You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@helix.apache.org by ka...@apache.org on 2013/10/16 02:09:46 UTC
[3/4] [HELIX-209] Moving rebalancer code around, take 2
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancerContext.java
deleted file mode 100644
index e1f1ac2..0000000
--- a/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancerContext.java
+++ /dev/null
@@ -1,176 +0,0 @@
-package org.apache.helix.api.rebalancer;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.helix.api.State;
-import org.apache.helix.api.id.ParticipantId;
-import org.apache.helix.api.id.PartitionId;
-import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.api.rebalancer.util.ConstraintBasedAssignment;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy.DefaultPlacementScheme;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy.ReplicaPlacementScheme;
-import org.apache.helix.model.IdealState;
-import org.apache.helix.model.IdealState.RebalanceMode;
-import org.apache.helix.model.StateModelDefinition;
-import org.codehaus.jackson.annotate.JsonIgnore;
-import org.codehaus.jackson.annotate.JsonProperty;
-
-import com.google.common.collect.Maps;
-
-/*
- * 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.
- */
-
-/**
- * RebalancerContext for SEMI_AUTO rebalancer mode. It indicates the preferred locations of each
- * partition replica. By default, it corresponds to {@link SemiAutoRebalancer}
- */
-public final class SemiAutoRebalancerContext extends PartitionedRebalancerContext {
- @JsonProperty("preferenceLists")
- private Map<PartitionId, List<ParticipantId>> _preferenceLists;
-
- /**
- * Instantiate a SemiAutoRebalancerContext
- */
- public SemiAutoRebalancerContext() {
- super(RebalanceMode.SEMI_AUTO);
- setRebalancerRef(RebalancerRef.from(SemiAutoRebalancer.class));
- _preferenceLists = Maps.newHashMap();
- }
-
- /**
- * Get the preference lists of all partitions of the resource
- * @return map of partition id to list of participant ids
- */
- public Map<PartitionId, List<ParticipantId>> getPreferenceLists() {
- return _preferenceLists;
- }
-
- /**
- * Set the preference lists of all partitions of the resource
- * @param preferenceLists
- */
- public void setPreferenceLists(Map<PartitionId, List<ParticipantId>> preferenceLists) {
- _preferenceLists = preferenceLists;
- }
-
- /**
- * Get the preference list of a partition
- * @param partitionId the partition to look up
- * @return list of participant ids
- */
- @JsonIgnore
- public List<ParticipantId> getPreferenceList(PartitionId partitionId) {
- return _preferenceLists.get(partitionId);
- }
-
- /**
- * Generate preference lists based on a default cluster setup
- * @param stateModelDef the state model definition to follow
- * @param participantSet the set of participant ids to configure for
- */
- @Override
- @JsonIgnore
- public void generateDefaultConfiguration(StateModelDefinition stateModelDef,
- Set<ParticipantId> participantSet) {
- // compute default upper bounds
- Map<State, String> upperBounds = Maps.newHashMap();
- for (State state : stateModelDef.getTypedStatesPriorityList()) {
- upperBounds.put(state, stateModelDef.getNumParticipantsPerState(state));
- }
-
- // determine the current mapping
- Map<PartitionId, Map<ParticipantId, State>> currentMapping = Maps.newHashMap();
- for (PartitionId partitionId : getPartitionSet()) {
- List<ParticipantId> preferenceList = getPreferenceList(partitionId);
- if (preferenceList != null && !preferenceList.isEmpty()) {
- Set<ParticipantId> disabledParticipants = Collections.emptySet();
- Map<ParticipantId, State> emptyCurrentState = Collections.emptyMap();
- Map<ParticipantId, State> initialMap =
- ConstraintBasedAssignment.computeAutoBestStateForPartition(upperBounds,
- participantSet, stateModelDef, preferenceList, emptyCurrentState,
- disabledParticipants);
- currentMapping.put(partitionId, initialMap);
- }
- }
-
- // determine the preference
- LinkedHashMap<State, Integer> stateCounts =
- ConstraintBasedAssignment.stateCount(upperBounds, stateModelDef, participantSet.size(),
- getReplicaCount());
- ReplicaPlacementScheme placementScheme = new DefaultPlacementScheme();
- List<ParticipantId> participantList = new ArrayList<ParticipantId>(participantSet);
- List<PartitionId> partitionList = new ArrayList<PartitionId>(getPartitionSet());
- AutoRebalanceStrategy strategy =
- new AutoRebalanceStrategy(ResourceId.from(""), partitionList, stateCounts,
- getMaxPartitionsPerParticipant(), placementScheme);
- Map<String, List<String>> rawPreferenceLists =
- strategy.typedComputePartitionAssignment(participantList, currentMapping, participantList)
- .getListFields();
- Map<PartitionId, List<ParticipantId>> preferenceLists =
- Maps.newHashMap(IdealState.preferenceListsFromStringLists(rawPreferenceLists));
- setPreferenceLists(preferenceLists);
- }
-
- /**
- * Build a SemiAutoRebalancerContext. By default, it corresponds to {@link SemiAutoRebalancer}
- */
- public static final class Builder extends PartitionedRebalancerContext.AbstractBuilder<Builder> {
- private final Map<PartitionId, List<ParticipantId>> _preferenceLists;
-
- /**
- * Instantiate for a resource
- * @param resourceId resource id
- */
- public Builder(ResourceId resourceId) {
- super(resourceId);
- super.rebalancerRef(RebalancerRef.from(SemiAutoRebalancer.class));
- _preferenceLists = Maps.newHashMap();
- }
-
- /**
- * Add a preference list for a partition
- * @param partitionId partition to set
- * @param preferenceList ordered list of participants who can serve the partition
- * @return Builder
- */
- public Builder preferenceList(PartitionId partitionId, List<ParticipantId> preferenceList) {
- _preferenceLists.put(partitionId, preferenceList);
- return self();
- }
-
- @Override
- protected Builder self() {
- return this;
- }
-
- @Override
- public SemiAutoRebalancerContext build() {
- SemiAutoRebalancerContext context = new SemiAutoRebalancerContext();
- super.update(context);
- context.setPreferenceLists(_preferenceLists);
- return context;
- }
- }
-}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/api/rebalancer/util/ConstraintBasedAssignment.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/util/ConstraintBasedAssignment.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/util/ConstraintBasedAssignment.java
deleted file mode 100644
index 0199796..0000000
--- a/helix-core/src/main/java/org/apache/helix/api/rebalancer/util/ConstraintBasedAssignment.java
+++ /dev/null
@@ -1,244 +0,0 @@
-package org.apache.helix.api.rebalancer.util;
-
-/*
- * 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.
- */
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.helix.HelixConstants.StateModelToken;
-import org.apache.helix.HelixDefinedState;
-import org.apache.helix.api.Cluster;
-import org.apache.helix.api.Participant;
-import org.apache.helix.api.Scope;
-import org.apache.helix.api.State;
-import org.apache.helix.api.config.ClusterConfig;
-import org.apache.helix.api.id.ParticipantId;
-import org.apache.helix.api.id.PartitionId;
-import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.model.StateModelDefinition;
-import org.apache.log4j.Logger;
-
-import com.google.common.base.Predicate;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Sets;
-
-/**
- * Collection of functions that will compute the best possible state based on the participants and
- * the rebalancer configuration of a resource.
