[flink-statefun] 04/13: [FLINK-16758][docs] Port concepts material

[tz...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

tzulitai pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/flink-statefun.git

commit 95e033404a73cc1b95f2aeb00e1120bbce444b96
Author: Seth Wiesman <sj...@gmail.com>
AuthorDate: Tue Mar 24 10:58:51 2020 -0500

    [FLINK-16758][docs] Port concepts material
---
 docs/concepts/application-building-blocks.md       |  90 +++
 docs/concepts/index.md                             |  28 +
 docs/concepts/logical.md                           |  68 ++
 docs/fig/concepts/address.svg                      | 171 +++++
 docs/fig/concepts/statefun-app-blob-storage.svg    | 667 ++++++++++++++++++++
 docs/fig/concepts/statefun-app-egress.svg          | 667 ++++++++++++++++++++
 docs/fig/concepts/statefun-app-fault-tolerance.svg | 687 +++++++++++++++++++++
 docs/fig/concepts/statefun-app-functions.svg       | 667 ++++++++++++++++++++
 docs/fig/concepts/statefun-app-ingress.svg         | 667 ++++++++++++++++++++
 docs/fig/concepts/statefun-app-state.svg           | 687 +++++++++++++++++++++
 docs/fig/concepts/statefun-app.svg                 | 663 ++++++++++++++++++++
 11 files changed, 5062 insertions(+)

