Add thoughts about recursive removal of resource

docs/removal.md

@@ -0,0 +1,29 @@
+# Problems to solve with removal operation
+
+1. It is tricky to figure out what to do with data that will be left when
+you are removing resource that is a parent for other resources.
+
+The basic example is a node resource.
+If hosts_file1 subscribed to node properties, and we will just remove
+node - hosts_file1 will be left with corrupted data.
+Validation is not a solution, because we can not expect user to remove
+each resource one-by-one.
+
+log task=hosts_file1.run uid=c1545041-a5c5-400e-8c46-ad52d871e6c3
+    ++ ip: None
+    ++ ssh_user: None
+    ++ hosts: [{u'ip': None, u'name': u'riak_server1.solar'}]
+    ++ ssh_key: None
+
+Proposed solution:
+
+Add `solar res remove node1 -r` where *r* stands for recursive.
+During this operation we will find all childs of specified resource, and
+stage them for removal as well.
+
+2. If so we need to be able to determine what to do with child resource
+on removal.
+Basically this seems like another type of event:
+hosts1.remove -> success -> node1.remove
+And
+hosts2.update -> success -> node2.remove