- */
-public class ConstraintBasedAssignment {
- private static Logger logger = Logger.getLogger(ConstraintBasedAssignment.class);
-
- /**
- * Get a set of disabled participants for a partition
- * @param participantMap map of all participants
- * @param partitionId the partition to check
- * @return a set of all participants that are disabled for the partition
- */
- public static Set<ParticipantId> getDisabledParticipants(
- final Map<ParticipantId, Participant> participantMap, final PartitionId partitionId) {
- Set<ParticipantId> participantSet = new HashSet<ParticipantId>(participantMap.keySet());
- Set<ParticipantId> disabledParticipantsForPartition =
- Sets.filter(participantSet, new Predicate<ParticipantId>() {
- @Override
- public boolean apply(ParticipantId participantId) {
- Participant participant = participantMap.get(participantId);
- return !participant.isEnabled()
- || participant.getDisabledPartitionIds().contains(partitionId);
- }
- });
- return disabledParticipantsForPartition;
- }
-
- /**
- * Get an ordered list of participants that can serve a partition
- * @param cluster cluster snapshot
- * @param partitionId the partition to look up
- * @param config rebalancing constraints
- * @return list with most preferred participants first
- */
- public static List<ParticipantId> getPreferenceList(Cluster cluster, PartitionId partitionId,
- List<ParticipantId> prefList) {
- if (prefList != null && prefList.size() == 1
- && StateModelToken.ANY_LIVEINSTANCE.toString().equals(prefList.get(0).stringify())) {
- prefList = new ArrayList<ParticipantId>(cluster.getLiveParticipantMap().keySet());
- Collections.sort(prefList);
- }
- return prefList;
- }
-
- /**
- * Get a map of state to upper bound constraint given a cluster
- * @param stateModelDef the state model definition to check
- * @param resourceId the resource that is constraint
- * @param cluster the cluster the resource belongs to
- * @return map of state to upper bound
- */
- public static Map<State, String> stateConstraints(StateModelDefinition stateModelDef,
- ResourceId resourceId, ClusterConfig cluster) {
- Map<State, String> stateMap = Maps.newHashMap();
- for (State state : stateModelDef.getTypedStatesPriorityList()) {
- String num =
- cluster.getStateUpperBoundConstraint(Scope.resource(resourceId),
- stateModelDef.getStateModelDefId(), state);
- stateMap.put(state, num);
- }
- return stateMap;
- }
-
- /**
- * compute best state for resource in SEMI_AUTO and FULL_AUTO modes
- * @param upperBounds map of state to upper bound
- * @param liveParticipantSet set of live participant ids
- * @param stateModelDef
- * @param participantPreferenceList
- * @param currentStateMap
- * : participant->state for each partition
- * @param disabledParticipantsForPartition
- * @return
- */
- public static Map<ParticipantId, State> computeAutoBestStateForPartition(
- Map<State, String> upperBounds, Set<ParticipantId> liveParticipantSet,
- StateModelDefinition stateModelDef, List<ParticipantId> participantPreferenceList,
- Map<ParticipantId, State> currentStateMap, Set<ParticipantId> disabledParticipantsForPartition) {
- Map<ParticipantId, State> participantStateMap = new HashMap<ParticipantId, State>();
-
- // if the resource is deleted, instancePreferenceList will be empty and
- // we should drop all resources.
- if (currentStateMap != null) {
- for (ParticipantId participantId : currentStateMap.keySet()) {
- if ((participantPreferenceList == null || !participantPreferenceList
- .contains(participantId)) && !disabledParticipantsForPartition.contains(participantId)) {
- // if dropped and not disabled, transit to DROPPED
- participantStateMap.put(participantId, State.from(HelixDefinedState.DROPPED));
- } else if ((currentStateMap.get(participantId) == null || !currentStateMap.get(
- participantId).equals(State.from(HelixDefinedState.ERROR)))
- && disabledParticipantsForPartition.contains(participantId)) {
- // if disabled and not in ERROR state, transit to initial-state (e.g. OFFLINE)
- participantStateMap.put(participantId, stateModelDef.getTypedInitialState());
- }
- }
- }
-
- // resource is deleted
- if (participantPreferenceList == null) {
- return participantStateMap;
- }
-
- List<State> statesPriorityList = stateModelDef.getTypedStatesPriorityList();
- boolean assigned[] = new boolean[participantPreferenceList.size()];
-
- for (State state : statesPriorityList) {
- String num = upperBounds.get(state);
- int stateCount = -1;
- if ("N".equals(num)) {
- Set<ParticipantId> liveAndEnabled = new HashSet<ParticipantId>(liveParticipantSet);
- liveAndEnabled.removeAll(disabledParticipantsForPartition);
- stateCount = liveAndEnabled.size();
- } else if ("R".equals(num)) {
- stateCount = participantPreferenceList.size();
- } else {
- try {
- stateCount = Integer.parseInt(num);
- } catch (Exception e) {
- logger.error("Invalid count for state:" + state + " ,count=" + num);
- }
- }
- if (stateCount > -1) {
- int count = 0;
- for (int i = 0; i < participantPreferenceList.size(); i++) {
- ParticipantId participantId = participantPreferenceList.get(i);
-
- boolean notInErrorState =
- currentStateMap == null
- || currentStateMap.get(participantId) == null
- || !currentStateMap.get(participantId)
- .equals(State.from(HelixDefinedState.ERROR));
-
- if (liveParticipantSet.contains(participantId) && !assigned[i] && notInErrorState
- && !disabledParticipantsForPartition.contains(participantId)) {
- participantStateMap.put(participantId, state);
- count = count + 1;
- assigned[i] = true;
- if (count == stateCount) {
- break;
- }
- }
- }
- }
- }
- return participantStateMap;
- }
-
- /**
- * Get the number of replicas that should be in each state for a partition
- * @param upperBounds map of state to upper bound
- * @param stateModelDef StateModelDefinition object
- * @param liveNodesNb number of live nodes
- * @param total number of replicas
- * @return state count map: state->count
- */
- public static LinkedHashMap<State, Integer> stateCount(Map<State, String> upperBounds,
- StateModelDefinition stateModelDef, int liveNodesNb, int totalReplicas) {
- LinkedHashMap<State, Integer> stateCountMap = new LinkedHashMap<State, Integer>();
- List<State> statesPriorityList = stateModelDef.getTypedStatesPriorityList();
-
- int replicas = totalReplicas;
- for (State state : statesPriorityList) {
- String num = upperBounds.get(state);
- if ("N".equals(num)) {
- stateCountMap.put(state, liveNodesNb);
- } else if ("R".equals(num)) {
- // wait until we get the counts for all other states
- continue;
- } else {
- int stateCount = -1;
- try {
- stateCount = Integer.parseInt(num);
- } catch (Exception e) {
- // LOG.error("Invalid count for state: " + state + ", count: " + num +
- // ", use -1 instead");
- }
-
- if (stateCount > 0) {
- stateCountMap.put(state, stateCount);
- replicas -= stateCount;
- }
- }
- }
-
- // get state count for R
- for (State state : statesPriorityList) {
- String num = upperBounds.get(state);
- if ("R".equals(num)) {
- stateCountMap.put(state, replicas);
- // should have at most one state using R
- break;
- }
- }
- return stateCountMap;
- }
-}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/AutoRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/AutoRebalancer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/AutoRebalancer.java
deleted file mode 100644
index 880f2c0..0000000
--- a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/AutoRebalancer.java
+++ /dev/null
@@ -1,187 +0,0 @@
-package org.apache.helix.controller.rebalancer;
-
-/*
- * 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.
- */
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.helix.HelixManager;
-import org.apache.helix.ZNRecord;
-import org.apache.helix.api.id.PartitionId;
-import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
-import org.apache.helix.controller.stages.ClusterDataCache;
-import org.apache.helix.controller.stages.CurrentStateOutput;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy.DefaultPlacementScheme;
-import org.apache.helix.controller.strategy.AutoRebalanceStrategy.ReplicaPlacementScheme;
-import org.apache.helix.model.IdealState;
-import org.apache.helix.model.IdealState.RebalanceMode;
-import org.apache.helix.model.LiveInstance;
-import org.apache.helix.model.Partition;
-import org.apache.helix.model.Resource;
-import org.apache.helix.model.ResourceAssignment;
-import org.apache.helix.model.StateModelDefinition;
-import org.apache.log4j.Logger;
-
-/**
- * This is a Rebalancer specific to full automatic mode. It is tasked with computing the ideal
- * state of a resource, fully adapting to the addition or removal of instances. This includes
- * computation of a new preference list and a partition to instance and state mapping based on the
- * computed instance preferences.
- * The input is the current assignment of partitions to instances, as well as existing instance
- * preferences, if any.
- * The output is a preference list and a mapping based on that preference list, i.e. partition p
- * has a replica on node k with state s.