diff --git a/docs/concepts/application-building-blocks.md b/docs/concepts/application-building-blocks.md
new file mode 100644
index 0000000..96a8461
--- /dev/null
+++ b/docs/concepts/application-building-blocks.md
@@ -0,0 +1,90 @@
+---
+title: Application Building Blocks 
+nav-id: building-blocks
+nav-pos: 1
+nav-title: Application Building Blocks
+nav-parent_id: concepts
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+Stateful Functions provides a framework for building event drivent applications. Here, we explain important aspects of Stateful Function’s architecture.
+
+* This will be replaced by the TOC
+{:toc}
+
+## Event Ingress
+
+Stateful Function applications sit squarely in the event driven space, so the natural place to start is with getting events into the system.
+
+<p class="text-center">
+    <img width="80%" src="{{ site.baseurl }}/fig/concepts/statefun-app-ingress.svg"/>
+</p>
+
+In stateful functions, the component that ingests records into the system is called an event ingress.
+This can be anything from a Kafka topic, to a messsage queue, to an http request - anything that can get data into the system and trigger the intitial functions to begin computation.
+
+## Stateful Functions
+
+At the core of the diagram are the namesake stateful functions.
+
+<p class="text-center">
+	<img width="80%" src="{{ site.baseurl }}/fig/concepts/statefun-app-functions.svg"/>
+</p>
+
+Think of these as the building blocks for your service.
+They can message each other arbitrarily, which is one way in which this framework moves away from the traditional stream processing view of the world.
+Instead of building up a static dataflow DAG, these functions can communicate with each other in arbitrary, potentially cyclic, even round trip ways.
+
+If you are familiar with actor programming, this does share certain similarities in its ability to dynamically message between components.
+However, there are a number of significant differences.
+
+## Persisted States
+
+The first is that all functions have locally embedded state, known as persisted states.
+
+<p class="text-center">
+	<img width="80%" src="{{ site.baseurl }}/fig/concepts/statefun-app-state.svg"/>
+</p>
+
+One of Apache Flink's core strengths is its ability to provide fault-tolerant local state.
+When inside a function, while it is performing some computation, you are always working with local state in local variables.
+
+## Fault Tolerance
+
+For both state and messaging, Stateful Function's is still able to provide the exactly-once guarantees users expect from a modern data processessing framework.
+
+<p class="text-center">
+    <img width="80%" src="{{ site.baseurl }}/fig/concepts/statefun-app-fault-tolerance.svg"/>
+</p>
+
+In the case of failure, the entire state of the world (both persisted states and messages) are rolled back to simulate completely failure free execution.
+
+These guarantees are provided with no database required, instead Stateful Function's leverages Apache Flink's proven snapshotting mechanism.
+
+## Event Egress
+
+Finally, applications can output data to external systems via event egress's.
+
+<p class="text-center">
+    <img width="80%" src="{{ site.baseurl }}/fig/concepts/statefun-app-egress.svg"/>
+</p>
+
+Of course, functions perform arbitrary computation and can do whatever they like, which includes making RPC calls and connecting to other systems.
+By using an event egress, applications can leverage pre-built integrations built on-top of the Apache Flink connector ecosystem.
diff --git a/docs/concepts/index.md b/docs/concepts/index.md
new file mode 100644
index 0000000..f95bf91
--- /dev/null
+++ b/docs/concepts/index.md
@@ -0,0 +1,28 @@
+---
+title: Concepts
+nav-id: concepts
+nav-pos: 2
+nav-title: '<i class="fa fa-map-o title appetizer" aria-hidden="true"></i> Concepts'
+nav-parent_id: root
+nav-show_overview: false 
+permalink: /concepts/index.html
+always-expand: true
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
diff --git a/docs/concepts/logical.md b/docs/concepts/logical.md
new file mode 100644
index 0000000..7601b6e
--- /dev/null
+++ b/docs/concepts/logical.md
@@ -0,0 +1,68 @@
+---
+title: Logical Functions 
+nav-id: logical-functions
+nav-pos: 2
+nav-title: Logical Functions
+nav-parent_id: concepts
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+Stateful Function's are allocated logically, which means the system can support an unbounded number of instances with a finite amount of resources.
+Logical instances do not use CPU, memory, or threads when not actively being invoked, so there is no theoretical upper limit on the number of instances that can created.
+Users are encouraged to model their applications as granularly as possible, based on what makes the most sense for their application, instead of desigining applications around resource constraints.
+
+* This will be replaced by the TOC
+{:toc}
+
+## Function Address
+
+In a local environment, the address of an object is the same as a reference to it.
+But in a Stateful Function's application, function instances are virtual and their runtime location is not exposed to the user.
+Instead, an ``Address`` is used to reference a specific stateful function in the system..
+
+<p class="text-center">
+    <img width="80%" src="{{ site.baseurl }}/fig/concepts/address.svg"/>
+</p>
+
+An address is made of two components, a ``FunctionType`` and ``ID``.
+A function type is similar to a class in an object-oriented language; it declares what sort of function the address references.
+The id is a primary key, which scopes the function call to a specific instance of the function type.
+
+When a function is being invoked, all actions - including reads and writes of persisted states - are scoped to the current address.
+
+For example, imagine a there was a Stateful Function application to track the inventory of a warehouse.
+One possible implementation could include an ``Inventory`` function that tracks the number units in stock for a particular item; this would be the function type.
+There would then be one logical instance of this type for each SKU the warehouse manages.
+If it were clothing, there might be an instance for shirts and another for pants; "shirt" and "pant" would be two ids.
+Each instance may be interacted with and messaged independently.
+The application is free to create as many instances as there are types of items in inventory.
+
+## Function Lifecycle
+
+Logical functions are neither created nor destroyed, but always exist throughout the lifetime of an application.
+When an application starts, each parallel worker of the framework will create one physical object per function type.
+This object will be used to execute all logical instances of that type that are run by that particular worker.
+The first time a message is sent to an address, it will be as if that instance had always existed with its persisted states being empty.
+
+Clearing all persisted states of a type is the same as destroying it.
+If an instance has no state and is not actively running, then it occupies no CPU, no threads, and no memory.
+
+An instance with data stored in one or more of its persisted values only occupies the resources necessary to store that data.
+State storage is managed by the Apache Flink runtime and stored in the configured state backend.
diff --git a/docs/fig/concepts/address.svg b/docs/fig/concepts/address.svg
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+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
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+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
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