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Posted to commits@helix.apache.org by ka...@apache.org on 2013/10/16 01:51:46 UTC
[9/9] git commit: [HELIX-209] Shuffling around rebalancer code to
allow for compatibility
[HELIX-209] Shuffling around rebalancer code to allow for compatibility
Project: http://git-wip-us.apache.org/repos/asf/incubator-helix/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-helix/commit/9f229c80
Tree: http://git-wip-us.apache.org/repos/asf/incubator-helix/tree/9f229c80
Diff: http://git-wip-us.apache.org/repos/asf/incubator-helix/diff/9f229c80
Branch: refs/heads/helix-logical-model
Commit: 9f229c80ca0411c2a1efdf79300115a907751cd6
Parents: 6b57486
Author: Kanak Biscuitwala <ka...@apache.org>
Authored: Tue Oct 15 16:49:46 2013 -0700
Committer: Kanak Biscuitwala <ka...@apache.org>
Committed: Tue Oct 15 16:51:14 2013 -0700
----------------------------------------------------------------------
.../java/org/apache/helix/api/Resource.java | 4 +-
.../api/accessor/AtomicResourceAccessor.java | 2 +-
.../helix/api/accessor/ClusterAccessor.java | 4 +-
.../helix/api/accessor/ParticipantAccessor.java | 4 +-
.../helix/api/accessor/ResourceAccessor.java | 10 +-
.../apache/helix/api/config/ResourceConfig.java | 4 +-
.../api/rebalancer/BasicRebalancerContext.java | 239 ++++++++++++
.../helix/api/rebalancer/ContextSerializer.java | 37 ++
.../helix/api/rebalancer/CustomRebalancer.java | 123 ++++++
.../api/rebalancer/CustomRebalancerContext.java | 161 ++++++++
.../rebalancer/DefaultContextSerializer.java | 83 +++++
.../api/rebalancer/FullAutoRebalancer.java | 194 ++++++++++
.../rebalancer/FullAutoRebalancerContext.java | 61 +++
.../PartitionedRebalancerContext.java | 372 +++++++++++++++++++
.../apache/helix/api/rebalancer/Rebalancer.java | 38 ++
.../helix/api/rebalancer/RebalancerConfig.java | 177 +++++++++
.../helix/api/rebalancer/RebalancerContext.java | 93 +++++
.../helix/api/rebalancer/RebalancerRef.java | 94 +++++
.../rebalancer/ReplicatedRebalancerContext.java | 40 ++
.../api/rebalancer/SemiAutoRebalancer.java | 81 ++++
.../rebalancer/SemiAutoRebalancerContext.java | 176 +++++++++
.../util/ConstraintBasedAssignment.java | 244 ++++++++++++
.../controller/GenericHelixController.java | 40 +-
.../helix/controller/rebalancer/Rebalancer.java | 2 +
.../context/BasicRebalancerContext.java | 239 ------------
.../rebalancer/context/ContextSerializer.java | 37 --
.../rebalancer/context/CustomRebalancer.java | 123 ------
.../context/CustomRebalancerContext.java | 161 --------
.../context/DefaultContextSerializer.java | 83 -----
.../rebalancer/context/FullAutoRebalancer.java | 194 ----------
.../context/FullAutoRebalancerContext.java | 61 ---
.../context/PartitionedRebalancerContext.java | 372 -------------------
.../rebalancer/context/Rebalancer.java | 38 --
.../rebalancer/context/RebalancerConfig.java | 177 ---------
.../rebalancer/context/RebalancerContext.java | 93 -----
.../rebalancer/context/RebalancerRef.java | 94 -----
.../context/ReplicatedRebalancerContext.java | 40 --
.../rebalancer/context/SemiAutoRebalancer.java | 81 ----
.../context/SemiAutoRebalancerContext.java | 176 ---------
.../util/ConstraintBasedAssignment.java | 4 +-
.../util/NewConstraintBasedAssignment.java | 244 ------------
.../stages/BestPossibleStateCalcStage.java | 143 +++----
.../stages/BestPossibleStateOutput.java | 91 ++---
.../stages/CompatibilityCheckStage.java | 17 +-
.../stages/CurrentStateComputationStage.java | 91 ++---
.../stages/ExternalViewComputeStage.java | 154 ++++----
.../stages/MessageGenerationPhase.java | 215 -----------
.../stages/MessageGenerationStage.java | 213 +++++++++++
.../helix/controller/stages/MessageOutput.java | 79 ++++
.../stages/MessageSelectionStage.java | 129 ++++---
.../stages/MessageSelectionStageOutput.java | 60 ---
.../controller/stages/MessageThrottleStage.java | 41 +-
.../stages/MessageThrottleStageOutput.java | 53 ---
.../stages/NewBestPossibleStateCalcStage.java | 142 -------
.../stages/NewBestPossibleStateOutput.java | 49 ---
.../stages/NewCompatibilityCheckStage.java | 68 ----
.../stages/NewCurrentStateComputationStage.java | 142 -------
.../stages/NewExternalViewComputeStage.java | 281 --------------
.../stages/NewMessageGenerationStage.java | 213 -----------
.../controller/stages/NewMessageOutput.java | 79 ----
.../stages/NewMessageSelectionStage.java | 317 ----------------
.../stages/NewMessageThrottleStage.java | 198 ----------
.../stages/NewReadClusterDataStage.java | 73 ----
.../stages/NewResourceComputationStage.java | 138 -------
.../stages/NewTaskAssignmentStage.java | 151 --------
.../stages/PersistAssignmentStage.java | 2 +-
.../controller/stages/ReadClusterDataStage.java | 50 +--