- */
-@Deprecated
-public class AutoRebalancer implements Rebalancer {
- // These should be final, but are initialized in init rather than a constructor
- private HelixManager _manager;
- private AutoRebalanceStrategy _algorithm;
-
- private static final Logger LOG = Logger.getLogger(AutoRebalancer.class);
-
- @Override
- public void init(HelixManager manager) {
- this._manager = manager;
- this._algorithm = null;
- }
-
- @Override
- public ResourceAssignment computeResourceMapping(Resource resource, IdealState currentIdealState,
- CurrentStateOutput currentStateOutput, ClusterDataCache clusterData) {
- // Compute a preference list based on the current ideal state
- List<String> partitions = new ArrayList<String>(currentIdealState.getPartitionSet());
- String stateModelName = currentIdealState.getStateModelDefRef();
- StateModelDefinition stateModelDef = clusterData.getStateModelDef(stateModelName);
- Map<String, LiveInstance> liveInstance = clusterData.getLiveInstances();
- String replicas = currentIdealState.getReplicas();
-
- LinkedHashMap<String, Integer> stateCountMap = new LinkedHashMap<String, Integer>();
- stateCountMap =
- ConstraintBasedAssignment.stateCount(stateModelDef, liveInstance.size(),
- Integer.parseInt(replicas));
- List<String> liveNodes = new ArrayList<String>(liveInstance.keySet());
- Map<String, Map<String, String>> currentMapping =
- currentMapping(currentStateOutput, resource.getResourceName(), partitions, stateCountMap);
-
- // If there are nodes tagged with resource name, use only those nodes
- Set<String> taggedNodes = new HashSet<String>();
- if (currentIdealState.getInstanceGroupTag() != null) {
- for (String instanceName : liveNodes) {
- if (clusterData.getInstanceConfigMap().get(instanceName)
- .containsTag(currentIdealState.getInstanceGroupTag())) {
- taggedNodes.add(instanceName);
- }
- }
- }
- if (taggedNodes.size() > 0) {
- if (LOG.isInfoEnabled()) {
- LOG.info("found the following instances with tag " + currentIdealState.getResourceName()
- + " " + taggedNodes);
- }
- liveNodes = new ArrayList<String>(taggedNodes);
- }
-
- List<String> allNodes = new ArrayList<String>(clusterData.getInstanceConfigMap().keySet());
- int maxPartition = currentIdealState.getMaxPartitionsPerInstance();
-
- if (LOG.isInfoEnabled()) {
- LOG.info("currentMapping: " + currentMapping);
- LOG.info("stateCountMap: " + stateCountMap);
- LOG.info("liveNodes: " + liveNodes);
- LOG.info("allNodes: " + allNodes);
- LOG.info("maxPartition: " + maxPartition);
- }
- ReplicaPlacementScheme placementScheme = new DefaultPlacementScheme();
- placementScheme.init(_manager);
- _algorithm =
- new AutoRebalanceStrategy(resource.getResourceName(), partitions, stateCountMap,
- maxPartition, placementScheme);
- ZNRecord newMapping =
- _algorithm.computePartitionAssignment(liveNodes, currentMapping, allNodes);
-
- if (LOG.isInfoEnabled()) {
- LOG.info("newMapping: " + newMapping);
- }
-
- IdealState newIdealState = new IdealState(resource.getResourceName());
- newIdealState.getRecord().setSimpleFields(currentIdealState.getRecord().getSimpleFields());
- newIdealState.setRebalanceMode(RebalanceMode.FULL_AUTO);
- newIdealState.getRecord().setListFields(newMapping.getListFields());
-
- // compute a full partition mapping for the resource
- if (LOG.isDebugEnabled()) {
- LOG.debug("Processing resource:" + resource.getResourceName());
- }
- ResourceAssignment partitionMapping =
- new ResourceAssignment(ResourceId.from(resource.getResourceName()));
- for (String partitionName : partitions) {
- Partition partition = new Partition(partitionName);
- Map<String, String> currentStateMap =
- currentStateOutput.getCurrentStateMap(resource.getResourceName(), partition);
- Set<String> disabledInstancesForPartition =
- clusterData.getDisabledInstancesForPartition(partition.toString());
- List<String> preferenceList =
- ConstraintBasedAssignment.getPreferenceList(clusterData, partition, newIdealState,
- stateModelDef);
- Map<String, String> bestStateForPartition =
- ConstraintBasedAssignment.computeAutoBestStateForPartition(clusterData, stateModelDef,
- preferenceList, currentStateMap, disabledInstancesForPartition);
- partitionMapping.addReplicaMap(PartitionId.from(partitionName),
- ResourceAssignment.replicaMapFromStringMap(bestStateForPartition));
- }
- return partitionMapping;
- }
-
- private Map<String, Map<String, String>> currentMapping(CurrentStateOutput currentStateOutput,
- String resourceName, List<String> partitions, Map<String, Integer> stateCountMap) {
-
- Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();
-
- for (String partition : partitions) {
- Map<String, String> curStateMap =
- currentStateOutput.getCurrentStateMap(resourceName, new Partition(partition));
- map.put(partition, new HashMap<String, String>());
- for (String node : curStateMap.keySet()) {
- String state = curStateMap.get(node);
- if (stateCountMap.containsKey(state)) {
- map.get(partition).put(node, state);
- }
- }
-
- Map<String, String> pendingStateMap =
- currentStateOutput.getPendingStateMap(resourceName, new Partition(partition));
- for (String node : pendingStateMap.keySet()) {
- String state = pendingStateMap.get(node);
- if (stateCountMap.containsKey(state)) {
- map.get(partition).put(node, state);
- }
- }
- }
- return map;
- }
-}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/CustomRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/CustomRebalancer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/CustomRebalancer.java
index f6ea60f..ac4d328 100644
--- a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/CustomRebalancer.java
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/CustomRebalancer.java
@@ -1,5 +1,23 @@
package org.apache.helix.controller.rebalancer;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.helix.HelixDefinedState;
+import org.apache.helix.HelixManager;
+import org.apache.helix.api.Cluster;
+import org.apache.helix.api.State;
+import org.apache.helix.api.id.ParticipantId;
+import org.apache.helix.api.id.PartitionId;
+import org.apache.helix.controller.rebalancer.context.CustomRebalancerContext;
+import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
+import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
+import org.apache.helix.controller.stages.ResourceCurrentState;
+import org.apache.helix.model.ResourceAssignment;
+import org.apache.helix.model.StateModelDefinition;
+import org.apache.log4j.Logger;
+
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
@@ -19,117 +37,89 @@ package org.apache.helix.controller.rebalancer;
* under the License.
*/
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.helix.HelixDefinedState;
-import org.apache.helix.HelixManager;
-import org.apache.helix.api.id.PartitionId;
-import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.controller.stages.ClusterDataCache;
-import org.apache.helix.controller.stages.CurrentStateOutput;
-import org.apache.helix.model.IdealState;
-import org.apache.helix.model.LiveInstance;
-import org.apache.helix.model.Partition;
-import org.apache.helix.model.Resource;
-import org.apache.helix.model.ResourceAssignment;
-import org.apache.helix.model.StateModelDefinition;
-import org.apache.log4j.Logger;
-
-/**
- * This is a Rebalancer specific to custom mode. It is tasked with checking an existing mapping of
- * partitions against the set of live instances to mark assignment states as dropped or erroneous
- * as necessary.
- * The input is the required current assignment of partitions to instances, as well as the required
- * existing instance preferences.
- * The output is a verified mapping based on that preference list, i.e. partition p has a replica
- * on node k with state s, where s may be a dropped or error state if necessary.
