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From kisho...@apache.org
Subject [35/52] [abbrv] [HELIX-270] Include documentation for previous version on the website
Date Wed, 20 Nov 2013 21:12:50 GMT
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_admin.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Admin Operations</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Admin Operations
+
+Helix provides a set of admin api for cluster management operations. They are supported via:
+
+* _Java API_
+* _Commandline interface_
+* _REST interface via helix-admin-webapp_
+
+### Java API
+See interface [_org.apache.helix.HelixAdmin_](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/HelixAdmin.html)
+
+### Command-line interface
+The command-line tool comes with helix-core package:
+
+Get the command-line tool:
+
+``` 
+  - git clone https://git-wip-us.apache.org/repos/asf/incubator-helix.git
+  - cd incubator-helix
+  - ./build
+  - cd helix-core/target/helix-core-pkg/bin
+  - chmod +x *.sh
+```
+
+Get help:
+
+```
+  - ./helix-admin.sh --help
+```
+
+All other commands have this form:
+
+```
+  ./helix-admin.sh --zkSvr <ZookeeperServerAddress> <command> <parameters>
+```
+
+Admin commands and brief description:
+
+| Command syntax | Description |
+| -------------- | ----------- |
+| _\-\-activateCluster \<clusterName controllerCluster true/false\>_ | Enable/disable a cluster in distributed controller mode |
+| _\-\-addCluster \<clusterName\>_ | Add a new cluster |
+| _\-\-addIdealState \<clusterName resourceName fileName.json\>_ | Add an ideal state to a cluster |
+| _\-\-addInstanceTag \<clusterName instanceName tag\>_ | Add a tag to an instance |
+| _\-\-addNode \<clusterName instanceId\>_ | Add an instance to a cluster |
+| _\-\-addResource \<clusterName resourceName partitionNumber stateModelName\>_ | Add a new resource to a cluster |
+| _\-\-addResourceProperty \<clusterName resourceName propertyName propertyValue\>_ | Add a resource property |
+| _\-\-addStateModelDef \<clusterName fileName.json\>_ | Add a State model definition to a cluster |
+| _\-\-dropCluster \<clusterName\>_ | Delete a cluster |
+| _\-\-dropNode \<clusterName instanceId\>_ | Remove a node from a cluster |
+| _\-\-dropResource \<clusterName resourceName\>_ | Remove an existing resource from a cluster |
+| _\-\-enableCluster \<clusterName true/false\>_ | Enable/disable a cluster |
+| _\-\-enableInstance \<clusterName instanceId true/false\>_ | Enable/disable an instance |
+| _\-\-enablePartition \<true/false clusterName nodeId resourceName partitionName\>_ | Enable/disable a partition |
+| _\-\-getConfig \<configScope configScopeArgs configKeys\>_ | Get user configs |
+| _\-\-getConstraints \<clusterName constraintType\>_ | Get constraints |
+| _\-\-help_ | print help information |
+| _\-\-instanceGroupTag \<instanceTag\>_ | Specify instance group tag, used with rebalance command |
+| _\-\-listClusterInfo \<clusterName\>_ | Show information of a cluster |
+| _\-\-listClusters_ | List all clusters |
+| _\-\-listInstanceInfo \<clusterName instanceId\>_ | Show information of an instance |
+| _\-\-listInstances \<clusterName\>_ | List all instances in a cluster |
+| _\-\-listPartitionInfo \<clusterName resourceName partitionName\>_ | Show information of a partition |
+| _\-\-listResourceInfo \<clusterName resourceName\>_ | Show information of a resource |
+| _\-\-listResources \<clusterName\>_ | List all resources in a cluster |
+| _\-\-listStateModel \<clusterName stateModelName\>_ | Show information of a state model |
+| _\-\-listStateModels \<clusterName\>_ | List all state models in a cluster |
+| _\-\-maxPartitionsPerNode \<maxPartitionsPerNode\>_ | Specify the max partitions per instance, used with addResourceGroup command |
+| _\-\-rebalance \<clusterName resourceName replicas\>_ | Rebalance a resource |
+| _\-\-removeConfig \<configScope configScopeArgs configKeys\>_ | Remove user configs |
+| _\-\-removeConstraint \<clusterName constraintType constraintId\>_ | Remove a constraint |
+| _\-\-removeInstanceTag \<clusterName instanceId tag\>_ | Remove a tag from an instance |
+| _\-\-removeResourceProperty \<clusterName resourceName propertyName\>_ | Remove a resource property |
+| _\-\-resetInstance \<clusterName instanceId\>_ | Reset all erroneous partitions on an instance |
+| _\-\-resetPartition \<clusterName instanceId resourceName partitionName\>_ | Reset an erroneous partition |
+| _\-\-resetResource \<clusterName resourceName\>_ | Reset all erroneous partitions of a resource |
+| _\-\-setConfig \<configScope configScopeArgs configKeyValueMap\>_ | Set user configs |
+| _\-\-setConstraint \<clusterName constraintType constraintId constraintKeyValueMap\>_ | Set a constraint |
+| _\-\-swapInstance \<clusterName oldInstance newInstance\>_ | Swap an old instance with a new instance |
+| _\-\-zkSvr \<ZookeeperServerAddress\>_ | Provide zookeeper address |
+
+### REST interface
+
+The REST interface comes wit helix-admin-webapp package:
+
+``` 
+  - git clone https://git-wip-us.apache.org/repos/asf/incubator-helix.git
+  - cd incubator-helix 
+  - ./build
+  - cd helix-admin-webapp/target/helix-admin-webapp-pkg/bin
+  - chmod +x *.sh
+  - ./run-rest-admin.sh --zkSvr <zookeeperAddress> --port <port> // make sure zookeeper is running
+```
+
+#### URL and support methods
+
+* _/clusters_
+    * List all clusters
+
+    ```
+      curl http://localhost:8100/clusters
+    ```
+
+    * Add a cluster
+    
+    ```
+      curl -d 'jsonParameters={"command":"addCluster","clusterName":"MyCluster"}' -H "Content-Type: application/json" http://localhost:8100/clusters
+    ```
+
+* _/clusters/{clusterName}_
+    * List cluster information
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster
+    ```
+
+    * Enable/disable a cluster in distributed controller mode
+    
+    ```
+      curl -d 'jsonParameters={"command":"activateCluster","grandCluster":"MyControllerCluster","enabled":"true"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster
+    ```
+
+    * Remove a cluster
+    
+    ```
+      curl -X DELETE http://localhost:8100/clusters/MyCluster
+    ```
+    
+* _/clusters/{clusterName}/resourceGroups_
+    * List all resources in a cluster
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/resourceGroups
+    ```
+    
+    * Add a resource to cluster
+    
+    ```
+      curl -d 'jsonParameters={"command":"addResource","resourceGroupName":"MyDB","partitions":"8","stateModelDefRef":"MasterSlave" }' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups
+    ```
+
+* _/clusters/{clusterName}/resourceGroups/{resourceName}_
+    * List resource information
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+    ```
+    
+    * Drop a resource
+    
+    ```
+      curl -X DELETE http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+    ```
+
+    * Reset all erroneous partitions of a resource
+    
+    ```
+      curl -d 'jsonParameters={"command":"resetResource"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB
+    ```
+
+* _/clusters/{clusterName}/resourceGroups/{resourceName}/idealState_
+    * Rebalance a resource
+    
+    ```
+      curl -d 'jsonParameters={"command":"rebalance","replicas":"3"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+    ```
+
+    * Add an ideal state
+    
+    ```
+    echo jsonParameters={
+    "command":"addIdealState"
+       }&newIdealState={
+      "id" : "MyDB",
+      "simpleFields" : {
+        "IDEAL_STATE_MODE" : "AUTO",
+        "NUM_PARTITIONS" : "8",
