Modified: helix/site-content/Architecture.html URL: http://svn.apache.org/viewvc/helix/site-content/Architecture.html?rev=1899878&r1=1899877&r2=1899878&view=diff ============================================================================== --- helix/site-content/Architecture.html (original) +++ helix/site-content/Architecture.html Fri Apr 15 06:54:11 2022 @@ -1,20 +1,19 @@ <!DOCTYPE html> <!-- - Generated by Apache Maven Doxia at 2021-11-21 + Generated by Apache Maven Doxia at 2022-04-15 Rendered using Reflow Maven Skin 1.1.1 (http://andriusvelykis.github.io/reflow-maven-skin) --> <html xml:lang="en" lang="en"> <head> <meta charset="UTF-8" /> - <title>Apache Helix - Architecture</title> + <title>Apache Helix – Architecture</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="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap.min.css"; rel="stylesheet" /> <link href="./css/docs.css" rel="stylesheet" /> <link href="./css/reflow-skin.css" rel="stylesheet" /> @@ -26,23 +25,14 @@ <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements --> <!--[if lt IE 9]> - <script src="./js/html5.js"></script> + <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']); - - (function() { - var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; - ga.src = ('https:' == document.location.protocol ? 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<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> + <a href="" id="bannerLeft"><img src="" alt='"''"' /></a> </div> <div class="pull-right"> - <a href="http://www.apache.org/"; id="bannerRight"><img src="images/feather_small.gif" alt='"''"' /></a> + <a href="http://www.apache.org/"; id="bannerRight"><img src="" alt='"''"' /></a> </div> </div> </div> </div> <div> <ul class="breadcrumb"> - <li><a href="./" title="Apache Helix">Apache Helix</a></li> + <li><a href="" title="Apache Helix">Apache Helix</a></li> <li class="divider">/</li> - <li> Architecture</li> + <li>Architecture</li> </ul> </div> </header> @@ -163,257 +140,7 @@ <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="Architecture">Architecture</h2> - </div> - <p>Helix aims to provide the following abilities to a distributed system:</p> - <ul> - <li>Automatic management of a cluster hosting partitioned, replicated resources</li> - <li>Soft and hard failure detection and handling</li> - <li>Automatic load balancing via smart placement of resources on servers (nodes) based on server capacity and resource profile (size of partitions, access patterns, etc)</li> - <li>Centralized config management and self discovery, eliminating the need to modify config on each node</li> - <li>Fault tolerance and optimized rebalancing during cluster expansion</li> - <li>Management of the entire operational lifecycle of a node. Add, start, stop, enable, and disable without downtime</li> - <li>Monitoring of cluster health and alerting on SLA violations</li> - <li>A service discovery mechanism to route requests</li> - </ul> - <p>To build such a system, we need a mechanism to coordinate between different nodes and other components in the system. This mechanism can be achieved with software that reacts to any change in the cluster and comes up with a set of tasks needed to bring the cluster to a stable state. The set of tasks will be assigned to one or more nodes in the cluster. Helix serves this purpose of managing the various components in the cluster.</p> - <p><img src="images/system.png" alt="Helix Design" /></p> -</div> -<div class="section"> - <h2 id="Distributed_System_Components">Distributed System Components</h2> - <p>In general any distributed system cluster will have the following components and properties:</p> - <ul> - <li>A set of nodes also referred to as <b>instances</b></li> - <li>A set of <b>resources</b> which can be databases, lucene indexes or tasks</li> - <li>Subdivisions of each resource into one or more <b>partitions</b></li> - <li>Copies of each resource called <b>replicas</b></li> - <li>The <b>state</b> of each replica, e.g. Master, Slave, Leader, Standby, Online, Offline, etc.</li> - </ul> -</div> -<div class="section"> - <h2 id="Roles">Roles</h2> - <p><img src="images/HELIX-components.png" alt="Helix Design" /></p> - <p>Not all nodes in a distributed system will perform similar functionalities. For example, a few nodes might be serving requests and a few nodes might be sending requests, and some other nodes might be controlling the nodes in the cluster. Thus, Helix categorizes nodes by their specific roles in the system.