- */
-@Deprecated
public class CustomRebalancer implements Rebalancer {
private static final Logger LOG = Logger.getLogger(CustomRebalancer.class);
@Override
- public void init(HelixManager manager) {
+ public void init(HelixManager helixManager) {
+ // do nothing
}
@Override
- public ResourceAssignment computeResourceMapping(Resource resource, IdealState currentIdealState,
- CurrentStateOutput currentStateOutput, ClusterDataCache clusterData) {
- String stateModelDefName = currentIdealState.getStateModelDefRef();
- StateModelDefinition stateModelDef = clusterData.getStateModelDef(stateModelDefName);
+ public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig,
+ Cluster cluster, ResourceCurrentState currentState) {
+ CustomRebalancerContext config =
+ rebalancerConfig.getRebalancerContext(CustomRebalancerContext.class);
+ StateModelDefinition stateModelDef =
+ cluster.getStateModelMap().get(config.getStateModelDefId());
if (LOG.isDebugEnabled()) {
- LOG.debug("Processing resource:" + resource.getResourceName());
+ LOG.debug("Processing resource:" + config.getResourceId());
}
- ResourceAssignment partitionMapping =
- new ResourceAssignment(ResourceId.from(resource.getResourceName()));
- for (Partition partition : resource.getPartitions()) {
- Map<String, String> currentStateMap =
- currentStateOutput.getCurrentStateMap(resource.getResourceName(), partition);
- Set<String> disabledInstancesForPartition =
- clusterData.getDisabledInstancesForPartition(partition.toString());
- Map<String, String> idealStateMap =
- IdealState.stringMapFromParticipantStateMap(currentIdealState
- .getParticipantStateMap(PartitionId.from(partition.getPartitionName())));
- Map<String, String> bestStateForPartition =
- computeCustomizedBestStateForPartition(clusterData, stateModelDef, idealStateMap,
- currentStateMap, disabledInstancesForPartition);
- partitionMapping.addReplicaMap(PartitionId.from(partition.getPartitionName()),
- ResourceAssignment.replicaMapFromStringMap(bestStateForPartition));
+ ResourceAssignment partitionMapping = new ResourceAssignment(config.getResourceId());
+ for (PartitionId partition : config.getPartitionSet()) {
+ Map<ParticipantId, State> currentStateMap =
+ currentState.getCurrentStateMap(config.getResourceId(), partition);
+ Set<ParticipantId> disabledInstancesForPartition =
+ ConstraintBasedAssignment.getDisabledParticipants(cluster.getParticipantMap(),
+ partition);
+ Map<ParticipantId, State> bestStateForPartition =
+ computeCustomizedBestStateForPartition(cluster.getLiveParticipantMap().keySet(),
+ stateModelDef, config.getPreferenceMap(partition), currentStateMap,
+ disabledInstancesForPartition);
+ partitionMapping.addReplicaMap(partition, bestStateForPartition);
}
return partitionMapping;
}
/**
- * compute best state for resource in CUSTOMIZED ideal state mode
- * @param cache
+ * compute best state for resource in CUSTOMIZED rebalancer mode
+ * @param liveParticipantMap
* @param stateModelDef
- * @param idealStateMap
+ * @param preferenceMap
* @param currentStateMap
- * @param disabledInstancesForPartition
+ * @param disabledParticipantsForPartition
* @return
*/
- private Map<String, String> computeCustomizedBestStateForPartition(ClusterDataCache cache,
- StateModelDefinition stateModelDef, Map<String, String> idealStateMap,
- Map<String, String> currentStateMap, Set<String> disabledInstancesForPartition) {
- Map<String, String> instanceStateMap = new HashMap<String, String>();
+ private Map<ParticipantId, State> computeCustomizedBestStateForPartition(
+ Set<ParticipantId> liveParticipantSet, StateModelDefinition stateModelDef,
+ Map<ParticipantId, State> preferenceMap, Map<ParticipantId, State> currentStateMap,
+ Set<ParticipantId> disabledParticipantsForPartition) {
+ Map<ParticipantId, State> participantStateMap = new HashMap<ParticipantId, State>();
- // if the ideal state is deleted, idealStateMap will be null/empty and
+ // if the resource is deleted, idealStateMap will be null/empty and
// we should drop all resources.
if (currentStateMap != null) {
- for (String instance : currentStateMap.keySet()) {
- if ((idealStateMap == null || !idealStateMap.containsKey(instance))
- && !disabledInstancesForPartition.contains(instance)) {
+ for (ParticipantId participantId : currentStateMap.keySet()) {
+ if ((preferenceMap == null || !preferenceMap.containsKey(participantId))
+ && !disabledParticipantsForPartition.contains(participantId)) {
// if dropped and not disabled, transit to DROPPED
- instanceStateMap.put(instance, HelixDefinedState.DROPPED.toString());
- } else if ((currentStateMap.get(instance) == null || !currentStateMap.get(instance).equals(
- HelixDefinedState.ERROR.toString()))
- && disabledInstancesForPartition.contains(instance)) {
+ participantStateMap.put(participantId, State.from(HelixDefinedState.DROPPED));
+ } else if ((currentStateMap.get(participantId) == null || !currentStateMap.get(
+ participantId).equals(State.from(HelixDefinedState.ERROR)))
+ && disabledParticipantsForPartition.contains(participantId)) {
// if disabled and not in ERROR state, transit to initial-state (e.g. OFFLINE)
- instanceStateMap.put(instance, stateModelDef.getInitialState());
+ participantStateMap.put(participantId, stateModelDef.getTypedInitialState());
}
}
}
// ideal state is deleted
- if (idealStateMap == null) {
- return instanceStateMap;
+ if (preferenceMap == null) {
+ return participantStateMap;
}
- Map<String, LiveInstance> liveInstancesMap = cache.getLiveInstances();
- for (String instance : idealStateMap.keySet()) {
+ for (ParticipantId participantId : preferenceMap.keySet()) {
boolean notInErrorState =
- currentStateMap == null || currentStateMap.get(instance) == null
- || !currentStateMap.get(instance).equals(HelixDefinedState.ERROR.toString());
+ currentStateMap == null || currentStateMap.get(participantId) == null
+ || !currentStateMap.get(participantId).equals(State.from(HelixDefinedState.ERROR));
- if (liveInstancesMap.containsKey(instance) && notInErrorState
- && !disabledInstancesForPartition.contains(instance)) {
- instanceStateMap.put(instance, idealStateMap.get(instance));
+ if (liveParticipantSet.contains(participantId) && notInErrorState
+ && !disabledParticipantsForPartition.contains(participantId)) {
+ participantStateMap.put(participantId, preferenceMap.get(participantId));
}
}
- return instanceStateMap;
+ return participantStateMap;
}
}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/FullAutoRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/FullAutoRebalancer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/FullAutoRebalancer.java
new file mode 100644
index 0000000..b0c11d4
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/FullAutoRebalancer.java
@@ -0,0 +1,196 @@
+package org.apache.helix.controller.rebalancer;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.helix.HelixManager;
+import org.apache.helix.ZNRecord;
+import org.apache.helix.api.Cluster;
+import org.apache.helix.api.Participant;
+import org.apache.helix.api.State;
+import org.apache.helix.api.id.ParticipantId;
+import org.apache.helix.api.id.PartitionId;
+import org.apache.helix.controller.rebalancer.context.FullAutoRebalancerContext;
+import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
+import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
+import org.apache.helix.controller.stages.ResourceCurrentState;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy.DefaultPlacementScheme;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy.ReplicaPlacementScheme;
+import org.apache.helix.model.ResourceAssignment;
+import org.apache.helix.model.StateModelDefinition;
+import org.apache.log4j.Logger;
+
+import com.google.common.base.Function;
+import com.google.common.collect.Lists;
+
+/*
+ * 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.