.../controller/stages/ReadHealthDataStage.java | 2 -
.../stages/ResourceComputationStage.java | 164 ++++----
.../controller/stages/TaskAssignmentStage.java | 57 +--
.../java/org/apache/helix/model/IdealState.java | 2 +-
.../helix/tools/ClusterStateVerifier.java | 20 +-
.../org/apache/helix/tools/NewClusterSetup.java | 8 +-
.../org/apache/helix/api/TestNewStages.java | 10 +-
.../org/apache/helix/api/TestUpdateConfig.java | 4 +-
.../context/TestSerializeRebalancerContext.java | 3 +
.../helix/controller/stages/BaseStageTest.java | 4 +-
.../TestBestPossibleCalcStageCompatibility.java | 12 +-
.../stages/TestBestPossibleStateCalcStage.java | 6 +-
.../stages/TestCompatibilityCheckStage.java | 10 +-
.../TestCurrentStateComputationStage.java | 12 +-
.../stages/TestMessageThrottleStage.java | 20 +-
.../stages/TestMsgSelectionStage.java | 6 +-
.../stages/TestRebalancePipeline.java | 54 +--
.../stages/TestResourceComputationStage.java | 16 +-
.../strategy/TestAutoRebalanceStrategy.java | 6 +-
.../strategy/TestNewAutoRebalanceStrategy.java | 6 +-
.../TestCustomizedIdealStateRebalancer.java | 6 +-
.../apache/helix/examples/NewModelExample.java | 2 +-
89 files changed, 3139 insertions(+), 4980 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/Resource.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/Resource.java b/helix-core/src/main/java/org/apache/helix/api/Resource.java
index 79a1e09..a505aeb 100644
--- a/helix-core/src/main/java/org/apache/helix/api/Resource.java
+++ b/helix-core/src/main/java/org/apache/helix/api/Resource.java
@@ -30,8 +30,8 @@ import org.apache.helix.api.config.UserConfig;
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.controller.rebalancer.context.RebalancerConfig;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerConfig;
+import org.apache.helix.api.rebalancer.RebalancerContext;
import org.apache.helix.model.ExternalView;
import org.apache.helix.model.IdealState;
import org.apache.helix.model.Message;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/accessor/AtomicResourceAccessor.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/accessor/AtomicResourceAccessor.java b/helix-core/src/main/java/org/apache/helix/api/accessor/AtomicResourceAccessor.java
index 6d69981..74b6bdb 100644
--- a/helix-core/src/main/java/org/apache/helix/api/accessor/AtomicResourceAccessor.java
+++ b/helix-core/src/main/java/org/apache/helix/api/accessor/AtomicResourceAccessor.java
@@ -6,7 +6,7 @@ import org.apache.helix.api.Scope;
import org.apache.helix.api.config.ResourceConfig;
import org.apache.helix.api.id.ClusterId;
import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerContext;
import org.apache.helix.lock.HelixLock;
import org.apache.helix.lock.HelixLockable;
import org.apache.log4j.Logger;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/accessor/ClusterAccessor.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/accessor/ClusterAccessor.java b/helix-core/src/main/java/org/apache/helix/api/accessor/ClusterAccessor.java
index 85b8432..ed6c844 100644
--- a/helix-core/src/main/java/org/apache/helix/api/accessor/ClusterAccessor.java
+++ b/helix-core/src/main/java/org/apache/helix/api/accessor/ClusterAccessor.java
@@ -51,8 +51,8 @@ import org.apache.helix.api.id.PartitionId;
import org.apache.helix.api.id.ResourceId;
import org.apache.helix.api.id.SessionId;
import org.apache.helix.api.id.StateModelDefId;
-import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerConfig;
+import org.apache.helix.api.rebalancer.RebalancerContext;
import org.apache.helix.model.Alerts;
import org.apache.helix.model.ClusterConfiguration;
import org.apache.helix.model.ClusterConstraints;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/accessor/ParticipantAccessor.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/accessor/ParticipantAccessor.java b/helix-core/src/main/java/org/apache/helix/api/accessor/ParticipantAccessor.java
index 83dd53e..ff24ee9 100644
--- a/helix-core/src/main/java/org/apache/helix/api/accessor/ParticipantAccessor.java
+++ b/helix-core/src/main/java/org/apache/helix/api/accessor/ParticipantAccessor.java
@@ -51,8 +51,8 @@ import org.apache.helix.api.id.PartitionId;
import org.apache.helix.api.id.ResourceId;
import org.apache.helix.api.id.SessionId;
import org.apache.helix.api.id.StateModelDefId;
-import org.apache.helix.controller.rebalancer.context.PartitionedRebalancerContext;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
+import org.apache.helix.api.rebalancer.PartitionedRebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerContext;
import org.apache.helix.model.CurrentState;
import org.apache.helix.model.ExternalView;