</p> - <p>Helix divides nodes into 3 logical components based on their responsibilities:</p> - <ol style="list-style-type: decimal"> - <li><b>Participant</b>: The nodes that actually host the distributed resources</li> - <li><b>Spectator</b>: The nodes that simply observe the current state of each Participant and routes requests accordingly. Routers, for example, need to know the instance on which a partition is hosted and its state in order to route the request to the appropriate endpoint</li> - <li><b>Controller</b>: The node that observes and controls the Participant nodes. It is responsible for coordinating all transitions in the cluster and ensuring that state constraints are satisfied while maintaining cluster stability</li> - </ol> - <p>These are simply logical components and can be deployed according to system requirements. For example, the Controller:</p> - <ol style="list-style-type: decimal"> - <li>can be deployed as a separate service</li> - <li>can be deployed along with a Participant but only one Controller will be active at any given time.</li> - </ol> - <p>Both have pros and cons, which will be discussed later and one can chose the mode of deployment as per system needs.</p> -</div> -<div class="section"> - <h2 id="Cluster_State_Metadata_Store">Cluster State Metadata Store</h2> - <p>We need a distributed store to maintain the state of the cluster and a notification system to notify if there is any change in the cluster state. Helix uses <a class="externalLink" href="http://zookeeper.apache.org";>Apache ZooKeeper</a> to achieve this functionality.</p> - <p>Zookeeper provides:</p> - <ul> - <li>A way to represent PERSISTENT state which remains until its deleted</li> - <li>A way to represent TRANSIENT/EPHEMERAL state which vanishes when the process that created the state dies</li> - <li>A notification mechanism when there is a change in PERSISTENT and EPHEMERAL state</li> - </ul> - <p>The namespace provided by ZooKeeper is much like that of a standard file system. A name is a sequence of path elements separated by a slash (/). Every node (ZNode) in ZooKeeper's namespace is identified by a path.</p> - <p>More info on Zookeeper can be found at <a class="externalLink" href="http://zookeeper.apache.org";>http://zookeeper.apache.org</a></p> -</div> -<div class="section"> - <h2 id="State_Machine_and_Constraints">State Machine and Constraints</h2> - <p>Even though the concepts of Resources, Partitions, and Replicas are common to most distributed systems, one thing that differentiates one distributed system from another is the way each partition is assigned a state and the constraints on each state.</p> - <p>For example:</p> - <ol style="list-style-type: decimal"> - <li>If a system is serving read-only data then all of a partition's replicas are equivalent and they can either be ONLINE or OFFLINE.</li> - <li>If a system takes <i>both</i> reads and writes but must ensure that writes go through only one partition, the states will be MASTER, SLAVE, and OFFLINE. Writes go through the MASTER and replicate to the SLAVEs. Optionally, reads can go through SLAVEs.</li> - </ol> - <p>Apart from defining the state for each partition, the transition path between states can be application specific. For example, in order to become MASTER it might be a requirement to first become a SLAVE. This ensures that if the SLAVE does not have the data as part of OFFLINE-SLAVE transition it can bootstrap data from other nodes in the system.</p> - <p>Helix provides a way to configure an application-specific state machine along with constraints on each state. Along with constraints on STATE, Helix also provides a way to specify constraints on transitions. (More on this later.)</p> - <div class="source"> - <pre> OFFLINE | SLAVE | MASTER - _____________________________ - | | | | -OFFLINE | N/A | SLAVE | SLAVE | - |__________|________|_________| - | | | | -SLAVE | OFFLINE | N/A | MASTER | - |__________|________|_________| - | | | | -MASTER | SLAVE | SLAVE | N/A | - |__________|________|_________| - -</pre> - </div> - <p><img src="images/statemachine.png" alt="Helix Design" /></p> -</div> -<div class="section"> - <h2 id="Concepts">Concepts</h2> - <p>The following terminologies are used in Helix to model resources following a state machine.