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Example 1 with PersistAssignmentStage

use of org.apache.helix.controller.stages.PersistAssignmentStage in project helix by apache.

the class TestPersistAssignmentStage method testSimple.

/**
 * Case where we have one resource in IdealState
 * @throws Exception
 */
@Test
public void testSimple() throws Exception {
    int nodes = 2;
    List<String> instances = new ArrayList<String>();
    for (int i = 0; i < nodes; i++) {
        instances.add("localhost_" + i);
    }
    int partitions = 10;
    int replicas = 1;
    String resourceName = "testResource";
    ZNRecord record = DefaultIdealStateCalculator.calculateIdealState(instances, partitions, replicas, resourceName, "ONLINE", "OFFLINE");
    IdealState idealState = new IdealState(record);
    idealState.setStateModelDefRef("OnlineOffline");
    // Read and load current state into event
    HelixDataAccessor accessor = _manager.getHelixDataAccessor();
    PropertyKey.Builder keyBuilder = accessor.keyBuilder();
    accessor.setProperty(keyBuilder.idealStates(resourceName), idealState);
    runStage(_manager, event, new ReadClusterDataStage());
    runStage(_manager, event, new ResourceComputationStage());
    // Ensure persist best possible assignment is true
    ClusterConfig clusterConfig = new ClusterConfig(CLUSTER_NAME);
    clusterConfig.setPersistBestPossibleAssignment(true);
    ClusterDataCache cache = event.getAttribute(AttributeName.ClusterDataCache.name());
    cache.setClusterConfig(clusterConfig);
    // 1. Change best possible state (simulate a new rebalancer run)
    BestPossibleStateOutput bestPossibleStateOutput = new BestPossibleStateOutput();
    for (String partition : idealState.getPartitionSet()) {
        bestPossibleStateOutput.setState(resourceName, new Partition(partition), "localhost_3", "OFFLINE");
    }
    // 2. At the same time, set DelayRebalanceEnabled = true (simulate a Admin operation at the same time)
    idealState.setDelayRebalanceEnabled(true);
    accessor.setProperty(keyBuilder.idealStates(resourceName), idealState);
    // Persist new assignment
    PersistAssignmentStage stage = new PersistAssignmentStage();
    event.addAttribute(AttributeName.BEST_POSSIBLE_STATE.name(), bestPossibleStateOutput);
    runStage(_manager, event, stage);
    IdealState newIdealState = accessor.getProperty(keyBuilder.idealStates(resourceName));
    // 1. New assignment should be set
    Assert.assertEquals(newIdealState.getPartitionSet().size(), idealState.getPartitionSet().size());
    for (String partition : idealState.getPartitionSet()) {
        Map<String, String> assignment = newIdealState.getInstanceStateMap(partition);
        Assert.assertNotNull(assignment);
        Assert.assertEquals(assignment.size(), 1);
        Assert.assertTrue(assignment.containsKey("localhost_3") && assignment.get("localhost_3").equals("OFFLINE"));
    }
    // 2. Admin config should be set
    Assert.assertTrue(newIdealState.isDelayRebalanceEnabled());
}
Also used : Partition(org.apache.helix.model.Partition) PersistAssignmentStage(org.apache.helix.controller.stages.PersistAssignmentStage) BestPossibleStateOutput(org.apache.helix.controller.stages.BestPossibleStateOutput) ResourceComputationStage(org.apache.helix.controller.stages.ResourceComputationStage) ClusterDataCache(org.apache.helix.controller.stages.ClusterDataCache) ReadClusterDataStage(org.apache.helix.controller.stages.ReadClusterDataStage) ArrayList(java.util.ArrayList) IdealState(org.apache.helix.model.IdealState) HelixDataAccessor(org.apache.helix.HelixDataAccessor) ZNRecord(org.apache.helix.ZNRecord) PropertyKey(org.apache.helix.PropertyKey) ClusterConfig(org.apache.helix.model.ClusterConfig) Test(org.testng.annotations.Test)

Aggregations

ArrayList (java.util.ArrayList)1 HelixDataAccessor (org.apache.helix.HelixDataAccessor)1 PropertyKey (org.apache.helix.PropertyKey)1 ZNRecord (org.apache.helix.ZNRecord)1 BestPossibleStateOutput (org.apache.helix.controller.stages.BestPossibleStateOutput)1 ClusterDataCache (org.apache.helix.controller.stages.ClusterDataCache)1 PersistAssignmentStage (org.apache.helix.controller.stages.PersistAssignmentStage)1 ReadClusterDataStage (org.apache.helix.controller.stages.ReadClusterDataStage)1 ResourceComputationStage (org.apache.helix.controller.stages.ResourceComputationStage)1 ClusterConfig (org.apache.helix.model.ClusterConfig)1 IdealState (org.apache.helix.model.IdealState)1 Partition (org.apache.helix.model.Partition)1 Test (org.testng.annotations.Test)1