+        "REBALANCE_MODE" : "SEMI_AUTO",
+        "REPLICAS" : "0",
+        "STATE_MODEL_DEF_REF" : "MasterSlave",
+        "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
+      },
+      "listFields" : {
+      },
+      "mapFields" : {
+        "MyDB_0" : {
+          "localhost_1001" : "MASTER",
+          "localhost_1002" : "SLAVE"
+        }
+      }
+    }
+    > newIdealState.json
+    curl -d @'./newIdealState.json' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+    ```
+    
+    * Add resource property
+    
+    ```
+      curl -d 'jsonParameters={"command":"addResourceProperty","REBALANCE_TIMER_PERIOD":"500"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/idealState
+    ```
+    
+* _/clusters/{clusterName}/resourceGroups/{resourceName}/externalView_
+    * Show resource external view
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/resourceGroups/MyDB/externalView
+    ```
+* _/clusters/{clusterName}/instances_
+    * List all instances
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/instances
+    ```
+
+    * Add an instance
+    
+    ```
+    curl -d 'jsonParameters={"command":"addInstance","instanceNames":"localhost_1001"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
+    ```
+    
+    * Swap an instance
+    
+    ```
+      curl -d 'jsonParameters={"command":"swapInstance","oldInstance":"localhost_1001", "newInstance":"localhost_1002"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances
+    ```
+* _/clusters/{clusterName}/instances/{instanceName}_
+    * Show instance information
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+    
+    * Enable/disable an instance
+    
+    ```
+      curl -d 'jsonParameters={"command":"enableInstance","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+
+    * Drop an instance
+    
+    ```
+      curl -X DELETE http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+    
+    * Disable/enable partitions on an instance
+    
+    ```
+      curl -d 'jsonParameters={"command":"enablePartition","resource": "MyDB","partition":"MyDB_0",  "enabled" : "false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+    
+    * Reset an erroneous partition on an instance
+    
+    ```
+      curl -d 'jsonParameters={"command":"resetPartition","resource": "MyDB","partition":"MyDB_0"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+
+    * Reset all erroneous partitions on an instance
+    
+    ```
+      curl -d 'jsonParameters={"command":"resetInstance"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/instances/localhost_1001
+    ```
+
+* _/clusters/{clusterName}/configs_
+    * Get user cluster level config
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/configs/cluster
+    ```
+    
+    * Set user cluster level config
+    
+    ```
+      curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
+    ```
+
+    * Remove user cluster level config
+    
+    ```
+    curl -d 'jsonParameters={"command":"removeConfig","configs":"key1,key2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/cluster
+    ```
+    
+    * Get/set/remove user participant level config
+    
+    ```
+      curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/participant/localhost_1001
+    ```
+    
+    * Get/set/remove resource level config
+    
+    ```
+    curl -d 'jsonParameters={"command":"setConfig","configs":"key1=value1,key2=value2"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/configs/resource/MyDB
+    ```
+
+* _/clusters/{clusterName}/controller_
+    * Show controller information
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/Controller
+    ```
+    
+    * Enable/disable cluster
+    
+    ```
+      curl -d 'jsonParameters={"command":"enableCluster","enabled":"false"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/Controller
+    ```
+
+* _/zkPath/{path}_
+    * Get information for zookeeper path
+    
+    ```
+      curl http://localhost:8100/zkPath/MyCluster
+    ```
+
+* _/clusters/{clusterName}/StateModelDefs_
+    * Show all state model definitions
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/StateModelDefs
+    ```
+
+    * Add a state mdoel definition
+    
+    ```
+      echo jsonParameters={
+        "command":"addStateModelDef"
+       }&newStateModelDef={
+          "id" : "OnlineOffline",
+          "simpleFields" : {
+            "INITIAL_STATE" : "OFFLINE"
+          },
+          "listFields" : {
+            "STATE_PRIORITY_LIST" : [ "ONLINE", "OFFLINE", "DROPPED" ],
+            "STATE_TRANSITION_PRIORITYLIST" : [ "OFFLINE-ONLINE", "ONLINE-OFFLINE", "OFFLINE-DROPPED" ]
+          },
+          "mapFields" : {
+            "DROPPED.meta" : {
+              "count" : "-1"
+            },
+            "OFFLINE.meta" : {
+              "count" : "-1"
+            },
+            "OFFLINE.next" : {
+              "DROPPED" : "DROPPED",
+              "ONLINE" : "ONLINE"
+            },
+            "ONLINE.meta" : {
+              "count" : "R"
+            },
+            "ONLINE.next" : {
+              "DROPPED" : "OFFLINE",
+              "OFFLINE" : "OFFLINE"
+            }
+          }
+        }
+        > newStateModelDef.json
+        curl -d @'./untitled.txt' -H 'Content-Type: application/json' http://localhost:8100/clusters/MyCluster/StateModelDefs
+    ```
+
+* _/clusters/{clusterName}/StateModelDefs/{stateModelDefName}_
+    * Show a state model definition
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/StateModelDefs/OnlineOffline
+    ```
+
+* _/clusters/{clusterName}/constraints/{constraintType}_
+    * Show all contraints
+    
+    ```
+      curl http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT
+    ```
+
+    * Set a contraint
+    
+    ```
+       curl -d 'jsonParameters={"constraintAttributes":"RESOURCE=MyDB,CONSTRAINT_VALUE=1"}' -H "Content-Type: application/json" http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
+    ```
+    
+    * Remove a constraint
+    
+    ```
+      curl -X DELETE http://localhost:8100/clusters/MyCluster/constraints/MESSAGE_CONSTRAINT/MyConstraint
+    ```
+

http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_controller.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Controller</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Controller
+
+Next, let\'s implement the controller.  This is the brain of the cluster.  Helix makes sure there is exactly one active controller running the cluster.
+
+### Start the Helix Agent
+
+
+It requires the following parameters:
+ 
+* clusterId: A logical ID to represent the group of nodes
+* controllerId: A logical ID of the process creating the controller instance. Generally this is host:port.
+* zkConnectString: Connection string to Zookeeper. This is of the form host1:port1,host2:port2,host3:port3. 
+
+```
+HelixConnection connection = new ZKHelixConnection(zkConnectString);
+HelixController controller = connection.createController(clusterId, controllerId);
+```
+
+### Controller Code
+
+The Controller needs to know about all changes in the cluster. Helix takes care of this with the default implementation.
+If you need additional functionality, see GenericHelixController and ZKHelixController for how to configure the pipeline.
+
+```
+HelixConnection connection = new ZKHelixConnection(zkConnectString);
+HelixController controller = connection.createController(clusterId, controllerId);
+controller.startAsync();
+```
+The snippet above shows how the controller is started. You can also start the controller using command line interface.