</p> - <ul> - <li><b>IdealState</b>: The state in which we need the cluster to be in if all nodes are up and running. In other words, all state constraints are satisfied.</li> - <li><b>CurrentState</b>: The actual current state of each node in the cluster</li> - <li><b>ExternalView</b>: The combined view of the CurrentState of all nodes.</li> - </ul> - <p>The goal of Helix is always to make the CurrentState (and by extension, the ExternalView) of the system same as the IdealState. Some scenarios where this may not be true are:</p> - <ul> - <li>Some or all nodes are down</li> - <li>One or more nodes fail</li> - <li>New nodes are added and the partitions need to be reassigned</li> - </ul> - <div class="section"> - <h3 id="IdealState">IdealState</h3> - <p>Helix lets the application define the IdealState for each resource. It consists of:</p> - <ul> - <li>A list of partitions, e.g. 64</li> - <li>Number of replicas for each partition, e.g. 3</li> - <li>The assigned node and state for each replica</li> - </ul> - <p>Example:</p> - <ul> - <li>Partition-1, replica-1: Master, Node-1</li> - <li>Partition-1, replica-2: Slave, Node-2</li> - <li>Partition-1, replica-3: Slave, Node-3</li> - <li>â¦..</li> - <li>â¦..</li> - <li>Partition-p, replica-r: Slave, Node-n</li> - </ul> - <p>Helix comes with various algorithms to automatically assign the partitions to nodes. The default algorithm minimizes the number of shuffles that happen when new nodes are added to the system.</p> - </div> - <div class="section"> - <h3 id="CurrentState">CurrentState</h3> - <p>Every participant in the cluster hosts one or more partitions of a resource. Each of the partitions has a state associated with it.</p> - <p>Example Node-1</p> - <ul> - <li>Partition-1, Master</li> - <li>Partition-2, Slave</li> - <li>â¦.</li> - <li>â¦.</li> - <li>Partition-p, Slave</li> - </ul> - </div> - <div class="section"> - <h3 id="ExternalView">ExternalView</h3> - <p>External clients needs to know the state of each partition in the cluster and the Node hosting that partition. Helix provides one view of the system to Spectators as the ExternalView. The ExternalView is simply an aggregate of all node CurrentStates.</p> - <ul> - <li>Partition-1, replica-1, Master, Node-1</li> - <li>Partition-1, replica-2, Slave, Node-2</li> - <li>Partition-1, replica-3, Slave, Node-3</li> - <li>â¦..</li> - <li>â¦..</li> - <li>Partition-p, replica-3, Slave, Node-n</li> - </ul> - </div> -</div> -<div class="section"> - <h2 id="Process_Workflow">Process Workflow</h2> - <p>Mode of operation in a cluster</p> - <p>A node process can be one of the following:</p> - <ul> - <li>Participant: The process registers itself in the cluster and acts on the messages received in its queue and updates the current state. Example: a storage node in a distributed database</li> - <li>Spectator: The process is simply interested in the changes in the ExternalView.</li> - <li>Controller: This process actively controls the cluster by reacting to changes in cluster state and sending state transition messages to Participants.</li> - </ul> - <div class="section"> - <h3 id="Participant_Node_Process">Participant Node Process</h3> - <ul> - <li>When the Participant starts up, it registers itself under <b>LiveInstances</b></li> - <li>After registering, it waits for new <b>messages</b> in the message queue</li> - <li>When it receives a message, it will perform the required task as indicated in the message</li> - <li>After the task is completed, depending on the task outcome it updates the CurrentState</li> - </ul> - </div> - <div class="section"> - <h3 id="Controller_Process">Controller Process</h3> - <ul> - <li>Watches IdealState</li> - <li>Notified when a Participant goes down, comes up, is added, or is removed. Watches the ephemeral LiveInstance ZNode and the CurrentState of each Participant in the cluster</li> - <li>Triggers appropriate state transitions by sending messages to Participants</li> - </ul> - </div> - <div class="section"> - <h3 id="Spectator_Process">Spectator Process</h3> - <ul> - <li>When the process starts, it asks the Helix agent to be notified of changes in ExternalView</li> - <li>Whenever it receives a notification, it reads the ExternalView and performs required duties</li> - </ul> - </div> - <div class="section"> - <h3 id="Interaction_between_the_Controller_Participant_and_Spectator">Interaction between the Controller, Participant and Spectator</h3> - <p>The following picture shows how Controllers, Participants and Spectators interact with each other.