Author: jxue
Date: Mon Jul 20 23:54:40 2020
New Revision: 1880089
URL: http://svn.apache.org/viewvc?rev=1880089&view=rev
Log:
Site checkin for project Apache Helix :: Website
Added:
helix/site-content/1.0.1-docs/images/CustomizedViewSystemArchitecture.jpeg
(with props)
helix/site-content/1.0.1-docs/tutorial_customized_view.html
Modified:
helix/site-content/1.0.1-docs/Tutorial.html
helix/site-content/1.0.1-docs/releasenotes/release-1.0.1.html
Modified: helix/site-content/1.0.1-docs/Tutorial.html
URL:
http://svn.apache.org/viewvc/helix/site-content/1.0.1-docs/Tutorial.html?rev=1880089&r1=1880088&r2=1880089&view=diff
==============================================================================
--- helix/site-content/1.0.1-docs/Tutorial.html (original)
+++ helix/site-content/1.0.1-docs/Tutorial.html Mon Jul 20 23:54:40 2020
@@ -176,6 +176,7 @@ under the License. -->
</ol></li>
<li><a href="./tutorial_rest_service.html">Helix REST Service 2.0</a></li>
<li><a href="./tutorial_ui.html">Helix UI Setup</a></li>
+ <li><a href="./tutorial_customized_view.html">Helix Customized
View</a></li>
</ol>
</div>
<div class="section">
Added:
helix/site-content/1.0.1-docs/images/CustomizedViewSystemArchitecture.jpeg
URL:
http://svn.apache.org/viewvc/helix/site-content/1.0.1-docs/images/CustomizedViewSystemArchitecture.jpeg?rev=1880089&view=auto
==============================================================================
Binary file - no diff available.
Propchange:
helix/site-content/1.0.1-docs/images/CustomizedViewSystemArchitecture.jpeg
------------------------------------------------------------------------------
svn:mime-type = application/octet-stream
Modified: helix/site-content/1.0.1-docs/releasenotes/release-1.0.1.html
URL:
http://svn.apache.org/viewvc/helix/site-content/1.0.1-docs/releasenotes/release-1.0.1.html?rev=1880089&r1=1880088&r2=1880089&view=diff
==============================================================================
--- helix/site-content/1.0.1-docs/releasenotes/release-1.0.1.html (original)
+++ helix/site-content/1.0.1-docs/releasenotes/release-1.0.1.html Mon Jul 20
23:54:40 2020
@@ -140,7 +140,7 @@
<!-- http://maven.apache.org/guides/mini/guide-apt-format.html -->
<div class="section">
<div class="page-header">
- <h2 id="Release_Notes_for_Apache_Helix_1.0.1_DEPRECATED">Release Notes for
Apache Helix 1.0.1 (DEPRECATED)</h2>
+ <h2 id="Release_Notes_for_Apache_Helix_1.0.1">Release Notes for Apache Helix
1.0.1</h2>
</div>
<p>The Apache Helix team would like to announce the release of Apache Helix
1.0.1.</p>
<p>This is the tweentieth release under the Apache umbrella, and the
sixteenth as a top-level project.</p>
Added: helix/site-content/1.0.1-docs/tutorial_customized_view.html
URL:
http://svn.apache.org/viewvc/helix/site-content/1.0.1-docs/tutorial_customized_view.html?rev=1880089&view=auto
==============================================================================
--- helix/site-content/1.0.1-docs/tutorial_customized_view.html (added)
+++ helix/site-content/1.0.1-docs/tutorial_customized_view.html Mon Jul 20
23:54:40 2020
@@ -0,0 +1,429 @@
+
+<!DOCTYPE html>
+<!--
+ Generated by Apache Maven Doxia at 2020-07-20
+ Rendered using Maven Reflow Skin 1.0.0
(http://andriusvelykis.github.com/reflow-maven-skin)
+-->
+<html xml:lang="en" lang="en">
+
+ <head>
+ <meta charset="UTF-8" />
+ <title>Apache Helix - Tutorial - Customized View</title>
+ <meta name="viewport" content="width=device-width,
initial-scale=1.0" />
+ <meta name="description" content="" />
+ <meta http-equiv="content-language" content="en" />
+