+  
+```
+cd helix/helix-core/target/helix-core-pkg/bin
+./run-helix-controller.sh --zkSvr <Zookeeper ServerAddress (Required)>  --cluster <Cluster name (Required)>
+```
+
+### Controller deployment modes
+
+Helix provides multiple options to deploy the controller.
+
+#### STANDALONE
+
+The Controller can be started as a separate process to manage a cluster. This is the recommended approach. However, since one controller can be a single point of failure, multiple controller processes are required for reliability.  Even if multiple controllers are running, only one will be actively managing the cluster at any time and is decided by a leader-election process. If the leader fails, another leader will take over managing the cluster.
+
+Even though we recommend this method of deployment, it has the drawback of having to manage an additional service for each cluster. See Controller As a Service option.
+
+#### EMBEDDED
+
+If setting up a separate controller process is not viable, then it is possible to embed the controller as a library in each of the participants.
+
+#### CONTROLLER AS A SERVICE
+
+One of the cool features we added in Helix is to use a set of controllers to manage a large number of clusters. 
+
+For example if you have X clusters to be managed, instead of deploying X*3 (3 controllers for fault tolerance) controllers for each cluster, one can deploy just 3 controllers.  Each controller can manage X/3 clusters.  If any controller fails, the remaining two will manage X/2 clusters.
+
+

http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_health.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Customizing Heath Checks</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Customizing Health Checks
+
+In this chapter, we\'ll learn how to customize the health check, based on metrics of your distributed system.  
+
+### Health Checks
+
+Note: _this in currently in development mode, not yet ready for production._
+
+Helix provides the ability for each node in the system to report health metrics on a periodic basis. 
+
+Helix supports multiple ways to aggregate these metrics:
+
+* SUM
+* AVG
+* EXPONENTIAL DECAY
+* WINDOW
+
+Helix persists the aggregated value only.
+
+Applications can define a threshold on the aggregate values according to the SLAs, and when the SLA is violated Helix will fire an alert. 
+Currently Helix only fires an alert, but in a future release we plan to use these metrics to either mark the node dead or load balance the partitions.
+This feature will be valuable for distributed systems that support multi-tenancy and have a large variation in work load patterns.  In addition, this can be used to detect skewed partitions (hotspots) and rebalance the cluster.
+

http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_messaging.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Messaging</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Messaging
+
+In this chapter, we\'ll learn about messaging, a convenient feature in Helix for sending messages between nodes of a cluster.  This is an interesting feature which is quite useful in practice. It is common that nodes in a distributed system require a mechanism to interact with each other.  
+
+### Example: Bootstrapping a Replica
+
+Consider a search system  where the index replica starts up and it does not have an index. A typical solution is to get the index from a common location, or to copy the index from another replica.
+
+Helix provides a messaging API for intra-cluster communication between nodes in the system.  Helix provides a mechanism to specify the message recipient in terms of resource, partition, and state rather than specifying hostnames.  Helix ensures that the message is delivered to all of the required recipients. In this particular use case, the instance can specify the recipient criteria as all replicas of the desired partition to bootstrap.
+Since Helix is aware of the global state of the system, it can send the message to appropriate nodes. Once the nodes respond, Helix provides the bootstrapping replica with all the responses.
+
+This is a very generic API and can also be used to schedule various periodic tasks in the cluster, such as data backups, log cleanup, etc.
+System Admins can also perform ad-hoc tasks, such as on-demand backups or a system command (such as rm -rf ;) across all nodes of the cluster
+
+```
+      ClusterMessagingService messagingService = manager.getMessagingService();
+
+      // Construct the Message
+      Message requestBackupUriRequest = new Message(
+          MessageType.USER_DEFINE_MSG, UUID.randomUUID().toString());
+      requestBackupUriRequest
+          .setMsgSubType(BootstrapProcess.REQUEST_BOOTSTRAP_URL);
+      requestBackupUriRequest.setMsgState(MessageState.NEW);
+
+      // Set the Recipient criteria: all nodes that satisfy the criteria will receive the message
+      Criteria recipientCriteria = new Criteria();
+      recipientCriteria.setInstanceName("%");
+      recipientCriteria.setRecipientInstanceType(InstanceType.PARTICIPANT);
+      recipientCriteria.setResource("MyDB");
+      recipientCriteria.setPartition("");
+
+      // Should be processed only by process(es) that are active at the time of sending the message
+      //   This means if the recipient is restarted after message is sent, it will not be processe.
+      recipientCriteria.setSessionSpecific(true);
+
+      // wait for 30 seconds
+      int timeout = 30000;
+
+      // the handler that will be invoked when any recipient responds to the message.
+      BootstrapReplyHandler responseHandler = new BootstrapReplyHandler();
+
+      // this will return only after all recipients respond or after timeout
+      int sentMessageCount = messagingService.sendAndWait(recipientCriteria,
+          requestBackupUriRequest, responseHandler, timeout);
+```
+
+See HelixManager.DefaultMessagingService in [Javadocs](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/messaging/DefaultMessagingService.html) for more info.
+

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Participant</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Participant
+
+In this chapter, we\'ll learn how to implement a Participant, which is a primary functional component of a distributed system.
+
+
+### Start the Helix Agent
+
+The Helix agent is a common component that connects each system component with the controller.
+
+It requires the following parameters:
+ 
+* clusterId: A logical ID to represent the group of nodes
+* participantId: A logical ID of the process creating the manager instance. Generally this is host:port.
+* zkConnectString: Connection string to Zookeeper. This is of the form host1:port1,host2:port2,host3:port3. 
+
+After the Helix participant instance is created, only thing that needs to be registered is the state model factory. 
+The methods of the State Model will be called when controller sends transitions to the Participant.  In this example, we'll use the OnlineOffline factory.  Other options include:
+
+* MasterSlaveStateModelFactory
+* LeaderStandbyStateModelFactory
+* BootstrapHandler
+* _An application defined state model factory_
+
+
+```
+HelixConnection connection = new ZKHelixConnection(zkConnectString);
+HelixParticipant participant = connection.createParticipant(clusterId, participantId);
+StateMachineEngine stateMach = participant.getStateMachineEngine();
+
+// create a stateModelFactory that returns a statemodel object for each partition. 
+StateModelFactory<StateModel> stateModelFactory = new OnlineOfflineStateModelFactory();     
+stateMach.registerStateModelFactory(stateModelType, stateModelFactory);
+participant.startAsync();
+```
+
+Helix doesn\'t know what it means to change from OFFLINE\-\-\>ONLINE or ONLINE\-\-\>OFFLINE.  The following code snippet shows where you insert your system logic for these two state transitions.