</p> - <p><img src="images/helix-architecture.png" alt="Helix Architecture" /></p> - </div> -</div> -<div class="section"> - <h2 id="Core_Controller_Algorithm">Core Controller Algorithm</h2> - <ul> - <li>Get the IdealState and the CurrentState of active storage nodes from ZooKeeper</li> - <li>Compute the delta between IdealState and CurrentState for each partition replica across all Participant nodes</li> - <li>For each partition compute tasks based on the State Machine Table. It's possible to configure priority on the state Transition. For example, in case of MasterSlave: - <ul> - <li>Attempt mastership transfer if possible without violating constraints</li> - <li>Partition addition</li> - <li>Partition drop</li> - </ul></li> - <li>Add the transition tasks in parallel if possible to the respective queue for each storage node (if the tasks added are mutually independent)</li> - <li>If a transition task is dependent on another task being completed, do not add that task</li> - <li>After any task is completed by a Participant, Controllers gets notified of the change and the algorithm is re-run until the CurrentState matches the IdealState.</li> - </ul> -</div> -<div class="section"> - <h2 id="Helix_ZNode_Layout">Helix ZNode Layout</h2> - <p>Helix organizes ZNodes under the cluster name in multiple levels.</p> - <p>The top level (under the cluster name) ZNodes are all Helix-defined and in upper case:</p> - <ul> - <li>PROPERTYSTORE: application property store</li> - <li>STATEMODELDEFES: state model definitions</li> - <li>INSTANCES: instance runtime information including current state and messages</li> - <li>CONFIGS: configurations</li> - <li>IDEALSTATES: ideal states</li> - <li>EXTERNALVIEW: external views</li> - <li>LIVEINSTANCES: live instances</li> - <li>CONTROLLER: cluster controller runtime information</li> - </ul> - <p>Under INSTANCES, there are runtime ZNodes for each instance. An instance organizes ZNodes as follows:</p> - <ul> - <li>CURRENTSTATES - <ul> - <li>sessionId</li> - <li>resourceName</li> - </ul></li> - <li>ERRORS</li> - <li>STATUSUPDATES</li> - <li>MESSAGES</li> - <li>HEALTHREPORT</li> - </ul> - <p>Under CONFIGS, there are different scopes of configurations:</p> - <ul> - <li>RESOURCE: contains resource scope configurations</li> - <li>CLUSTER: contains cluster scope configurations</li> - <li>PARTICIPANT: contains participant scope configurations</li> - </ul> - <p>The following image shows an example of the Helix ZNode layout for a cluster named âtest-clusterâ:</p> - <p><img src="images/helix-znode-layout.png" alt="Helix znode layout" /></p> -</div> +$bodyWithHeader </div> </div> </div> @@ -426,145 +153,100 @@ MASTER | SLAVE | SLAVE | N/A | <footer class="well"> <div class="container"> <div class="row"> - <div class="span2 bottom-nav"> + <div class="span9 bottom-nav"> <ul class="nav nav-list"> <li class="nav-header">Learn</li> - <li > - <a href="Concepts.html" title="Core Concepts">Core Concepts</a> + <li class="active"> + <a href="#" title="Core Concepts">Core Concepts</a> </li> <li class="active"> <a href="#" title="Architecture">Architecture</a> </li> - 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Modified: helix/site-content/ClientLibraries.html URL: http://svn.apache.org/viewvc/helix/site-content/ClientLibraries.html?rev=1899878&r1=1899877&r2=1899878&view=diff ============================================================================== --- helix/site-content/ClientLibraries.html (original) +++ helix/site-content/ClientLibraries.html Fri Apr 15 06:54:11 2022 @@ -1,20 +1,19 @@ <!DOCTYPE html> <!