+ */
+
+public class FullAutoRebalancer implements Rebalancer {
+ // These should be final, but are initialized in init rather than a constructor
+ private AutoRebalanceStrategy _algorithm;
+
+ private static Logger LOG = Logger.getLogger(FullAutoRebalancer.class);
+
+ @Override
+ public void init(HelixManager helixManager) {
+ // do nothing
+ }
+
+ @Override
+ public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig,
+ Cluster cluster, ResourceCurrentState currentState) {
+ FullAutoRebalancerContext config =
+ rebalancerConfig.getRebalancerContext(FullAutoRebalancerContext.class);
+ StateModelDefinition stateModelDef =
+ cluster.getStateModelMap().get(config.getStateModelDefId());
+ // Compute a preference list based on the current ideal state
+ List<PartitionId> partitions = new ArrayList<PartitionId>(config.getPartitionSet());
+ Map<ParticipantId, Participant> liveParticipants = cluster.getLiveParticipantMap();
+ Map<ParticipantId, Participant> allParticipants = cluster.getParticipantMap();
+ int replicas = -1;
+ if (config.anyLiveParticipant()) {
+ replicas = liveParticipants.size();
+ } else {
+ replicas = config.getReplicaCount();
+ }
+
+ // count how many replicas should be in each state
+ Map<State, String> upperBounds =
+ ConstraintBasedAssignment.stateConstraints(stateModelDef, config.getResourceId(),
+ cluster.getConfig());
+ LinkedHashMap<State, Integer> stateCountMap =
+ ConstraintBasedAssignment.stateCount(upperBounds, stateModelDef,
+ liveParticipants.size(), replicas);
+
+ // get the participant lists
+ List<ParticipantId> liveParticipantList =
+ new ArrayList<ParticipantId>(liveParticipants.keySet());
+ List<ParticipantId> allParticipantList =
+ new ArrayList<ParticipantId>(cluster.getParticipantMap().keySet());
+
+ // compute the current mapping from the current state
+ Map<PartitionId, Map<ParticipantId, State>> currentMapping =
+ currentMapping(config, currentState, stateCountMap);
+
+ // If there are nodes tagged with resource, use only those nodes
+ Set<ParticipantId> taggedNodes = new HashSet<ParticipantId>();
+ if (config.getParticipantGroupTag() != null) {
+ for (ParticipantId participantId : liveParticipantList) {
+ if (liveParticipants.get(participantId).hasTag(config.getParticipantGroupTag())) {
+ taggedNodes.add(participantId);
+ }
+ }
+ }
+ if (taggedNodes.size() > 0) {
+ if (LOG.isInfoEnabled()) {
+ LOG.info("found the following instances with tag " + config.getResourceId() + " "
+ + taggedNodes);
+ }
+ liveParticipantList = new ArrayList<ParticipantId>(taggedNodes);
+ }
+
+ // determine which nodes the replicas should live on
+ int maxPartition = config.getMaxPartitionsPerParticipant();
+ if (LOG.isInfoEnabled()) {
+ LOG.info("currentMapping: " + currentMapping);
+ LOG.info("stateCountMap: " + stateCountMap);
+ LOG.info("liveNodes: " + liveParticipantList);
+ LOG.info("allNodes: " + allParticipantList);
+ LOG.info("maxPartition: " + maxPartition);
+ }
+ ReplicaPlacementScheme placementScheme = new DefaultPlacementScheme();
+ _algorithm =
+ new AutoRebalanceStrategy(config.getResourceId(), partitions, stateCountMap, maxPartition,
+ placementScheme);
+ ZNRecord newMapping =
+ _algorithm.typedComputePartitionAssignment(liveParticipantList, currentMapping,
+ allParticipantList);
+
+ if (LOG.isInfoEnabled()) {
+ LOG.info("newMapping: " + newMapping);
+ }
+
+ // compute a full partition mapping for the resource
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Processing resource:" + config.getResourceId());
+ }
+ ResourceAssignment partitionMapping = new ResourceAssignment(config.getResourceId());
+ for (PartitionId partition : partitions) {
+ Set<ParticipantId> disabledParticipantsForPartition =
+ ConstraintBasedAssignment.getDisabledParticipants(allParticipants, partition);
+ List<String> rawPreferenceList = newMapping.getListField(partition.stringify());
+ if (rawPreferenceList == null) {
+ rawPreferenceList = Collections.emptyList();
+ }
+ List<ParticipantId> preferenceList =
+ Lists.transform(rawPreferenceList, new Function<String, ParticipantId>() {
+ @Override
+ public ParticipantId apply(String participantName) {
+ return ParticipantId.from(participantName);
+ }
+ });
+ preferenceList =
+ ConstraintBasedAssignment.getPreferenceList(cluster, partition, preferenceList);
+ Map<ParticipantId, State> bestStateForPartition =
+ ConstraintBasedAssignment.computeAutoBestStateForPartition(upperBounds,
+ liveParticipants.keySet(), stateModelDef, preferenceList,
+ currentState.getCurrentStateMap(config.getResourceId(), partition),
+ disabledParticipantsForPartition);
+ partitionMapping.addReplicaMap(partition, bestStateForPartition);
+ }
+ return partitionMapping;
+ }
+
+ private Map<PartitionId, Map<ParticipantId, State>> currentMapping(
+ FullAutoRebalancerContext config, ResourceCurrentState currentStateOutput,
+ Map<State, Integer> stateCountMap) {
+ Map<PartitionId, Map<ParticipantId, State>> map =
+ new HashMap<PartitionId, Map<ParticipantId, State>>();
+
+ for (PartitionId partition : config.getPartitionSet()) {
+ Map<ParticipantId, State> curStateMap =
+ currentStateOutput.getCurrentStateMap(config.getResourceId(), partition);
+ map.put(partition, new HashMap<ParticipantId, State>());
+ for (ParticipantId node : curStateMap.keySet()) {
+ State state = curStateMap.get(node);
+ if (stateCountMap.containsKey(state)) {
+ map.get(partition).put(node, state);
+ }
+ }
+
+ Map<ParticipantId, State> pendingStateMap =
+ currentStateOutput.getPendingStateMap(config.getResourceId(), partition);
+ for (ParticipantId node : pendingStateMap.keySet()) {
+ State state = pendingStateMap.get(node);
+ if (stateCountMap.containsKey(state)) {
+ map.get(partition).put(node, state);
+ }
+ }
+ }
+ return map;
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/Rebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/Rebalancer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/Rebalancer.java
index 26fc2ef..5a6a24e 100644
--- a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/Rebalancer.java
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/Rebalancer.java
@@ -1,5 +1,11 @@
package org.apache.helix.controller.rebalancer;
+import org.apache.helix.HelixManager;
+import org.apache.helix.api.Cluster;
+import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
+import org.apache.helix.controller.stages.ResourceCurrentState;
+import org.apache.helix.model.ResourceAssignment;
+
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
@@ -19,40 +25,15 @@ package org.apache.helix.controller.rebalancer;
* under the License.
*/
-import org.apache.helix.HelixManager;
-import org.apache.helix.controller.stages.ClusterDataCache;
-import org.apache.helix.controller.stages.CurrentStateOutput;
-import org.apache.helix.model.IdealState;
-import org.apache.helix.model.Resource;
-import org.apache.helix.model.ResourceAssignment;
-
/**
* Allows one to come up with custom implementation of a rebalancer.<br/>
* This will be invoked on all changes that happen in the cluster.<br/>
- * Simply return the newIdealState for a resource in this method.<br/>
- * <br/>
- * Deprecated. Use {@link org.apache.helix.api.rebalancer.Rebalancer} instead.
+ * Simply return the resource assignment for a resource in this method.<br/>
*/
-@Deprecated
public interface Rebalancer {
- /**
- * Initialize the rebalancer with a HelixManager if necessary
- * @param manager
- */
- void init(HelixManager manager);
- /**
- * Given an ideal state for a resource and liveness of instances, compute a assignment of
- * instances and states to each partition of a resource. This method provides all the relevant
- * information needed to rebalance a resource. If you need additional information use
- * manager.getAccessor to read the cluster data. This allows one to compute the newIdealState
- * according to app specific requirements.
- * @param resourceName the resource for which a mapping will be computed
- * @param currentIdealState the IdealState that corresponds to this resource
- * @param currentStateOutput the current states of all partitions
- * @param clusterData cache of the cluster state
- */
- ResourceAssignment computeResourceMapping(final Resource resource,
- final IdealState currentIdealState, final CurrentStateOutput currentStateOutput,
- final ClusterDataCache clusterData);
+ public void init(HelixManager helixManager);
+
+ public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig, Cluster cluster,
+ ResourceCurrentState currentState);
}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/RebalancerRef.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/RebalancerRef.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/RebalancerRef.java
new file mode 100644
index 0000000..79e4ba0
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/RebalancerRef.java
@@ -0,0 +1,94 @@
+package org.apache.helix.controller.rebalancer;
+
+/*
+ * 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.
+ */
+
+import org.apache.helix.util.HelixUtil;
+import org.apache.log4j.Logger;
+import org.codehaus.jackson.annotate.JsonCreator;
+import org.codehaus.jackson.annotate.JsonIgnore;
+import org.codehaus.jackson.annotate.JsonProperty;
+
+/**
+ * Reference to a class that extends {@link Rebalancer}. It loads the class automatically.