+
+```
+public class OnlineOfflineStateModelFactory extends StateModelFactory<StateModel> {
+  @Override
+  public StateModel createNewStateModel(String stateUnitKey) {
+    OnlineOfflineStateModel stateModel = new OnlineOfflineStateModel();
+    return stateModel;
+  }
+  @StateModelInfo(states = "{'OFFLINE','ONLINE'}", initialState = "OFFINE")
+  public static class OnlineOfflineStateModel extends StateModel {
+
+    @Transition(from = "OFFLINE", to = "ONLINE")
+    public void onBecomeOnlineFromOffline(Message message,
+        NotificationContext context) {
+
+      System.out.println("OnlineOfflineStateModel.onBecomeOnlineFromOffline()");
+
+      ////////////////////////////////////////////////////////////////////////////////////////////////
+      // Application logic to handle transition                                                     //
+      // For example, you might start a service, run initialization, etc                            //
+      ////////////////////////////////////////////////////////////////////////////////////////////////
+    }
+
+    @Transition(from = "ONLINE", to = "OFFLINE")
+    public void onBecomeOfflineFromOnline(Message message,
+        NotificationContext context) {
+
+      System.out.println("OnlineOfflineStateModel.onBecomeOfflineFromOnline()");
+
+      ////////////////////////////////////////////////////////////////////////////////////////////////
+      // Application logic to handle transition                                                     //
+      // For example, you might shutdown a service, log this event, or change monitoring settings   //
+      ////////////////////////////////////////////////////////////////////////////////////////////////
+    }
+  }
+}
+```
+

http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_propstore.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Application Property Store</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Application Property Store
+
+In this chapter, we\'ll learn how to use the application property store.
+
+### Property Store
+
+It is common that an application needs support for distributed, shared data structures.  Helix uses Zookeeper to store the application data and hence provides notifications when the data changes.
+
+While you could use Zookeeper directly, Helix supports caching the data and a write-through cache. This is far more efficient than reading from Zookeeper for every access.
+
+See [HelixManager.getHelixPropertyStore](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/store/package-summary.html) for details.

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Rebalancing Algorithms</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Rebalancing Algorithms
+
+The placement of partitions in a distributed system is essential for the reliability and scalability of the system.  For example, when a node fails, it is important that the partitions hosted on that node are reallocated evenly among the remaining nodes. Consistent hashing is one such algorithm that can satisfy this guarantee.  Helix provides a variant of consistent hashing based on the RUSH algorithm, among others.
+
+This means given a number of partitions, replicas and number of nodes, Helix does the automatic assignment of partition to nodes such that:
+
+* Each node has the same number of partitions
+* Replicas of the same partition do not stay on the same node
+* When a node fails, the partitions will be equally distributed among the remaining nodes
+* When new nodes are added, the number of partitions moved will be minimized along with satisfying the above criteria
+
+Helix employs a rebalancing algorithm to compute the _ideal state_ of the system.  When the _current state_ differs from the _ideal state_, Helix uses it as the target state of the system and computes the appropriate transitions needed to bring it to the _ideal state_.
+
+Helix makes it easy to perform this operation, while giving you control over the algorithm.  In this section, we\'ll see how to implement the desired behavior.
+
+Helix has four options for rebalancing, in increasing order of customization by the system builder:
+
+* FULL_AUTO
+* SEMI_AUTO
+* CUSTOMIZED
+* USER_DEFINED
+
+```
+            |FULL_AUTO     |  SEMI_AUTO | CUSTOMIZED|  USER_DEFINED  |
+            ---------------------------------------------------------|
+   LOCATION | HELIX        |  APP       |  APP      |      APP       |
+            ---------------------------------------------------------|
+      STATE | HELIX        |  HELIX     |  APP      |      APP       |
+            ----------------------------------------------------------
+```
+
+
+### FULL_AUTO
+
+When the rebalance mode is set to FULL_AUTO, Helix controls both the location of the replica along with the state. This option is useful for applications where creation of a replica is not expensive. 
+
+For example, consider this system that uses a MasterSlave state model, with 3 partitions and 2 replicas in the ideal state.
+
+```
+{
+  "id" : "MyResource",
+  "simpleFields" : {
+    "REBALANCE_MODE" : "FULL_AUTO",
+    "NUM_PARTITIONS" : "3",
+    "REPLICAS" : "2",
+    "STATE_MODEL_DEF_REF" : "MasterSlave",
+  }
+  "listFields" : {
+    "MyResource_0" : [],
+    "MyResource_1" : [],
+    "MyResource_2" : []
+  },
+  "mapFields" : {
+  }
+}
+```
+
+If there are 3 nodes in the cluster, then Helix will balance the masters and slaves equally.  The ideal state is therefore:
+
+```
+{
+  "id" : "MyResource",
+  "simpleFields" : {
+    "NUM_PARTITIONS" : "3",
+    "REPLICAS" : "2",
+    "STATE_MODEL_DEF_REF" : "MasterSlave",
+  },
+  "mapFields" : {
+    "MyResource_0" : {
+      "N1" : "MASTER",
+      "N2" : "SLAVE",
+    },
+    "MyResource_1" : {
+      "N2" : "MASTER",
+      "N3" : "SLAVE",
+    },
+    "MyResource_2" : {
+      "N3" : "MASTER",
+      "N1" : "SLAVE",
+    }
+  }
+}
+```
+
+Another typical example is evenly distributing a group of tasks among the currently healthy processes. For example, if there are 60 tasks and 4 nodes, Helix assigns 15 tasks to each node. 
+When one node fails, Helix redistributes its 15 tasks to the remaining 3 nodes, resulting in a balanced 20 tasks per node. Similarly, if a node is added, Helix re-allocates 3 tasks from each of the 4 nodes to the 5th node, resulting in a balanced distribution of 12 tasks per node.. 
+
+#### SEMI_AUTO
+
+When the application needs to control the placement of the replicas, use the SEMI_AUTO rebalance mode.
+
+Example: In the ideal state below, the partition \'MyResource_0\' is constrained to be placed only on node1 or node2.  The choice of _state_ is still controlled by Helix.  That means MyResource_0.MASTER could be on node1 and MyResource_0.SLAVE on node2, or vice-versa but neither would be placed on node3.
+
+```
+{
+  "id" : "MyResource",
+  "simpleFields" : {
+    "REBALANCE_MODE" : "SEMI_AUTO",
+    "NUM_PARTITIONS" : "3",
+    "REPLICAS" : "2",
+    "STATE_MODEL_DEF_REF" : "MasterSlave",
+  }
+  "listFields" : {
+    "MyResource_0" : [node1, node2],
+    "MyResource_1" : [node2, node3],
+    "MyResource_2" : [node3, node1]
+  },
+  "mapFields" : {
+  }
+}
+```
+
+The MasterSlave state model requires that a partition has exactly one MASTER at all times, and the other replicas should be SLAVEs.  In this simple example with 2 replicas per partition, there would be one MASTER and one SLAVE.  Upon failover, a SLAVE has to assume mastership, and a new SLAVE will be generated.
+
+In this mode when node1 fails, unlike in FULL_AUTO mode the partition is _not_ moved from node1 to node3. Instead, Helix will decide to change the state of MyResource_0 on node2 from SLAVE to MASTER, based on the system constraints. 
+
+#### CUSTOMIZED
+
+Helix offers a third mode called CUSTOMIZED, in which the application controls the placement _and_ state of each replica. The application needs to implement a callback interface that Helix invokes when the cluster state changes. 
+Within this callback, the application can recompute the idealstate. Helix will then issue appropriate transitions such that _Idealstate_ and _Currentstate_ converges.
