i3wangyi commented on a change in pull request #362: The WAGED rebalancer
cluster model implementation
URL: https://github.com/apache/helix/pull/362#discussion_r307853541
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File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/model/AssignableNode.java
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@@ -19,10 +19,290 @@
* under the License.
*/
+import org.apache.helix.HelixException;
+import
org.apache.helix.controller.dataproviders.ResourceControllerDataProvider;
+import org.apache.helix.model.ClusterConfig;
+import org.apache.helix.model.InstanceConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static java.lang.Math.max;
+
/**
- * A placeholder before we have the implementation.
- *
- * This class represents a potential allocation of the replication.
- * Note that AssignableNode is not thread safe.
+ * This class represents a possible allocation of the replication.
+ * Note that any usage updates to the AssignableNode are not thread safe.
*/
-public class AssignableNode { }
+public class AssignableNode {
+ private static final Logger _logger =
LoggerFactory.getLogger(AssignableNode.class.getName());
+
+ // proposed assignment tracking
+ // <resource name, partition name>
+ private Map<String, Set<String>> _currentAssignments;
+ // <resource name, top state partition name>
+ private Map<String, Set<String>> _currentTopStateAssignments;
+ // <capacity key, capacity value>
+ private Map<String, Integer> _currentCapacity;
+ // runtime usage tracking
+ private int _totalReplicaAssignmentCount;
+ private float _highestCapacityUtilization;
+
+ // basic node information
+ private final String _instanceName;
+ private Set<String> _instanceTags;
+ private String _faultZone;
+ private Map<String, List<String>> _disabledPartitionsMap;
+ private Map<String, Integer> _maxCapacity;
+ private int _maxPartition;
+
+ AssignableNode(ResourceControllerDataProvider clusterCache, String
instanceName,
+ Collection<AssignableReplica> existingAssignment) {
+ _instanceName = instanceName;
+ refresh(clusterCache, existingAssignment);
+ }
+
+ private void reset() {
+ _currentAssignments = new HashMap<>();
+ _currentTopStateAssignments = new HashMap<>();
+ _currentCapacity = new HashMap<>();
+ _totalReplicaAssignmentCount = 0;
+ _highestCapacityUtilization = 0;
+ }
+
+ /**
+ * Update the node with a ClusterDataCache. This resets the current
assignment and recalculate currentCapacity.
+ * NOTE: While this is required to be used in the constructor, this can also
be used when the clusterCache needs to be
+ * refreshed. This is under the assumption that the capacity mappings of
InstanceConfig and ResourceConfig could
+ * subject to changes. If the assumption is no longer true, this function
should become private.
+ *
+ * @param clusterCache - the current cluster cache to initial the
AssignableNode.
+ */
+ private void refresh(ResourceControllerDataProvider clusterCache,
Review comment:
The refresh method is too verbose and it is actually part of the
constructor. Suggest using Builder pattern.
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