+ */
+public class RebalancerRef {
+ private static final Logger LOG = Logger.getLogger(RebalancerRef.class);
+
+ @JsonProperty("rebalancerClassName")
+ private final String _rebalancerClassName;
+
+ @JsonCreator
+ private RebalancerRef(@JsonProperty("rebalancerClassName") String rebalancerClassName) {
+ _rebalancerClassName = rebalancerClassName;
+ }
+
+ /**
+ * Get an instantiated Rebalancer
+ * @return Rebalancer or null if instantiation failed
+ */
+ @JsonIgnore
+ public Rebalancer getRebalancer() {
+ try {
+ return (Rebalancer) (HelixUtil.loadClass(getClass(), _rebalancerClassName).newInstance());
+ } catch (Exception e) {
+ LOG.warn("Exception while invoking custom rebalancer class:" + _rebalancerClassName, e);
+ }
+ return null;
+ }
+
+ @Override
+ public String toString() {
+ return _rebalancerClassName;
+ }
+
+ @Override
+ public boolean equals(Object that) {
+ if (that instanceof RebalancerRef) {
+ return this.toString().equals(((RebalancerRef) that).toString());
+ } else if (that instanceof String) {
+ return this.toString().equals(that);
+ }
+ return false;
+ }
+
+ /**
+ * Get a rebalancer class reference
+ * @param rebalancerClassName name of the class
+ * @return RebalancerRef or null if name is null
+ */
+ public static RebalancerRef from(String rebalancerClassName) {
+ if (rebalancerClassName == null) {
+ return null;
+ }
+ return new RebalancerRef(rebalancerClassName);
+ }
+
+ /**
+ * Get a RebalancerRef from a class object
+ * @param rebalancerClass class that implements Rebalancer
+ * @return RebalancerRef
+ */
+ public static RebalancerRef from(Class<? extends Rebalancer> rebalancerClass) {
+ if (rebalancerClass == null) {
+ return null;
+ }
+ return RebalancerRef.from(rebalancerClass.getName());
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/SemiAutoRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/SemiAutoRebalancer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/SemiAutoRebalancer.java
index dd9fcf1..96e3d4b 100644
--- a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/SemiAutoRebalancer.java
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/SemiAutoRebalancer.java
@@ -1,5 +1,22 @@
package org.apache.helix.controller.rebalancer;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.helix.HelixManager;
+import org.apache.helix.api.Cluster;
+import org.apache.helix.api.State;
+import org.apache.helix.api.id.ParticipantId;
+import org.apache.helix.api.id.PartitionId;
+import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
+import org.apache.helix.controller.rebalancer.context.SemiAutoRebalancerContext;
+import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
+import org.apache.helix.controller.stages.ResourceCurrentState;
+import org.apache.helix.model.ResourceAssignment;
+import org.apache.helix.model.StateModelDefinition;
+import org.apache.log4j.Logger;
+
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
@@ -19,65 +36,48 @@ package org.apache.helix.controller.rebalancer;
* under the License.
*/
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.helix.HelixManager;
-import org.apache.helix.api.id.PartitionId;
-import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
-import org.apache.helix.controller.stages.ClusterDataCache;
-import org.apache.helix.controller.stages.CurrentStateOutput;
-import org.apache.helix.model.IdealState;
-import org.apache.helix.model.Partition;
-import org.apache.helix.model.Resource;
-import org.apache.helix.model.ResourceAssignment;
-import org.apache.helix.model.StateModelDefinition;
-import org.apache.log4j.Logger;
-
/**
- * This is a Rebalancer specific to semi-automatic mode. It is tasked with computing the ideal
- * state of a resource based on a predefined preference list of instances willing to accept
- * replicas.
- * The input is the optional current assignment of partitions to instances, as well as the required
- * existing instance preferences.
- * The output is a mapping based on that preference list, i.e. partition p has a replica on node k
- * with state s.
+ * Rebalancer for the SEMI_AUTO mode. It expects a RebalancerConfig that understands the preferred
+ * locations of each partition replica
*/
-@Deprecated
public class SemiAutoRebalancer implements Rebalancer {
-
private static final Logger LOG = Logger.getLogger(SemiAutoRebalancer.class);
@Override
- public void init(HelixManager manager) {
+ public void init(HelixManager helixManager) {
+ // do nothing
}
@Override
- public ResourceAssignment computeResourceMapping(Resource resource, IdealState currentIdealState,
- CurrentStateOutput currentStateOutput, ClusterDataCache clusterData) {
- String stateModelDefName = currentIdealState.getStateModelDefRef();
- StateModelDefinition stateModelDef = clusterData.getStateModelDef(stateModelDefName);
+ public ResourceAssignment computeResourceMapping(RebalancerConfig rebalancerConfig,
+ Cluster cluster, ResourceCurrentState currentState) {
+ SemiAutoRebalancerContext config =
+ rebalancerConfig.getRebalancerContext(SemiAutoRebalancerContext.class);
+ StateModelDefinition stateModelDef =
+ cluster.getStateModelMap().get(config.getStateModelDefId());
if (LOG.isDebugEnabled()) {
- LOG.debug("Processing resource:" + resource.getResourceName());
+ LOG.debug("Processing resource:" + config.getResourceId());
}
- ResourceAssignment partitionMapping =
- new ResourceAssignment(ResourceId.from(resource.getResourceName()));
- for (Partition partition : resource.getPartitions()) {
- Map<String, String> currentStateMap =
- currentStateOutput.getCurrentStateMap(resource.getResourceName(), partition);
- Set<String> disabledInstancesForPartition =
- clusterData.getDisabledInstancesForPartition(partition.toString());
- List<String> preferenceList =
- ConstraintBasedAssignment.getPreferenceList(clusterData, partition, currentIdealState,
- stateModelDef);
- Map<String, String> bestStateForPartition =
- ConstraintBasedAssignment.computeAutoBestStateForPartition(clusterData, stateModelDef,
- preferenceList, currentStateMap, disabledInstancesForPartition);
- partitionMapping.addReplicaMap(PartitionId.from(partition.getPartitionName()),
- ResourceAssignment.replicaMapFromStringMap(bestStateForPartition));
+ ResourceAssignment partitionMapping = new ResourceAssignment(config.getResourceId());
+ for (PartitionId partition : config.getPartitionSet()) {
+ Map<ParticipantId, State> currentStateMap =
+ currentState.getCurrentStateMap(config.getResourceId(), partition);
+ Set<ParticipantId> disabledInstancesForPartition =
+ ConstraintBasedAssignment.getDisabledParticipants(cluster.getParticipantMap(),
+ partition);
+ List<ParticipantId> preferenceList =
+ ConstraintBasedAssignment.getPreferenceList(cluster, partition,
+ config.getPreferenceList(partition));
+ Map<State, String> upperBounds =
+ ConstraintBasedAssignment.stateConstraints(stateModelDef, config.getResourceId(),
+ cluster.getConfig());
+ Map<ParticipantId, State> bestStateForPartition =
+ ConstraintBasedAssignment.computeAutoBestStateForPartition(upperBounds, cluster
+ .getLiveParticipantMap().keySet(), stateModelDef, preferenceList, currentStateMap,
+ disabledInstancesForPartition);
+ partitionMapping.addReplicaMap(partition, bestStateForPartition);
}
return partitionMapping;
}
+
}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/BasicRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/BasicRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/BasicRebalancerContext.java
new file mode 100644
index 0000000..ec765d7
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/BasicRebalancerContext.java
@@ -0,0 +1,240 @@
+package org.apache.helix.controller.rebalancer.context;
+
+import java.util.Set;
+
+import org.apache.helix.api.Partition;
+import org.apache.helix.api.id.PartitionId;
+import org.apache.helix.api.id.ResourceId;
+import org.apache.helix.api.id.StateModelDefId;
+import org.apache.helix.api.id.StateModelFactoryId;
+import org.apache.helix.controller.rebalancer.RebalancerRef;
+import org.codehaus.jackson.annotate.JsonIgnore;
+
+/*
+ * 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.
+ */
+
+/**
+ * Abstract RebalancerContext that functions for generic subunits. Use a subclass that more
+ * concretely defines the subunits.