+
+Here\'s an example, again with 3 partitions, 2 replicas per partition, and the MasterSlave state model:
+
+```
+{
+  "id" : "MyResource",
+  "simpleFields" : {
+    "REBALANCE_MODE" : "CUSTOMIZED",
+    "NUM_PARTITIONS" : "3",
+    "REPLICAS" : "2",
+    "STATE_MODEL_DEF_REF" : "MasterSlave",
+  },
+  "mapFields" : {
+    "MyResource_0" : {
+      "N1" : "MASTER",
+      "N2" : "SLAVE",
+    },
+    "MyResource_1" : {
+      "N2" : "MASTER",
+      "N3" : "SLAVE",
+    },
+    "MyResource_2" : {
+      "N3" : "MASTER",
+      "N1" : "SLAVE",
+    }
+  }
+}
+```
+
+Suppose the current state of the system is 'MyResource_0' -> {N1:MASTER, N2:SLAVE} and the application changes the ideal state to 'MyResource_0' -> {N1:SLAVE,N2:MASTER}. While the application decides which node is MASTER and which is SLAVE, Helix will not blindly issue MASTER-->SLAVE to N1 and SLAVE-->MASTER to N2 in parallel, since that might result in a transient state where both N1 and N2 are masters, which violates the MasterSlave constraint that there is exactly one MASTER at a time.  Helix will first issue MASTER-->SLAVE to N1 and after it is completed, it will issue SLAVE-->MASTER to N2. 
+
+#### USER_DEFINED
+
+For maximum flexibility, Helix exposes an interface that can allow applications to plug in custom rebalancing logic. By providing the name of a class that implements the Rebalancer interface, Helix will automatically call the contained method whenever there is a change to the live participants in the cluster. For more, see [User-Defined Rebalancer](./tutorial_user_def_rebalancer.html).
+
+#### Backwards Compatibility
+
+In previous versions, FULL_AUTO was called AUTO_REBALANCE and SEMI_AUTO was called AUTO. Furthermore, they were presented as the IDEAL_STATE_MODE. Helix supports both IDEAL_STATE_MODE and REBALANCE_MODE, but IDEAL_STATE_MODE is now deprecated and may be phased out in future versions.

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Spectator</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Spectator
+
+Next, we\'ll learn how to implement a Spectator.  Typically, a spectator needs to react to changes within the distributed system.  Examples: a client that needs to know where to send a request, a topic consumer in a consumer group.  The spectator is automatically informed of changes in the _external state_ of the cluster, but it does not have to add any code to keep track of other components in the system.
+
+### Start the Helix agent
+
+Same as for a Participant, The Helix agent is the common component that connects each system component with the controller.
+
+It requires the following parameters:
+
+* clusterName: A logical name to represent the group of nodes
+* instanceName: A logical name of the process creating the manager instance. Generally this is host:port.
+* instanceType: Type of the process. This can be one of the following types, in this case, use SPECTATOR:
+    * CONTROLLER: Process that controls the cluster, any number of controllers can be started but only one will be active at any given time.
+    * PARTICIPANT: Process that performs the actual task in the distributed system.
+    * SPECTATOR: Process that observes the changes in the cluster.
+    * ADMIN: To carry out system admin actions.
+* zkConnectString: Connection string to Zookeeper. This is of the form host1:port1,host2:port2,host3:port3.
+
+After the Helix manager instance is created, only thing that needs to be registered is the listener.  When the ExternalView changes, the listener is notified.
+
+### Spectator Code
+
+A spectator observes the cluster and is notified when the state of the system changes. Helix consolidates the state of entire cluster in one Znode called ExternalView.
+Helix provides a default implementation RoutingTableProvider that caches the cluster state and updates it when there is a change in the cluster.
+
+```
+manager = HelixManagerFactory.getZKHelixManager(clusterName,
+                                                          instanceName,
+                                                          InstanceType.PARTICIPANT,
+                                                          zkConnectString);
+manager.connect();
+RoutingTableProvider routingTableProvider = new RoutingTableProvider();
+manager.addExternalViewChangeListener(routingTableProvider);
+```
+
+In the following code snippet, the application sends the request to a valid instance by interrogating the external view.  Suppose the desired resource for this request is in the partition myDB_1.
+
+```
+## instances = routingTableProvider.getInstances(, "PARTITION_NAME", "PARTITION_STATE");
+instances = routingTableProvider.getInstances("myDB", "myDB_1", "ONLINE");
+
+////////////////////////////////////////////////////////////////////////////////////////////////
+// Application-specific code to send a request to one of the instances                        //
+////////////////////////////////////////////////////////////////////////////////////////////////
+
+theInstance = instances.get(0);  // should choose an instance and throw an exception if none are available
+result = theInstance.sendRequest(yourApplicationRequest, responseObject);
+
+```
+
+When the external view changes, the application needs to react by sending requests to a different instance.  
+

http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/150ce693/site-releases/trunk/src/site/markdown/tutorial_state.md
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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - State Machine Configuration</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): State Machine Configuration
+
+In this chapter, we\'ll learn about the state models provided by Helix, and how to create your own custom state model.
+
+## State Models
+
+Helix comes with 3 default state models that are commonly used.  It is possible to have multiple state models in a cluster. 
+Every resource that is added should be configured to use a state model that govern its _ideal state_.
+
+### MASTER-SLAVE
+
+* 3 states: OFFLINE, SLAVE, MASTER
+* Maximum number of masters: 1
+* Slaves are based on the replication factor. The replication factor can be specified while adding the resource.
+
+
+### ONLINE-OFFLINE
+
+* Has 2 states: OFFLINE and ONLINE.  This simple state model is a good starting point for most applications.
+
+### LEADER-STANDBY
+
+* 1 Leader and multiple stand-bys.  The idea is that exactly one leader accomplishes a designated task, the stand-bys are ready to take over if the leader fails.
+
+## Constraints
+
+In addition to the state machine configuration, one can specify the constraints of states and transitions.
+
+For example, one can say:
+
+* MASTER:1
+<br/>Maximum number of replicas in MASTER state at any time is 1
+
+* OFFLINE-SLAVE:5 
+<br/>Maximum number of OFFLINE-SLAVE transitions that can happen concurrently in the system is 5 in this example.
+
+### Dynamic State Constraints
+
+We also support two dynamic upper bounds for the number of replicas in each state:
+
+* N: The number of replicas in the state is at most the number of live participants in the cluster
+* R: The number of replicas in the state is at most the specified replica count for the partition
+
+### State Priority
+
+Helix uses a greedy approach to satisfy the state constraints. For example, if the state machine configuration says it needs 1 MASTER and 2 SLAVES, but only 1 node is active, Helix must promote it to MASTER. This behavior is achieved by providing the state priority list as \[MASTER, SLAVE\].
+
+### State Transition Priority
+
+Helix tries to fire as many transitions as possible in parallel to reach the stable state without violating constraints. By default, Helix simply sorts the transitions alphabetically and fires as many as it can without violating the constraints. You can control this by overriding the priority order.
+
+## Special States
+
+### DROPPED
+
+The DROPPED state is used to signify a replica that was served by a given participant, but is no longer served. This allows Helix and its participants to effectively clean up. There are two requirements that every new state model should follow with respect to the DROPPED state:
+
+* The DROPPED state must be defined
+* There must be a path to DROPPED for every state in the model
+
+### ERROR
+
+The ERROR state is used whenever the participant serving a partition encountered an error and cannot continue to serve the partition. HelixAdmin has \"reset\" functionality to allow for participants to recover from the ERROR state.