-- - Generated by Apache Maven Doxia at 2021-11-21 + Generated by Apache Maven Doxia at 2022-04-15 Rendered using Reflow Maven Skin 1.1.1 (http://andriusvelykis.github.io/reflow-maven-skin) --> <html xml:lang="en" lang="en"> <head> <meta charset="UTF-8" /> - <title>Apache Helix - Client Libraries</title> + <title>Apache Helix – Client Libraries</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="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap.min.css"; rel="stylesheet" /> <link href="./css/docs.css" rel="stylesheet" /> <link href="./css/reflow-skin.css" rel="stylesheet" /> @@ -26,23 +25,14 @@ <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements --> <!--[if lt IE 9]> - <script src="./js/html5.js"></script> + <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']); - - (function() { - var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; - ga.src = ('https:' == document.location.protocol ? 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<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> + <a href="" id="bannerLeft"><img src="" alt='"''"' /></a> </div> <div class="pull-right"> - <a href="http://www.apache.org/"; id="bannerRight"><img src="images/feather_small.gif" alt='"''"' /></a> + <a href="http://www.apache.org/"; id="bannerRight"><img src="" alt='"''"' /></a> </div> </div> </div> </div> <div> <ul class="breadcrumb"> - <li><a href="./" title="Apache Helix">Apache Helix</a></li> + <li><a href="" title="Apache Helix">Apache Helix</a></li> <li class="divider">/</li> - <li> Client Libraries</li> + <li>Client Libraries</li> </ul> </div> </header> @@ -163,48 +140,7 @@ <div class="row"> <div class="span12"> <div class="body-content"> -<!-- - -Licensed to the Apache Software Foundation (ASF) under one -or more contributor license agreements. 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<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> + <a href="" id="bannerLeft"><img src="" alt='"''"' /></a> </div> <div class="pull-right"> - <a href="http://www.apache.org/"; id="bannerRight"><img src="images/feather_small.gif" alt='"''"' /></a> + <a href="http://www.apache.org/"; id="bannerRight"><img src="" alt='"''"' /></a> </div> </div> </div> </div> <div> <ul class="breadcrumb"> - <li><a href="./" title="Apache Helix">Apache Helix</a></li> + <li><a href="" title="Apache Helix">Apache Helix</a></li> <li class="divider">/</li> - <li> Concepts</li> + <li>Concepts</li> </ul> </div> </header> @@ -163,264 +140,7 @@ <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="Concepts">Concepts</h2> - </div> - <p>Helix is based on the idea that a given task has the following attributes associated with it:</p> - <ul> - <li><b>Location</b>, e.g. it is available on Node N1</li> - <li><b>State</b>, e.g. it is running, stopped etc.</li> - </ul> - <p>In Helix terminology, a task is referred to as a <b>resource</b>.</p> - <div class="section"> - <h3 id="Ideal_State">Ideal State</h3> - <p>An <b>IdealState</b> allows one to map tasks to location and state. A standard way of expressing this in Helix is as follows:</p> - <div class="source"> - <pre>"TASK_NAME" : { - "LOCATION" : "STATE" -} -</pre> - </div> - <p>Consider a simple case where you want to launch a resource "myTask" on node "N1". The IdealState for this can be expressed as follows:</p> - <div class="source"> - <pre>{ - "id" : "MyTask", - "mapFields" : { - "myTask" : { - "N1" : "ONLINE", - } - } -} -</pre> - </div> - </div> - <div class="section"> - <h3 id="Partition">Partition</h3> - <p>If this task get too big to fit on one box, you might want to divide it into subtasks. Each subtask is referred to as a <b>partition</b> in Helix. Let's say you want to divide the task into 3 subtasks/partitions, the IdealState can be changed as shown below.</p> - <p>"myTask_0", "myTask_1", "myTask_2" are logical names representing the partitions of myTask. Each tasks runs on N1, N2 and N3 respectively.</p> - <div class="source"> - <pre>{ - "id" : "myTask", - "simpleFields" : { - "NUM_PARTITIONS" : "3", - } - "mapFields" : { - "myTask_0" : { - "N1" : "ONLINE", - }, - "myTask_1" : { - "N2" : "ONLINE", - }, - "myTask_2" : { - "N3" : "ONLINE", - } - } -} -</pre> - </div> - </div> - <div class="section"> - <h3 id="Replica">Replica</h3> - <p>Partitioning allows one to split the data/task into multiple subparts. But let's say the request rate for each partition increases. The common solution is to have multiple copies for each partition. Helix refers to the copy of a partition as a <b>replica</b>. Adding a replica also increases the availability of the system during failures. One can see this methodology employed often in search systems. The index is divided into shards, and each shard has multiple copies.