+ <link href="./css/bootstrap.min.css" rel="stylesheet" />
+ <link href="./css/bootstrap-responsive.min.css"
rel="stylesheet" />
+ <link href="./css/docs.css" rel="stylesheet" />
+ <link href="./css/reflow-skin.css" rel="stylesheet" />
+
+
+ <link href="./css/lightbox.css" rel="stylesheet" />
+
+ <link href="./css/site.css" rel="stylesheet" />
+ <link href="./css/print.css" rel="stylesheet" media="print" />
+
+ <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements -->
+ <!--[if lt IE 9]>
+ <script
src="http://html5shim.googlecode.com/svn/trunk/html5.js";></script>
+ <![endif]-->
+
+<script type="text/javascript">var _gaq = _gaq || [];
+ _gaq.push(['_setAccount', 'UA-3211522-12']);
+ _gaq.push(['_trackPageview']);
+
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+ var ga = document.createElement('script'); ga.type =
'text/javascript'; ga.async = true;
+ ga.src = ('https:' == document.location.protocol ? 'https://ssl' :
'http://www') + '.google-analytics.com/ga.js';
+ var s = document.getElementsByTagName('script')[0];
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+ <body class="page-tutorial_customized_view project-101-docs"
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+ <li><a
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store">Rsync replicated file store </a></li>
+ <li><a
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+ <li><a
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+ </ul>
+ </li>
+ </ul>
+ </div><!--/.nav-collapse -->
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+ </div>
+ </div>
+
+ <div class="container">
+
+ <!-- Masthead
+ ================================================== -->
+ <header class="jumbotron subhead">
+ <div class="row" id="banner">
+ <div class="span12">
+ <div class="pull-left">
+ <a href="../" id="bannerLeft"><img
src="../images/helix-logo.jpg" alt='"''"' /></a>
+ <p class="lead">A cluster management
framework for partitioned and replicated distributed resources</p>
+ </div>
+ <div class="pull-right">
+ <a href="http://www.apache.org/";
id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a>
+ </div>
+ </div>
+ </div>
+ <div>
+ <ul class="breadcrumb">
+ <li><a
href="http://helix.incubator.apache.org/"; title="Apache Helix"
class="externalLink">Apache Helix </a></li>
+ <li class="divider">/</li>
+ <li><a href="../" title="Apache Helix">Apache
Helix </a></li>
+ <li class="divider">/</li>
+ <li><a href="./" title="Release 1.0.1">Release
1.0.1 </a></li>
+ <li class="divider">/</li>
+ <li> Tutorial - Customized View</li>
+ <li class="publishDate version-date
pull-right">Last Published: 2020-07-20</li>
+ </ul>
+ </div>
+ </header>
+
+ <div class="main-body">
+ <div class="row">
+ <div class="span12">
+ <div class="body-content">
+<!-- -
+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. -->
+<p></p>
+<div class="section">
+ <div class="page-header">
+ <h2 id="Helix_Tutorial:_Customized_View"><a href="./Tutorial.html">Helix
Tutorial</a>: Customized View</h2>
+ </div>
+ <p>Helix supports users to define their own per partition states that are
different from the states appeared in the state model. These states are called
customized states. Helix also provides aggregation function for these per
partition states across all participants to facilitate the use of them. The
aggregated customized state result is called customized view. Usually users
would only need to listen on the customized view change to capture customized
state updates. </p>
+ <p>The relationship between customized states and customized view is very
similar to that between current states and external view. Helix controller uses