+
+## Annotated Example
+
+Below is a complete definition of a Master-Slave state model. Notice the fields marked REQUIRED; these are essential for any state model definition.
+
+```
+StateModelDefinition stateModel = new StateModelDefinition.Builder("MasterSlave")
+  // OFFLINE is the state that the system starts in (initial state is REQUIRED)
+  .initialState("OFFLINE")
+
+  // Lowest number here indicates highest priority, no value indicates lowest priority
+  .addState("MASTER", 1)
+  .addState("SLAVE", 2)
+  .addState("OFFLINE")
+
+  // Note the special inclusion of the DROPPED state (REQUIRED)
+  .addState(HelixDefinedState.DROPPED.toString())
+
+  // No more than one master allowed
+  .upperBound("MASTER", 1)
+
+  // R indicates an upper bound of number of replicas for each partition
+  .dynamicUpperBound("SLAVE", "R")
+
+  // Add some high-priority transitions
+  .addTransition("SLAVE", "MASTER", 1)
+  .addTransition("OFFLINE", "SLAVE", 2)
+
+  // Using the same priority value indicates that these transitions can fire in any order
+  .addTransition("MASTER", "SLAVE", 3)
+  .addTransition("SLAVE", "OFFLINE", 3)
+
+  // Not specifying a value defaults to lowest priority
+  // Notice the inclusion of the OFFLINE to DROPPED transition
+  // Since every state has a path to OFFLINE, they each now have a path to DROPPED (REQUIRED)
+  .addTransition("OFFLINE", HelixDefinedState.DROPPED.toString())
+
+  // Create the StateModelDefinition instance
+  .build();
+
+  // Use the isValid() function to make sure the StateModelDefinition will work without issues
+  Assert.assertTrue(stateModel.isValid());
+```
+
+

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - Throttling</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): Throttling
+
+In this chapter, we\'ll learn how to control the parallel execution of cluster tasks.  Only a centralized cluster manager with global knowledge is capable of coordinating this decision.
+
+### Throttling
+
+Since all state changes in the system are triggered through transitions, Helix can control the number of transitions that can happen in parallel. Some of the transitions may be light weight, but some might involve moving data, which is quite expensive from a network and IOPS perspective.
+
+Helix allows applications to set a threshold on transitions. The threshold can be set at multiple scopes:
+
+* MessageType e.g STATE_TRANSITION
+* TransitionType e.g SLAVE-MASTER
+* Resource e.g database
+* Node i.e per-node maximum transitions in parallel
+

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - User-Defined Rebalancing</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): User-Defined Rebalancing
+
+Even though Helix can compute both the location and the state of replicas internally using a default fully-automatic rebalancer, specific applications may require rebalancing strategies that optimize for different requirements. Thus, Helix allows applications to plug in arbitrary rebalancer algorithms that implement a provided interface. One of the main design goals of Helix is to provide maximum flexibility to any distributed application. Thus, it allows applications to fully implement the rebalancer, which is the core constraint solver in the system, if the application developer so chooses.
+
+Whenever the state of the cluster changes, as is the case when participants join or leave the cluster, Helix automatically calls the rebalancer to compute a new mapping of all the replicas in the resource. When using a pluggable rebalancer, the only required step is to register it with Helix. Subsequently, no additional bootstrapping steps are necessary. Helix uses reflection to look up and load the class dynamically at runtime. As a result, it is also technically possible to change the rebalancing strategy used at any time.
+
+The [HelixRebalancer](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/controller/rebalancer/HelixRebalancer.html) interface is as follows:
+
+```
+public void init(HelixManager helixManager);
+
+public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig, Cluster cluster,
+    ResourceCurrentState currentState);
+```
+The first parameter is a configuration of the resource to rebalance, the second is a full cache of all of the cluster data available to Helix, and the third is a snapshot of the actual current placements and state assignments. From the cluster variable, it is also possible to access the ResourceAssignment last generated by this rebalancer. Internally, Helix implements the same interface for its own rebalancing routines, so a user-defined rebalancer will be cognizant of the same information about the cluster as an internal implementation. Helix strives to provide applications the ability to implement algorithms that may require a large portion of the entire state of the cluster to make the best placement and state assignment decisions possible.
+
+A ResourceAssignment is a full representation of the location and the state of each replica of each partition of a given resource. This is a simple representation of the placement that the algorithm believes is the best possible. If the placement meets all defined constraints, this is what will become the actual state of the distributed system.
+
+### Rebalancer Context
+
+Helix provides an interface called [RebalancerContext](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/controller/rebalancer/context/RebalancerContext.html). For each of the four main [rebalancing modes](./tutorial_rebalance.html), there is a base class called [PartitionedRebalancerContext](http://helix.incubator.apache.org/apidocs/reference/org/apache/helix/controller/rebalancer/context/PartitionedRebalancerContext.html), which contains all of the basic properties required for a partitioned resource. Helix provides three derived classes for PartitionedRebalancerContext: FullAutoRebalancerContext, SemiAutoRebalancerContext, and CustomizedRebalancerContext. If none of these work for your application, you can create your own class that derives PartiitonedRebalancerContext (or even only implements RebalancerContext).
+
+### Specifying a Rebalancer
+
+#### Using Logical Accessors
+To specify the rebalancer, one can use ```PartitionedRebalancerContext#setRebalancerRef(RebalancerRef)``` to specify the specific implementation of the rebalancerClass. For example, here's a base constructed PartitionedRebalancerContext with a user-specified class:
+
+```
+RebalancerRef rebalancerRef = RebalancerRef.from(className);
+PartitionedRebalancerContext rebalanceContext =
+    new PartitionedRebalancerContext.Builder(resourceId).replicaCount(1).addPartition(partition1)
+        .addPartition(partition2).stateModelDefId(stateModelDef.getStateModelDefId())
+        .rebalancerRef(rebalancerRef).build();
+```
+
+The class name is a fully-qualified class name consisting of its package and its name, and the class should implement the Rebalancer interface. Now, the context can be added to a ResourceConfig through ```ResourceConfig.Builder#rebalancerContext(RebalancerContext)``` and the context will automatically be made available to the rebalancer for all subsequent executions.
+
+#### Using HelixAdmin
+For implementations that set up the cluster through existing code, the following HelixAdmin calls will update the Rebalancer class:
+
+```
+IdealState idealState = helixAdmin.getResourceIdealState(clusterName, resourceName);
+idealState.setRebalanceMode(RebalanceMode.USER_DEFINED);
+idealState.setRebalancerClassName(className);
+helixAdmin.setResourceIdealState(clusterName, resourceName, idealState);
+```
+There are two key fields to set to specify that a pluggable rebalancer should be used. First, the rebalance mode should be set to USER_DEFINED, and second the rebalancer class name should be set to a class that implements Rebalancer and is within the scope of the project. The class name is a fully-qualified class name consisting of its package and its name.
+
+#### Using YAML
+Alternatively, the rebalancer class name can be specified in a YAML file representing the cluster configuration. The requirements are the same, but the representation is more compact. Below are the first few lines of an example YAML file. To see a full YAML specification, see the [YAML tutorial](./tutorial_yaml.html).