</p> - <p>Let's say you want to add one additional replica for each task. The IdealState can simply be changed as shown below.</p> - <p>For increasing the availability of the system, it's better to place the replica of a given partition on different nodes.</p> - <div class="source"> - <pre>{ - "id" : "myIndex", - "simpleFields" : { - "NUM_PARTITIONS" : "3", - "REPLICAS" : "2", - }, - "mapFields" : { - "myIndex_0" : { - "N1" : "ONLINE", - "N2" : "ONLINE" - }, - "myIndex_1" : { - "N2" : "ONLINE", - "N3" : "ONLINE" - }, - "myIndex_2" : { - "N3" : "ONLINE", - "N1" : "ONLINE" - } - } -} -</pre> - </div> - </div> - <div class="section"> - <h3 id="State">State</h3> - <p>Now let's take a slightly more complicated scenario where a task represents a database. Unlike an index which is in general read-only, a database supports both reads and writes. Keeping the data consistent among the replicas is crucial in distributed data stores. One commonly applied technique is to assign one replica as the MASTER and remaining replicas as SLAVEs. All writes go to the MASTER and are then replicated to the SLAVE replicas.</p> - <p>Helix allows one to assign different <b>states</b> to each replica. Let's say you have two MySQL instances N1 and N2, where one will serve as MASTER and another as SLAVE. The IdealState can be changed to:</p> - <div class="source"> - <pre>{ - "id" : "myDB", - "simpleFields" : { - "NUM_PARTITIONS" : "1", - "REPLICAS" : "2", - }, - "mapFields" : { - "myDB" : { - "N1" : "MASTER", - "N2" : "SLAVE", - } - } -} -</pre> - </div> - </div> - <div class="section"> - <h3 id="State_Machine_and_Transitions">State Machine and Transitions</h3> - <p>The IdealState allows one to exactly specify the desired state of the cluster. Given an IdealState, Helix takes up the responsibility of ensuring that the cluster reaches the IdealState. The Helix <b>controller</b> reads the IdealState and then commands each Participant to take appropriate actions to move from one state to another until it matches the IdealState. These actions are referred to as <b>transitions</b> in Helix.</p> - <p>The next logical question is: how does the controller compute the transitions required to get to IdealState? This is where the <b>finite state machine</b> concept comes in. Helix allows applications to plug in a finite state machine. A state machine consists of the following:</p> - <ul> - <li><b>State</b>: Describes the role of a replica</li> - <li><b>Transition</b>: An action that allows a replica to move from one state to another, thus changing its role.</li> - </ul> - <p>Here is an example of MasterSlave state machine:</p> - <div class="source"> - <pre> OFFLINE | SLAVE | MASTER - _____________________________ - | | | | -OFFLINE | N/A | SLAVE | SLAVE | - |__________|________|_________| - | | | | -SLAVE | OFFLINE | N/A | MASTER | - |__________|________|_________| - | | | | -MASTER | SLAVE | SLAVE | N/A | - |__________|________|_________| - -</pre> - </div> - <p>Helix allows each resource to be associated with one state machine. This means you can have one resource as an index and another as a database in the same cluster. One can associate each resource with a state machine as follows:</p> - <div class="source"> - <pre>{ - "id" : "myDB", - "simpleFields" : { - "NUM_PARTITIONS" : "1", - "REPLICAS" : "2", - "STATE_MODEL_DEF_REF" : "MasterSlave", - }, - "mapFields" : { - "myDB" : { - "N1" : "MASTER", - "N2" : "SLAVE", - } - } -} - -</pre> - </div> - </div> - <div class="section"> - <h3 id="Current_State">Current State</h3> - <p>The <b>CurrentState</b> of a resource simply represents its actual state at a participating node, a <b>participant</b>. In the below example:</p> - <ul> - <li>INSTANCE_NAME: Unique name representing the process</li> - <li>SESSION_ID: ID that is automatically assigned every time a process joins the cluster</li> - </ul> - <div class="source"> - <pre>{ - "id":"MyResource" - ,"simpleFields":{ - ,"SESSION_ID":"13d0e34675e0002" - ,"INSTANCE_NAME":"node1" - ,"STATE_MODEL_DEF":"MasterSlave" - } - ,"mapFields":{ - "MyResource_0":{ - "CURRENT_STATE":"SLAVE" - } - ,"MyResource_1":{ - "CURRENT_STATE":"MASTER" - } - ,"MyResource_2":{ - "CURRENT_STATE":"MASTER" - } - } -} -</pre> - </div> - <p>Each node in the cluster has its own CurrentState.