Apache Helix

Helix Tutorial: Admin Operations

Helix provides a set of admin APIs for cluster management operations. They are supported via:

  • Java API
  • Command Line Interface
  • REST Interface via helix-admin-webapp

Java API

See interface org.apache.helix.HelixAdmin

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/helix.git
cd helix
git checkout tags/helix-1.4.1
./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>

Supported Commands

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/helix.git
cd helix
git checkout tags/helix-1.4.1
./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":"LeaderStandby" }' -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" : "LeaderStandby",
    "STATE_MODEL_FACTORY_NAME" : "DEFAULT"
  },
  "listFields" : {
  },
  "mapFields" : {
    "MyDB_0" : {
      "localhost_1001" : "LEADER",
      "localhost_1002" : "STANDBY"
    }
  }
}
> 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

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