+
+```
+clusterName: lock-manager-custom-rebalancer # unique name for the cluster
+resources:
+  - name: lock-group # unique resource name
+    rebalancer: # we will provide our own rebalancer
+      mode: USER_DEFINED
+      class: domain.project.helix.rebalancer.UserDefinedRebalancerClass
+...
+```
+
+### Example
+We demonstrate plugging in a simple user-defined rebalancer as part of a revisit of the [distributed lock manager](./recipes/user_def_rebalancer.html) example. It includes a functional Rebalancer implementation, as well as the entire YAML file used to define the cluster.
+
+Consider the case where partitions are locks in a lock manager and 6 locks are to be distributed evenly to a set of participants, and only one participant can hold each lock. We can define a rebalancing algorithm that simply takes the modulus of the lock number and the number of participants to evenly distribute the locks across participants. Helix allows capping the number of partitions a participant can accept, but since locks are lightweight, we do not need to define a restriction in this case. The following is a succinct implementation of this algorithm.
+
+```
+@Override
+public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig, Cluster cluster,
+    ResourceCurrentState currentState) {
+  // Get the rebalcancer context (a basic partitioned one)
+  PartitionedRebalancerContext context = rebalancerConfig.getRebalancerContext(
+      PartitionedRebalancerContext.class);
+
+  // Initialize an empty mapping of locks to participants
+  ResourceAssignment assignment = new ResourceAssignment(context.getResourceId());
+
+  // Get the list of live participants in the cluster
+  List<ParticipantId> liveParticipants = new ArrayList<ParticipantId>(
+      cluster.getLiveParticipantMap().keySet());
+
+  // Get the state model (should be a simple lock/unlock model) and the highest-priority state
+  StateModelDefId stateModelDefId = context.getStateModelDefId();
+  StateModelDefinition stateModelDef = cluster.getStateModelMap().get(stateModelDefId);
+  if (stateModelDef.getStatesPriorityList().size() < 1) {
+    LOG.error("Invalid state model definition. There should be at least one state.");
+    return assignment;
+  }
+  State lockState = stateModelDef.getTypedStatesPriorityList().get(0);
+
+  // Count the number of participants allowed to lock each lock
+  String stateCount = stateModelDef.getNumParticipantsPerState(lockState);
+  int lockHolders = 0;
+  try {
+    // a numeric value is a custom-specified number of participants allowed to lock the lock
+    lockHolders = Integer.parseInt(stateCount);
+  } catch (NumberFormatException e) {
+    LOG.error("Invalid state model definition. The lock state does not have a valid count");
+    return assignment;
+  }
+
+  // Fairly assign the lock state to the participants using a simple mod-based sequential
+  // assignment. For instance, if each lock can be held by 3 participants, lock 0 would be held
+  // by participants (0, 1, 2), lock 1 would be held by (1, 2, 3), and so on, wrapping around the
+  // number of participants as necessary.
+  // This assumes a simple lock-unlock model where the only state of interest is which nodes have
+  // acquired each lock.
+  int i = 0;
+  for (PartitionId partition : context.getPartitionSet()) {
+    Map<ParticipantId, State> replicaMap = new HashMap<ParticipantId, State>();
+    for (int j = i; j < i + lockHolders; j++) {
+      int participantIndex = j % liveParticipants.size();
+      ParticipantId participant = liveParticipants.get(participantIndex);
+      // enforce that a participant can only have one instance of a given lock
+      if (!replicaMap.containsKey(participant)) {
+        replicaMap.put(participant, lockState);
+      }
+    }
+    assignment.addReplicaMap(partition, replicaMap);
+    i++;
+  }
+  return assignment;
+}
+```
+
+Here is the ResourceAssignment emitted by the user-defined rebalancer for a 3-participant system whenever there is a change to the set of participants.
+
+* Participant_A joins
+
+```
+{
+  "lock_0": { "Participant_A": "LOCKED"},
+  "lock_1": { "Participant_A": "LOCKED"},
+  "lock_2": { "Participant_A": "LOCKED"},
+  "lock_3": { "Participant_A": "LOCKED"},
+  "lock_4": { "Participant_A": "LOCKED"},
+  "lock_5": { "Participant_A": "LOCKED"},
+}
+```
+
+A ResourceAssignment is a mapping for each resource of partition to the participant serving each replica and the state of each replica. The state model is a simple LOCKED/RELEASED model, so participant A holds all lock partitions in the LOCKED state.
+
+* Participant_B joins
+
+```
+{
+  "lock_0": { "Participant_A": "LOCKED"},
+  "lock_1": { "Participant_B": "LOCKED"},
+  "lock_2": { "Participant_A": "LOCKED"},
+  "lock_3": { "Participant_B": "LOCKED"},
+  "lock_4": { "Participant_A": "LOCKED"},
+  "lock_5": { "Participant_B": "LOCKED"},
+}
+```
+
+Now that there are two participants, the simple mod-based function assigns every other lock to the second participant. On any system change, the rebalancer is invoked so that the application can define how to redistribute its resources.
+
+* Participant_C joins (steady state)
+
+```
+{
+  "lock_0": { "Participant_A": "LOCKED"},
+  "lock_1": { "Participant_B": "LOCKED"},
+  "lock_2": { "Participant_C": "LOCKED"},
+  "lock_3": { "Participant_A": "LOCKED"},
+  "lock_4": { "Participant_B": "LOCKED"},
+  "lock_5": { "Participant_C": "LOCKED"},
+}
+```
+
+This is the steady state of the system. Notice that four of the six locks now have a different owner. That is because of the naïve modulus-based assignmemt approach used by the user-defined rebalancer. However, the interface is flexible enough to allow you to employ consistent hashing or any other scheme if minimal movement is a system requirement.
+
+* Participant_B fails
+
+```
+{
+  "lock_0": { "Participant_A": "LOCKED"},
+  "lock_1": { "Participant_C": "LOCKED"},
+  "lock_2": { "Participant_A": "LOCKED"},
+  "lock_3": { "Participant_C": "LOCKED"},
+  "lock_4": { "Participant_A": "LOCKED"},
+  "lock_5": { "Participant_C": "LOCKED"},
+}
+```
+
+On any node failure, as in the case of node addition, the rebalancer is invoked automatically so that it can generate a new mapping as a response to the change. Helix ensures that the Rebalancer has the opportunity to reassign locks as required by the application.
+
+* Participant_B (or the replacement for the original Participant_B) rejoins
+
+```
+{
+  "lock_0": { "Participant_A": "LOCKED"},
+  "lock_1": { "Participant_B": "LOCKED"},
+  "lock_2": { "Participant_C": "LOCKED"},
+  "lock_3": { "Participant_A": "LOCKED"},
+  "lock_4": { "Participant_B": "LOCKED"},
+  "lock_5": { "Participant_C": "LOCKED"},
+}
+```
+
+The rebalancer was invoked once again and the resulting ResourceAssignment reflects the steady state.
+
+### Caveats
+- The rebalancer class must be available at runtime, or else Helix will not attempt to rebalance at all
\ No newline at end of file

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+<!---
+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.