similar logic to aggregate external view and customized view. But the two views
are designed for different purposes. External view is mainly used to represent
Helix state transition status, while customized view is to record usersâ own
state status. This tutorial provides information for users to get started with
using customized view, which needs more user input than external view.</p>
+ <p>The following figure shows the high level architecture of customized view
aggregation. <img src="./images/CustomizedViewSystemArchitecture.jpeg"
alt="CustomizedViewSystemArchitecture" /></p>
+ <div class="section">
+ <h3 id="Terminologies">Terminologies</h3>
+ <ul>
+ <li>Customized state: A per partition state defined by users in a string
format. Customized state exists under each participant. It may include
different types of states. Each type of state is represented as a Znode itself
and has different resources as its child Znode.</li>
+ <li>Customized state config: A cluster level config specifically used for
customized state related config. For example, it can include a list of
customized states that should be aggregated.</li>
+ <li>Customized view: An aggregation result for customized states across all
participants. It exists under the cluster and can also have a few different
types of states depending on usersâ input. Each type of state is represented
as a Znode itself and has different resources as it child Znode.</li>
+ </ul>
+ </div>
+ <div class="section">
+ <h3 id="How_to_Use_Customized_View">How to Use Customized View</h3>
+ <div class="section">
+ <h4 id="Define_Your_Own_Customized_State">Define Your Own Customized
State</h4>
+ <p>Users are responsible for updating customized states in their
application code. Helix provides a singleton factory called <a
class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/customizedstate/CustomizedStateProviderFactory.java";>Customized
State Provider Factory</a>, and users should instantiate it if they want to
use customized state. </p>
+ <p>After instantiation, users should call the function in the factory with
user defined parameters to build a <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/customizedstate/CustomizedStateProvider.java";>Customized
State Provider</a> object. </p>
+ <p>There are two ways to build <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/customizedstate/CustomizedStateProvider.java";>Customized
State Provider</a>, and the difference is what kind of <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/HelixManager.java";>HelixManager</a>
is passed in. As the following code shows, the first one relies on Helix
provided manager, while the second one needs a user-created Helix manager. </p>
+ <div class="source">
+ <pre> public CustomizedStateProvider buildCustomizedStateProvider(String
instanceName,
+ String clusterName, String zkAddress) {
+ HelixManager helixManager = HelixManagerFactory
+ .getZKHelixManager(clusterName, instanceName,
InstanceType.ADMINISTRATOR, zkAddress);
+ return new CustomizedStateProvider(helixManager, instanceName);
+ }
+
+ public CustomizedStateProvider buildCustomizedStateProvider(HelixManager
helixManager,
+ String instanceName) {
+ return new CustomizedStateProvider(helixManager, instanceName);
+ }
+</pre>
+ </div>
+ <p>Helix provides a a couple of functions in <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/customizedstate/CustomizedStateProvider.java";>Customized
State Provider</a> that handle operations such as update, get, delete, etc.
The underlying logic is already written in an efficient and thread safe way.