+ */
+public abstract class BasicRebalancerContext implements RebalancerContext {
+ private ResourceId _resourceId;
+ private StateModelDefId _stateModelDefId;
+ private StateModelFactoryId _stateModelFactoryId;
+ private String _participantGroupTag;
+ private Class<? extends ContextSerializer> _serializer;
+ private RebalancerRef _rebalancerRef;
+
+ /**
+ * Instantiate a basic rebalancer context
+ */
+ public BasicRebalancerContext() {
+ _serializer = DefaultContextSerializer.class;
+ }
+
+ @Override
+ public ResourceId getResourceId() {
+ return _resourceId;
+ }
+
+ /**
+ * Set the resource to rebalance
+ * @param resourceId resource id
+ */
+ public void setResourceId(ResourceId resourceId) {
+ _resourceId = resourceId;
+ }
+
+ @Override
+ public StateModelDefId getStateModelDefId() {
+ return _stateModelDefId;
+ }
+
+ /**
+ * Set the state model definition that the resource follows
+ * @param stateModelDefId state model definition id
+ */
+ public void setStateModelDefId(StateModelDefId stateModelDefId) {
+ _stateModelDefId = stateModelDefId;
+ }
+
+ @Override
+ public StateModelFactoryId getStateModelFactoryId() {
+ return _stateModelFactoryId;
+ }
+
+ /**
+ * Set the state model factory that the resource uses
+ * @param stateModelFactoryId state model factory id
+ */
+ public void setStateModelFactoryId(StateModelFactoryId stateModelFactoryId) {
+ _stateModelFactoryId = stateModelFactoryId;
+ }
+
+ @Override
+ public String getParticipantGroupTag() {
+ return _participantGroupTag;
+ }
+
+ /**
+ * Set a tag that participants must have in order to serve this resource
+ * @param participantGroupTag string group tag
+ */
+ public void setParticipantGroupTag(String participantGroupTag) {
+ _participantGroupTag = participantGroupTag;
+ }
+
+ /**
+ * Get the serializer. If none is provided, {@link DefaultContextSerializer} is used
+ */
+ @Override
+ public Class<? extends ContextSerializer> getSerializerClass() {
+ return _serializer;
+ }
+
+ /**
+ * Set the class that can serialize this context
+ * @param serializer serializer class that implements ContextSerializer
+ */
+ public void setSerializerClass(Class<? extends ContextSerializer> serializer) {
+ _serializer = serializer;
+ }
+
+ @Override
+ @JsonIgnore
+ public Set<? extends PartitionId> getSubUnitIdSet() {
+ return getSubUnitMap().keySet();
+ }
+
+ @Override
+ @JsonIgnore
+ public Partition getSubUnit(PartitionId subUnitId) {
+ return getSubUnitMap().get(subUnitId);
+ }
+
+ @Override
+ public RebalancerRef getRebalancerRef() {
+ return _rebalancerRef;
+ }
+
+ /**
+ * Set the reference to the class used to rebalance this resource
+ * @param rebalancerRef RebalancerRef instance
+ */
+ public void setRebalancerRef(RebalancerRef rebalancerRef) {
+ _rebalancerRef = rebalancerRef;
+ }
+
+ /**
+ * Abstract builder for the base rebalancer context
+ */
+ public static abstract class AbstractBuilder<T extends AbstractBuilder<T>> {
+ private final ResourceId _resourceId;
+ private StateModelDefId _stateModelDefId;
+ private StateModelFactoryId _stateModelFactoryId;
+ private String _participantGroupTag;
+ private Class<? extends ContextSerializer> _serializerClass;
+ private RebalancerRef _rebalancerRef;
+
+ /**
+ * Instantiate with a resource id
+ * @param resourceId resource id
+ */
+ public AbstractBuilder(ResourceId resourceId) {
+ _resourceId = resourceId;
+ _serializerClass = DefaultContextSerializer.class;
+ }
+
+ /**
+ * Set the state model definition that the resource should follow
+ * @param stateModelDefId state model definition id
+ * @return Builder
+ */
+ public T stateModelDefId(StateModelDefId stateModelDefId) {
+ _stateModelDefId = stateModelDefId;
+ return self();
+ }
+
+ /**
+ * Set the state model factory that the resource should use
+ * @param stateModelFactoryId state model factory id
+ * @return Builder
+ */
+ public T stateModelFactoryId(StateModelFactoryId stateModelFactoryId) {
+ _stateModelFactoryId = stateModelFactoryId;
+ return self();
+ }
+
+ /**
+ * Set the tag that all participants require in order to serve this resource
+ * @param participantGroupTag the tag
+ * @return Builder
+ */
+ public T participantGroupTag(String participantGroupTag) {
+ _participantGroupTag = participantGroupTag;
+ return self();
+ }
+
+ /**
+ * Set the serializer class for this rebalancer context
+ * @param serializerClass class that implements ContextSerializer
+ * @return Builder
+ */
+ public T serializerClass(Class<? extends ContextSerializer> serializerClass) {
+ _serializerClass = serializerClass;
+ return self();
+ }
+
+ /**
+ * Specify a custom class to use for rebalancing
+ * @param rebalancerRef RebalancerRef instance
+ * @return Builder
+ */
+ public T rebalancerRef(RebalancerRef rebalancerRef) {
+ _rebalancerRef = rebalancerRef;
+ return self();
+ }
+
+ /**
+ * Update an existing context with base fields
+ * @param context derived context
+ */
+ protected final void update(BasicRebalancerContext context) {
+ context.setResourceId(_resourceId);
+ context.setStateModelDefId(_stateModelDefId);
+ context.setStateModelFactoryId(_stateModelFactoryId);
+ context.setParticipantGroupTag(_participantGroupTag);
+ context.setSerializerClass(_serializerClass);
+ context.setRebalancerRef(_rebalancerRef);
+ }
+
+ /**
+ * Get a typed reference to "this" class. Final derived classes should simply return the this
+ * reference.
+ * @return this for the most specific type
+ */
+ protected abstract T self();
+
+ /**
+ * Get the rebalancer context from the built fields
+ * @return RebalancerContext
+ */
+ public abstract RebalancerContext build();
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/ContextSerializer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/ContextSerializer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/ContextSerializer.java
new file mode 100644
index 0000000..ef12a09
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/ContextSerializer.java
@@ -0,0 +1,37 @@
+package org.apache.helix.controller.rebalancer.context;
+
+/*
+ * 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.
+ */
+
+public interface ContextSerializer {
+ /**
+ * Convert a RebalancerContext object instance to a String
+ * @param data instance of the rebalancer context type
+ * @return String representing the object
+ */
+ public <T> String serialize(final T data);
+
+ /**
+ * Convert raw bytes to a generic object instance
+ * @param clazz The class represented by the deserialized string
+ * @param string String representing the object
+ * @return instance of the generic type or null if the conversion failed
+ */
+ public <T> T deserialize(final Class<T> clazz, final String string);
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/CustomRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/CustomRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/CustomRebalancerContext.java
new file mode 100644
index 0000000..1fc1cda
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/CustomRebalancerContext.java
@@ -0,0 +1,163 @@
+package org.apache.helix.controller.rebalancer.context;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.helix.api.State;
+import org.apache.helix.api.id.ParticipantId;
+import org.apache.helix.api.id.PartitionId;
+import org.apache.helix.api.id.ResourceId;
+import org.apache.helix.controller.rebalancer.CustomRebalancer;
+import org.apache.helix.controller.rebalancer.RebalancerRef;
+import org.apache.helix.controller.rebalancer.util.ConstraintBasedAssignment;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy.DefaultPlacementScheme;
+import org.apache.helix.controller.strategy.AutoRebalanceStrategy.ReplicaPlacementScheme;
+import org.apache.helix.model.IdealState.RebalanceMode;
+import org.apache.helix.model.ResourceAssignment;
+import org.apache.helix.model.StateModelDefinition;
+import org.codehaus.jackson.annotate.JsonIgnore;
+
+import com.google.common.collect.Maps;
+
+/*
+ * 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.
