomatedtester.co.uk&gt;
Co-authored-by: Diego Molina &lt;diemol@users.noreply.github.com&gt;
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.en.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.en.md
@@ -3,4 +3,55 @@ title: "Components"
 weight: 1
 ---
 
-> Work in progress
+## Router
+* Routes request each request to the corresponding handler.
+
+__Router__ is a point where all the requests to run a new session are sent.
+It forwards the request to __Distributor__ for further processing. It routes different
+requests based on where they are meant to be sent. It also helps to communicate with the
+Session Map. All the communication with a session is done via router.
+
+## Distributor
+* Contains information on nodes and its capabilities.
+* Selects node on which session is run.
+
+__Distributor__ is responsible for selecting the node on which your session will be run.
+It has all the information related to nodes and is aware of each node's capabilities.
+
+## SessionMap
+* Datastore mapping for session id and the node.
+
+__SessionMap__ is data store used to store the map of session id and the node on which the session is running.
+
+## Nodes
+
+* Where the browsers live
+* Registers itself to the hub and communicates its capabilities
+* Receives requests from the hub and executes them
+
+__Nodes__ are different Selenium instances
+that will execute tests on individual computer systems.
+There can be many nodes in a grid.
+The machines which are nodes do not need to be the same platform
+or have the same browser selection as that of the hub or the other nodes.
+A node on Windows might have the capability of
+offering Internet Explorer as a browser option,
+whereas this wouldn't be possible on Linux or Mac.
+
+## Hub
+* Accepts requests to run tests
+* Acts as a Router
+* Acts as a Distributor
+* Acts as a SessionMap
+* Takes instructions from client and executes them remotely on the nodes
+
+A __Hub__ is a central point where all your tests are sent.
+It allows you to run a Router, Distributor and a SessionMap on the same machine using a single command. 
+The hub needs to be reachable from the respective clients (i.e. CI server, Developer machine etc.). 
+It communicates with the node to run your selenium sessions. Instead of running each component separately, 
+you can use _hub_ role to run all 3 together.
+
+## Standalone
+
+A __Standalone__ version of Grid consists of all components running as single process, including the node.
+You can directly start running sessions after starting the standalone version of the Grid.
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.es.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.es.md
@@ -4,7 +4,7 @@ weight: 1
 ---
 
 {{% notice info %}}
-<i class="fas fa-language"></i> Page being translated from 
+<i class="fas fa-language"></i> Page being translated from
 English to Spanish. Do you speak Spanish? Help us to translate
 it by sending us pull requests!
 {{% /notice %}}
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.fr.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.fr.md
@@ -4,7 +4,7 @@ weight: 1
 ---
 
 {{% notice info %}}
-<i class="fas fa-language"></i> Page being translated from 
+<i class="fas fa-language"></i> Page being translated from
 English to French. Do you speak French? Help us to translate
 it by sending us pull requests!
 {{% /notice %}}
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.ja.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.ja.md
@@ -4,7 +4,7 @@ weight: 1
 ---
 
 {{% notice info %}}
-<i class="fas fa-language"></i> Page being translated from 
+<i class="fas fa-language"></i> Page being translated from
 English to Japanese. Do you speak Japanese? Help us to translate
 it by sending us pull requests!
 {{% /notice %}}
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.ko.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.ko.md
@@ -4,7 +4,7 @@ weight: 1
 ---
 
 {{% notice info %}}
-<i class="fas fa-language"></i> Page being translated from
+<i class="fas fa-language"></i> Page being translated from 
 English to Korean. Do you speak Korean? Help us to translate
 it by sending us pull requests!
 {{% /notice %}}
diff --git a/docs_source_files/content/grid/grid_4/components_of_a_grid.zh-cn.md b/docs_source_files/content/grid/grid_4/components_of_a_grid.zh-cn.md
@@ -4,7 +4,7 @@ weight: 1
 ---
 
 {{% notice info %}}
-<i class="fas fa-language"></i> Page being translated from 
+<i class="fas fa-language"></i> Page being translated from  
 English to Chinese. Do you speak Chinese? Help us to translate
 it by sending us pull requests!
 {{% /notice %}}
diff --git a/docs_source_files/content/grid/grid_4/setting_up_your_own_grid.de.md b/docs_source_files/content/grid/grid_4/setting_up_your_own_grid.de.md
@@ -1,5 +1,5 @@
 ---
-title: "Aufsetzen eines Grid"
+title: "Aufsetzen"
 weight: 2
 ---
 