Users only need to call these functions to update customized states to
Zookeeper whenever they want.</p>
+ <div class="source">
+ <pre> public void updateCustomizedState(String customizedStateName,
String resourceName,
+ String partitionName, String customizedState);
+
+ public void updateCustomizedState(String customizedStateName, String
resourceName,
+ String partitionName, Map<String, String> customizedStateMap);
+
+ public CustomizedState getCustomizedState(String customizedStateName, String
resourceName);
+
+ public Map<String, String> getPerPartitionCustomizedState(String
customizedStateName,
+ String resourceName, String partitionName);
+
+ public void deletePerPartitionCustomizedState(String customizedStateName,
String resourceName,
+ String partitionName);
+</pre>
+ </div>
+ <p>Here are some additional guidelines about how to use <a
class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/customizedstate/CustomizedStateProvider.java";>Customized
State Provider</a>:</p>
+ <ul>
+ <li> <p>When a user would like to drop a certain instance by calling Helix
delete instance API, Helix will delete the instance as well as all sub-paths
under it with recursive deletion. Therefore, the customized state will also be
deleted, and customized view will be updated when the instance is
gone.</p></li>
+ <li> <p>When a user would like to drop a certain resource by calling Helix
delete resource API, customer will be responsible for deleting customized state
of all partitions for that resource across all instances. This operation can be
implemented in usersâ state transition logic.</p></li>
+ <li> <p>When Helix rebalance happens, and a certain partition on a certain
instance is moved to another instance, customers will need to handle the
cleanup in the callback function currently provided by Helix in the state
transition logic. </p></li>
+ <li> <p>When an unexpected disconnection happened in client side from
Zookeeper, but does not trigger rebalance, Helix will still keep the customized
state as it is and wait for the connection to be reset. </p></li>
+ </ul>
+ </div>
+ <div class="section">
+ <h4 id="Enable_Customized_State_Aggregation_in_Config">Enable Customized
State Aggregation in Config</h4>
+ <p>To use Helix customized state and aggregated view, users should firstly
call a Helix REST API or a Helix java API to set a cluster level config, called
<a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/model/CustomizedStateConfig.java";>Customized
State Config</a>. If users do not config this field properly, they can still
use Helix to record their customized states, but Helix will by default skip the
aggregation process, as the aggregation will take a fair amount of computing
and storage resources. Only when users correctly notify Helix that they want
the aggregation by adding the state type in the aggregation config list field,
Helix will do the aggregation and output the results to Zookeeper.</p>
+ <p>There are two ways to update customized state config. One is through
JAVA API inside <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java";>ZK
Helix Admin</a>, and the other is through REST API in <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/ClusterAccessor.java";>Cluster
Accessor</a>.</p>
+ <p>The JAVA API provides four different functions as follows.</p>
+ <div class="source">
+ <pre> public void addCustomizedStateConfig(String clusterName,
CustomizedStateConfig customizedStateConfig);
+
+ public void removeCustomizedStateConfig(String clusterName);
+
+ public void addTypeToCustomizedStateConfig(String clusterName, String type);
+
+ public void removeTypeFromCustomizedStateConfig(String clusterName, String
type);
+</pre>
+ </div>
+ <p>Every JAVA API has a corresponding REST API. For example, the function
<tt>addCustomizedStateConfig</tt> can be performed by the following REST
call.</p>
+ <div class="source">
+ <pre> $curl -X PUT -H "Content-Type: application/json"
http://localhost:1234/admin/v2/clusters/myCluster/customized-state-config -d '
+ {
+ "id" : "CustomizedStateConfig",
+ "listFields" : {
+ "AGGREGATION_ENABLED_TYPES" :
["CUSTOMIZED_STATE_TYPE_0", "CUSTOMIZED_STATE_TYPE_1""]
+ },
+ "simpleFields" : {
+ },
+ "mapFields" : {
+ }
+ }'
+</pre>
+ </div>
+ </div>
+ <div class="section">
+ <h4 id="Update_Consuming_Logic_to_Listen_on_Customized_View_Change">Update
Consuming Logic to Listen on Customized View Change</h4>
+ <p>The aggregated results is updated in <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/spectator/RoutingTableProvider.java";>RoutingTableProvider</a>.