+-->
+
+<head>
+  <title>Tutorial - YAML Cluster Setup</title>
+</head>
+
+# [Helix Tutorial](./Tutorial.html): YAML Cluster Setup
+
+As an alternative to using Helix Admin to set up the cluster, its resources, constraints, and the state model, Helix supports bootstrapping a cluster configuration based on a YAML file. Below is an annotated example of such a file for a simple distributed lock manager where a lock can only be LOCKED or RELEASED, and each lock only allows a single participant to hold it in the LOCKED state.
+
+```
+clusterName: lock-manager-custom-rebalancer # unique name for the cluster (required)
+resources:
+  - name: lock-group # unique resource name (required)
+    rebalancer: # required
+      mode: USER_DEFINED # required - USER_DEFINED means we will provide our own rebalancer
+      class: org.apache.helix.userdefinedrebalancer.LockManagerRebalancer # required for USER_DEFINED
+    partitions:
+      count: 12 # number of partitions for the resource (default is 1)
+      replicas: 1 # number of replicas per partition (default is 1)
+    stateModel:
+      name: lock-unlock # model name (required)
+      states: [LOCKED, RELEASED, DROPPED] # the list of possible states (required if model not built-in)
+      transitions: # the list of possible transitions (required if model not built-in)
+        - name: Unlock
+          from: LOCKED
+          to: RELEASED
+        - name: Lock
+          from: RELEASED
+          to: LOCKED
+        - name: DropLock
+          from: LOCKED
+          to: DROPPED
+        - name: DropUnlock
+          from: RELEASED
+          to: DROPPED
+        - name: Undrop
+          from: DROPPED
+          to: RELEASED
+      initialState: RELEASED # (required if model not built-in)
+    constraints:
+      state:
+        counts: # maximum number of replicas of a partition that can be in each state (required if model not built-in)
+          - name: LOCKED
+            count: "1"
+          - name: RELEASED
+            count: "-1"
+          - name: DROPPED
+            count: "-1"
+        priorityList: [LOCKED, RELEASED, DROPPED] # states in order of priority (all priorities equal if not specified)
+      transition: # transitions priority to enforce order that transitions occur
+        priorityList: [Unlock, Lock, Undrop, DropUnlock, DropLock] # all priorities equal if not specified
+participants: # list of nodes that can serve replicas (optional if dynamic joining is active, required otherwise)
+  - name: localhost_12001
+    host: localhost
+    port: 12001
+  - name: localhost_12002
+    host: localhost
+    port: 12002
+  - name: localhost_12003
+    host: localhost
+    port: 12003
+```
+
+Using a file like the one above, the cluster can be set up either with the command line:
+
+```
+incubator-helix/helix-core/target/helix-core/pkg/bin/YAMLClusterSetup.sh localhost:2199 lock-manager-config.yaml
+```
+
+or with code:
+
+```
+YAMLClusterSetup setup = new YAMLClusterSetup(zkAddress);
+InputStream input =
+    Thread.currentThread().getContextClassLoader()
+        .getResourceAsStream("lock-manager-config.yaml");
+YAMLClusterSetup.YAMLClusterConfig config = setup.setupCluster(input);
+```
+
+Some notes:
+
+- A rebalancer class is only required for the USER_DEFINED mode. It is ignored otherwise.
+
+- Built-in state models, like OnlineOffline, LeaderStandby, and MasterSlave, or state models that have already been added only require a name for stateModel. If partition and/or replica counts are not provided, a value of 1 is assumed.
\ No newline at end of file

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+#
+# 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.
+#
+
+Redirect /download.html /download.cgi

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+#!/bin/sh
+# Just call the standard mirrors.cgi script. It will use download.html
+# as the input template.
+#
+# 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.
+#
+exec /www/www.apache.org/dyn/mirrors/mirrors.cgi $*

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+++ b/site-releases/trunk/src/site/site.xml
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!--
+  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.
+-->
+<project name="Apache Helix">
+  <bannerLeft>
+    <src>images/helix-logo.jpg</src>
+    <href>http://helix.incubator.apache.org/site-releases/0.7.0-incubating-site</href>
+  </bannerLeft>
+  <bannerRight>
+    <src>http://incubator.apache.org/images/egg-logo.png</src>
+    <href>http://incubator.apache.org/</href>
+  </bannerRight>
+  <version position="none"/>
+
+  <publishDate position="right"/>
+
+  <skin>
+    <groupId>org.apache.maven.skins</groupId>
+    <artifactId>maven-fluido-skin</artifactId>
+    <version>1.3.0</version>
+  </skin>
+
+  <body>
+
+    <head>
+      <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 ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+        })();
+
+      </script>
+
+    </head>
+
+    <breadcrumbs position="left">
+      <item name="Apache Helix" href="http://helix.incubator.apache.org/"/>
+      <item name="trunk" href="http://helix.incubator.apache.org/site-releases/trunk-site/"/>
+    </breadcrumbs>
+
+    <menu name="Apache Helix">
+      <item name="Home" href="../../index.html"/>
+    </menu>
+
+    <menu name="Helix Trunk">
+      <item name="Introduction" href="./index.html"/>
+      <item name="Getting Helix" href="./Building.html"/>
+      <item name="Core concepts" href="./Concepts.html"/>
+      <item name="Architecture" href="./Architecture.html"/>
+      <item name="Quick Start" href="./Quickstart.html"/>
+      <item name="Tutorial" href="./Tutorial.html"/>
+    </menu>
+
+    <menu name="Recipes">
+      <item name="Distributed lock manager" href="./recipes/lock_manager.html"/>
+      <item name="Rabbit MQ consumer group" href="./recipes/rabbitmq_consumer_group.html"/>
+      <item name="Rsync replicated file store" href="./recipes/rsync_replicated_file_store.html"/>
+      <item name="Service Discovery" href="./recipes/service_discovery.html"/>
+      <item name="Distributed task DAG Execution" href="./recipes/task_dag_execution.html"/>
+      <item name="User-defined rebalancer" href="./recipes/user_def_rebalancer.html"/>
+    </menu>
+<!--
+    <menu ref="reports" inherit="bottom"/>
+    <menu ref="modules" inherit="bottom"/>
+
+
+    <menu name="ASF">
+      <item name="How Apache Works" href="http://www.apache.org/foundation/how-it-works.html"/>
+      <item name="Foundation" href="http://www.apache.org/foundation/"/>
+      <item name="Sponsoring Apache" href="http://www.apache.org/foundation/sponsorship.html"/>
+      <item name="Thanks" href="http://www.apache.org/foundation/thanks.html"/>
+    </menu>
+-->
+    <footer>
+      <div class="row span16"><div>Apache Helix, Apache, the Apache feather logo, and the Apache Helix project logos are trademarks of The Apache Software Foundation.
+        All other marks mentioned may be trademarks or registered trademarks of their respective owners.</div>
+        <a href="${project.url}/privacy-policy.html">Privacy Policy</a>
+      </div>
+    </footer>
+
+
+  </body>
+
+  <custom>
+    <fluidoSkin>
+      <topBarEnabled>true</topBarEnabled>
+      <!-- twitter link work only with sidebar disabled -->
+      <sideBarEnabled>true</sideBarEnabled>
+      <googleSearch></googleSearch>
+      <twitter>
+        <user>ApacheHelix</user>
+        <showUser>true</showUser>
+        <showFollowers>false</showFollowers>
+      </twitter>
+    </fluidoSkin>
+  </custom>
+
+</project>


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