</p> - </div> - <div class="section"> - <h3 id="External_View">External View</h3> - <p>In order to communicate with the participants, external clients need to know the current state of each of the participants. The external clients are referred to as <b>spectators</b>. In order to make the life of spectator simple, Helix provides an ExternalView that is an aggregated view of the current state across all nodes. The ExternalView has a similar format as IdealState.</p> - <div class="source"> - <pre>{ - "id":"MyResource", - "mapFields":{ - "MyResource_0":{ - "N1":"SLAVE", - "N2":"MASTER", - "N3":"OFFLINE" - }, - "MyResource_1":{ - "N1":"MASTER", - "N2":"SLAVE", - "N3":"ERROR" - }, - "MyResource_2":{ - "N1":"MASTER", - "N2":"SLAVE", - "N3":"SLAVE" - } - } -} -</pre> - </div> - </div> - <div class="section"> - <h3 id="Rebalancer">Rebalancer</h3> - <p>The core component of Helix is the Controller which runs the Rebalancer algorithm on every cluster event. Cluster events can be one of the following:</p> - <ul> - <li>Nodes start and/or stop</li> - <li>Nodes experience soft and/or hard failures</li> - <li>New nodes are added/removed</li> - <li>Ideal state changes</li> - </ul> - <p>There are few more examples such as configuration changes, etc. The key takeaway: there are many ways to trigger the rebalancer.</p> - <p>When a rebalancer is run it simply does the following:</p> - <ul> - <li>Compares the ideal state and current state</li> - <li>Computes the transitions required to reach the ideal state</li> - <li>Issues the transitions to each participant</li> - </ul> - <p>The above steps happen for every change in the system. Once the current state matches the IdealState, the system is considered stable which implies 'IdealState = CurrentState = ExternalView'</p> - </div> - <div class="section"> - <h3 id="Dynamic_IdealState">Dynamic IdealState</h3> - <p>One of the things that makes Helix powerful is that IdealState can be changed dynamically. This means one can listen to cluster events like node failures and dynamically change the ideal state. Helix will then take care of triggering the respective transitions in the system.</p> - <p>Helix allows various granularities of control for adjusting the ideal state. Whenever a cluster event occurs, Helix can operate in one of three modes:</p> - <ul> - <li><b>FULL_AUTO</b>: Helix will automatically determine the location and state of each replica based on constraints</li> - <li><b>SEMI_AUTO</b>: Helix will take in a "preference list" representing the location each replica can live at, and automatically determine the state based on constraints</li> - <li><b>CUSTOMIZED</b>: Helix will take in a map of location to state and fire transitions to get the external view to match</li> - </ul> - <p>Helix comes with a few algorithms to automatically compute the IdealState based on the constraints. For example, if you have a resource of 3 partitions and 2 replicas, Helix can automatically compute the IdealState based on the nodes that are currently active. See the <a href="./0.6.4-docs/tutorial_rebalance.html">tutorial</a> to find out more about various execution modes of Helix like FULL_AUTO, SEMI_AUTO and CUSTOMIZED.</p> - </div> -</div> +$bodyWithHeader </div> </div> </div> @@ -433,145 +153,100 @@ MASTER | SLAVE | SLAVE | N/A | <footer class="well"> <div class="container"> <div class="row"> - <div class="span2 bottom-nav"> + <div class="span9 bottom-nav"> <ul class="nav nav-list"> <li class="nav-header">Learn</li> <li class="active"> <a href="#" title="Core Concepts">Core Concepts</a> </li> - <li > - <a href="Architecture.html" title="Architecture">Architecture</a> + <li class="active"> + <a href="#" title="Architecture">Architecture</a> </li> - <li > - <a href="Publications.html" title="Publications">Publications</a> + <li class="active"> + <a href="#" title="Publications">Publications</a> </li> - <li > - <a href="ClientLibraries.html" title="Client Libraries">Client Libraries</a> + <li class="active"> + <a href="#" title="Client Libraries">Client Libraries</a> </li> - 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