Users need to properly construct the routing table provider in their consuming
logic to use the snapshot that contains customized view. <a
class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/spectator/RoutingTableProvider.java";>RoutingTableProvider</a>
has three different constructors for backward compatibility.</p>
+ <div class="source">
+ <pre> public RoutingTableProvider(HelixManager helixManager) throws
HelixException {
+ this(helixManager, ImmutableMap.of(PropertyType.EXTERNALVIEW,
Collections.emptyList()), true,
+ DEFAULT_PERIODIC_REFRESH_INTERVAL);
+ }
+
+ public RoutingTableProvider(HelixManager helixManager, PropertyType
sourceDataType)
+ throws HelixException {
+ this(helixManager, ImmutableMap.of(sourceDataType,
Collections.emptyList()), true,
+ DEFAULT_PERIODIC_REFRESH_INTERVAL);
+ }
+
+ public RoutingTableProvider(HelixManager helixManager, Map<PropertyType,
List<String>> sourceDataTypeMap) {
+ this(helixManager, sourceDataTypeMap, true,
DEFAULT_PERIODIC_REFRESH_INTERVAL);
+ }
+</pre>
+ </div>
+ <p>If users would like to use customized states and customized view, they
need to initialize <a class="externalLink"
href="https://github.com/apache/helix/blob/master/helix-core/src/main/java/org/apache/helix/spectator/RoutingTableProvider.java";>RoutingTableProvider</a>
with the last constructor. They also need to define the
<tt>sourceDataMap</tt>. For example, if users would like to listen to both
external view and customized view, they can do </p>
+ <div class="source">
+ <pre>Map<PropertyType, List<String>> sourceDataTypeMap = new
Hashmap<>();
+sourceDataTypeMap.put(PropertyType.CUSTOMIZEDVIEW,
Arrays.asList(CUSTOMIZED_STATE_0, CUSTOMIZED_STATE_1))
+sourceDataTypeMap.put(PropertyType.EXTERNALVIEW, Collections.emptyList());
+
+routingTableProvider = new RoutingTableProvider(helixManager,
sourceDataTypeMap);
+</pre>
+ </div>
+ </div>
+ <div class="section">
+ <h4 id="Verify_Customized_View_Generated_Properly">Verify Customized View
Generated Properly</h4>
+ <p>After finishing all the steps above, users could verify whether the
customized view is generated probably based on customized states. For example,
if you have two instances: P0 and P1, one resource: MyResource, with two
partitions: MyResource_0 and MyResource_1, and each partition has one state in
CUSTOMIZED_STATE_TYPE_1, which includes STATE_NAME_0, STATE_NAME_1 and
STATE_NAME_2. At a certain time, the customized states may look like something
similar to the following.</p>
+ <div class="source">
+ <pre>P0:
+{
+ "id": "MyResource",
+ "listFields": {},
+ "mapFields": {
+ "MyResource_0": {
+ "CURRENT_STATE": "STATE_NAME_1",
+ "PREVIOUS_STATE": "STATE_NAME_0",
+ "START_TIME": "1580221789100",
+ "END_TIME": "1580221835197",
+ },
+ "MyResource_1": {
+ "CURRENT_STATE": "STATE_NAME_2",
+ "PREVIOUS_STATE": "STATE_NAME1",
+ "START_TIME": "1580221789880",
+ "END_TIME": "1580221835117"
+ }
+ }
+}
+
+P1:
+{
+ "id": "MyResource",
+ "listFields": {},
+ "mapFields": {
+ "MyResource_0": {
+ "CURRENT_STATE": "STATE_NAME_2",
+ "PREVIOUS_STATE": "STATE_NAME_0",
+ "START_TIME": "1570221125566",
+ "END_TIME": "15744432835197",
+ },
+ "MyResource_1": {
+ "CURRENT_STATE": "STATE_NAME_0",
+ "PREVIOUS_STATE": "STATE_NAME1",
+ "START_TIME": "1570221723440",
+ "END_TIME": "1570321835117"
+ }
+ }
+}
+</pre>
+ </div>
+ <p>After Helix controller aggregation, the customized view should look like
the following:</p>
+ <div class="source">
+ <pre>{ "id": "MyResource",
+ "listFields": {},
+ "mapFields": {
+ "MyResource_0": {
+ "P0": "STATE_NAME_1",
+ "P1": "STATE_NAME_2"
+ },
+ "MyResource_1": {
+ "P0": "STATE_NAME_2",
+ "P1": "STATE_NAME_0"
+ }
+}
+</pre>
+ </div>
+ </div>
+ </div>
+</div>
+ </div>
+ </div>
+ </div>
+ </div>
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