Denis Magda created IGNITE-6682:
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             Summary: Document manual cluster activation feature
                 Key: IGNITE-6682
                 URL: https://issues.apache.org/jira/browse/IGNITE-6682
             Project: Ignite
          Issue Type: Bug
      Security Level: Public (Viewable by anyone)
            Reporter: Denis Magda
            Assignee: Prachi Garg


Once Ignite persistence is enabled, the cluster has to be activated manually 
before any operation can be processed by it. That's needed to ensure that all 
the nodes that have data on disk have joined the cluster after a restart and 
that the topology is considered to be stable.

Some details can be found in this discussion:
* Usage section of this doc [1]. Look for a paragraph that starts with _"Next, 
when Ignite sees that the persistence is enabled it moves the cluster from 
active to inactive state making sure that applications cannot​ modify the data 
until allowed."_
* 
http://apache-ignite-developers.2346864.n4.nabble.com/Control-sh-script-and-cluster-activation-td20821.html

Document the manual cluster activation on a dedicated page [2] at least 
considering the following:
* Overview. Why it's required? Move the paragraph from [1] and expand if 
required.
* Show an exception that happens if you try to execute a SQL or key-value query 
or run a computation against an activated cluster.
* Explain how to activate the cluster with:
 * From command line with control.sh script. 
 * From web console.
 * From source code with {{Ignite.activate()}} method.
* Add a callout that the automatic cluster activation is to be added in the 
future. You may refer to this discussion [3].

[1] https://apacheignite.readme.io/v2.2/docs/ignite-persistence-23#section-usage
[2] https://apacheignite.readme.io/v2.2/docs/cluster-activation
[3] 
http://apache-ignite-developers.2346864.n4.nabble.com/Cluster-auto-activation-design-proposal-td20295.html



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