+ */
+
+/**
+ * RebalancerContext for a resource that should be rebalanced in CUSTOMIZED mode. By default, it
+ * corresponds to {@link CustomRebalancer}
+ */
+public class CustomRebalancerContext extends PartitionedRebalancerContext {
+ private Map<PartitionId, Map<ParticipantId, State>> _preferenceMaps;
+
+ /**
+ * Instantiate a CustomRebalancerContext
+ */
+ public CustomRebalancerContext() {
+ super(RebalanceMode.CUSTOMIZED);
+ setRebalancerRef(RebalancerRef.from(CustomRebalancer.class));
+ _preferenceMaps = Maps.newHashMap();
+ }
+
+ /**
+ * Get the preference maps of the partitions and replicas of the resource
+ * @return map of partition to participant and state
+ */
+ public Map<PartitionId, Map<ParticipantId, State>> getPreferenceMaps() {
+ return _preferenceMaps;
+ }
+
+ /**
+ * Set the preference maps of the partitions and replicas of the resource
+ * @param preferenceMaps map of partition to participant and state
+ */
+ public void setPreferenceMaps(Map<PartitionId, Map<ParticipantId, State>> preferenceMaps) {
+ _preferenceMaps = preferenceMaps;
+ }
+
+ /**
+ * Get the preference map of a partition
+ * @param partitionId the partition to look up
+ * @return map of participant to state
+ */
+ @JsonIgnore
+ public Map<ParticipantId, State> getPreferenceMap(PartitionId partitionId) {
+ return _preferenceMaps.get(partitionId);
+ }
+
+ /**
+ * Generate preference maps based on a default cluster setup
+ * @param stateModelDef the state model definition to follow
+ * @param participantSet the set of participant ids to configure for
+ */
+ @Override
+ @JsonIgnore
+ public void generateDefaultConfiguration(StateModelDefinition stateModelDef,
+ Set<ParticipantId> participantSet) {
+ // compute default upper bounds
+ Map<State, String> upperBounds = Maps.newHashMap();
+ for (State state : stateModelDef.getTypedStatesPriorityList()) {
+ upperBounds.put(state, stateModelDef.getNumParticipantsPerState(state));
+ }
+
+ // determine the current mapping
+ Map<PartitionId, Map<ParticipantId, State>> currentMapping = getPreferenceMaps();
+
+ // determine the preference maps
+ LinkedHashMap<State, Integer> stateCounts =
+ ConstraintBasedAssignment.stateCount(upperBounds, stateModelDef, participantSet.size(),
+ getReplicaCount());
+ ReplicaPlacementScheme placementScheme = new DefaultPlacementScheme();
+ List<ParticipantId> participantList = new ArrayList<ParticipantId>(participantSet);
+ List<PartitionId> partitionList = new ArrayList<PartitionId>(getPartitionSet());
+ AutoRebalanceStrategy strategy =
+ new AutoRebalanceStrategy(ResourceId.from(""), partitionList, stateCounts,
+ getMaxPartitionsPerParticipant(), placementScheme);
+ Map<String, Map<String, String>> rawPreferenceMaps =
+ strategy.typedComputePartitionAssignment(participantList, currentMapping, participantList)
+ .getMapFields();
+ Map<PartitionId, Map<ParticipantId, State>> preferenceMaps =
+ Maps.newHashMap(ResourceAssignment.replicaMapsFromStringMaps(rawPreferenceMaps));
+ setPreferenceMaps(preferenceMaps);
+ }
+
+ /**
+ * Build a CustomRebalancerContext. By default, it corresponds to {@link CustomRebalancer}
+ */
+ public static final class Builder extends PartitionedRebalancerContext.AbstractBuilder<Builder> {
+ private final Map<PartitionId, Map<ParticipantId, State>> _preferenceMaps;
+
+ /**
+ * Instantiate for a resource
+ * @param resourceId resource id
+ */
+ public Builder(ResourceId resourceId) {
+ super(resourceId);
+ super.rebalancerRef(RebalancerRef.from(CustomRebalancer.class));
+ _preferenceMaps = Maps.newHashMap();
+ }
+
+ /**
+ * Add a preference map for a partition
+ * @param partitionId partition to set
+ * @param preferenceList map of participant id to state indicating where replicas are served
+ * @return Builder
+ */
+ public Builder preferenceMap(PartitionId partitionId, Map<ParticipantId, State> preferenceMap) {
+ _preferenceMaps.put(partitionId, preferenceMap);
+ return self();
+ }
+
+ @Override
+ protected Builder self() {
+ return this;
+ }
+
+ @Override
+ public CustomRebalancerContext build() {
+ CustomRebalancerContext context = new CustomRebalancerContext();
+ super.update(context);
+ context.setPreferenceMaps(_preferenceMaps);
+ return context;
+ }
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/DefaultContextSerializer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/DefaultContextSerializer.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/DefaultContextSerializer.java
new file mode 100644
index 0000000..ecc93fb
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/DefaultContextSerializer.java
@@ -0,0 +1,83 @@
+package org.apache.helix.controller.rebalancer.context;
+
+import java.io.ByteArrayInputStream;
+import java.io.StringWriter;
+
+import org.apache.helix.HelixException;
+import org.apache.log4j.Logger;
+import org.codehaus.jackson.map.DeserializationConfig;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.codehaus.jackson.map.SerializationConfig;
+
+/*
+ * 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.
+ */
+
+/**
+ * Default serializer implementation for RebalancerContexts. Uses the Jackson JSON library to
+ * convert to and from strings
+ */
+public class DefaultContextSerializer implements ContextSerializer {
+
+ private static Logger logger = Logger.getLogger(DefaultContextSerializer.class);
+
+ @Override
+ public <T> String serialize(final T data) {
+ if (data == null) {
+ return null;
+ }
+
+ ObjectMapper mapper = new ObjectMapper();
+ SerializationConfig serializationConfig = mapper.getSerializationConfig();
+ serializationConfig.set(SerializationConfig.Feature.INDENT_OUTPUT, true);
+ serializationConfig.set(SerializationConfig.Feature.AUTO_DETECT_FIELDS, true);
+ serializationConfig.set(SerializationConfig.Feature.CAN_OVERRIDE_ACCESS_MODIFIERS, true);
+ StringWriter sw = new StringWriter();
+ try {
+ mapper.writeValue(sw, data);
+ } catch (Exception e) {
+ logger.error("Exception during payload data serialization.", e);
+ throw new HelixException(e);
+ }
+ return sw.toString();
+ }
+
+ @Override
+ public <T> T deserialize(final Class<T> clazz, final String string) {
+ if (string == null || string.length() == 0) {
+ return null;
+ }
+
+ ObjectMapper mapper = new ObjectMapper();
+ ByteArrayInputStream bais = new ByteArrayInputStream(string.getBytes());
+
+ DeserializationConfig deserializationConfig = mapper.getDeserializationConfig();
+ deserializationConfig.set(DeserializationConfig.Feature.AUTO_DETECT_FIELDS, true);
+ deserializationConfig.set(DeserializationConfig.Feature.AUTO_DETECT_SETTERS, true);
+ deserializationConfig.set(DeserializationConfig.Feature.AUTO_DETECT_CREATORS, true);
+ deserializationConfig.set(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, true);
+ deserializationConfig.set(DeserializationConfig.Feature.CAN_OVERRIDE_ACCESS_MODIFIERS, true);
+ try {
+ T payload = mapper.readValue(bais, clazz);
+ return payload;
+ } catch (Exception e) {
+ logger.error("Exception during deserialization of payload bytes: " + string, e);
+ return null;
+ }
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/e032132a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/FullAutoRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/FullAutoRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/FullAutoRebalancerContext.java
new file mode 100644
index 0000000..2db9ac6
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/controller/rebalancer/context/FullAutoRebalancerContext.java
@@ -0,0 +1,63 @@
+package org.apache.helix.controller.rebalancer.context;
+
+import org.apache.helix.api.id.ResourceId;
+import org.apache.helix.controller.rebalancer.FullAutoRebalancer;
+import org.apache.helix.controller.rebalancer.RebalancerRef;
+import org.apache.helix.model.IdealState.RebalanceMode;
+
+/*
+ * 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.
+ */
+
+/**
+ * RebalancerContext for FULL_AUTO rebalancing mode. By default, it corresponds to
+ * {@link FullAutoRebalancer}
+ */
+public class FullAutoRebalancerContext extends PartitionedRebalancerContext {
+ public FullAutoRebalancerContext() {
+ super(RebalanceMode.FULL_AUTO);
+ setRebalancerRef(RebalancerRef.from(FullAutoRebalancer.class));
+ }
+
+ /**
+ * Builder for a full auto rebalancer context. By default, it corresponds to
+ * {@link FullAutoRebalancer}
+ */
+ public static final class Builder extends PartitionedRebalancerContext.AbstractBuilder<Builder> {
+ /**
+ * Instantiate with a resource
+ * @param resourceId resource id
+ */
+ public Builder(ResourceId resourceId) {
+ super(resourceId);
+ super.rebalancerRef(RebalancerRef.from(FullAutoRebalancer.class));
+ }
+
+ @Override
+ protected Builder self() {
+ return this;
+ }
+
+ @Override
+ public FullAutoRebalancerContext build() {
+ FullAutoRebalancerContext context = new FullAutoRebalancerContext();
+ super.update(context);
+ return context;
+ }
+ }
+}