import org.apache.helix.model.IdealState;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/accessor/ResourceAccessor.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/accessor/ResourceAccessor.java b/helix-core/src/main/java/org/apache/helix/api/accessor/ResourceAccessor.java
index 517c8c4..b959f17 100644
--- a/helix-core/src/main/java/org/apache/helix/api/accessor/ResourceAccessor.java
+++ b/helix-core/src/main/java/org/apache/helix/api/accessor/ResourceAccessor.java
@@ -38,11 +38,11 @@ import org.apache.helix.api.config.UserConfig;
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.context.CustomRebalancerContext;
-import org.apache.helix.controller.rebalancer.context.PartitionedRebalancerContext;
-import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
-import org.apache.helix.controller.rebalancer.context.SemiAutoRebalancerContext;
+import org.apache.helix.api.rebalancer.CustomRebalancerContext;
+import org.apache.helix.api.rebalancer.PartitionedRebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerConfig;
+import org.apache.helix.api.rebalancer.RebalancerContext;
+import org.apache.helix.api.rebalancer.SemiAutoRebalancerContext;
import org.apache.helix.model.ExternalView;
import org.apache.helix.model.IdealState;
import org.apache.helix.model.IdealState.RebalanceMode;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/config/ResourceConfig.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/config/ResourceConfig.java b/helix-core/src/main/java/org/apache/helix/api/config/ResourceConfig.java
index 38d48ab..ec1d8f6 100644
--- a/helix-core/src/main/java/org/apache/helix/api/config/ResourceConfig.java
+++ b/helix-core/src/main/java/org/apache/helix/api/config/ResourceConfig.java
@@ -7,8 +7,8 @@ import org.apache.helix.api.Partition;
import org.apache.helix.api.Scope;
import org.apache.helix.api.id.PartitionId;
import org.apache.helix.api.id.ResourceId;
-import org.apache.helix.controller.rebalancer.context.RebalancerConfig;
-import org.apache.helix.controller.rebalancer.context.RebalancerContext;
+import org.apache.helix.api.rebalancer.RebalancerConfig;
+import org.apache.helix.api.rebalancer.RebalancerContext;
import com.google.common.collect.Sets;
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/BasicRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/BasicRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/BasicRebalancerContext.java
new file mode 100644
index 0000000..b346cda
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/BasicRebalancerContext.java
@@ -0,0 +1,239 @@
+package org.apache.helix.api.rebalancer;
+
+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.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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/ContextSerializer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/ContextSerializer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/ContextSerializer.java
new file mode 100644
index 0000000..10e3ba9
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/ContextSerializer.java
@@ -0,0 +1,37 @@
+package org.apache.helix.api.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.
+ */
+
+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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancer.java
new file mode 100644
index 0000000..c5e4e80
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancer.java
@@ -0,0 +1,123 @@
+package org.apache.helix.api.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.api.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
+ * 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 CustomRebalancer implements Rebalancer {
+
+ private static final Logger LOG = Logger.getLogger(CustomRebalancer.class);
+
+ @Override
+ public void init(HelixManager helixManager) {
+ // do nothing
+ }
+
+ @Override
+ 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:" + config.getResourceId());
+ }
+ 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 rebalancer mode
+ * @param liveParticipantMap
+ * @param stateModelDef
+ * @param preferenceMap
+ * @param currentStateMap
+ * @param disabledParticipantsForPartition
+ * @return
+ */
+ 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 resource is deleted, idealStateMap will be null/empty and
+ // we should drop all resources.
+ if (currentStateMap != null) {
+ for (ParticipantId participantId : currentStateMap.keySet()) {
+ if ((preferenceMap == null || !preferenceMap.containsKey(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());
+ }
+ }
+ }
+
+ // ideal state is deleted
+ if (preferenceMap == null) {
+ return participantStateMap;
+ }
+
+ for (ParticipantId participantId : preferenceMap.keySet()) {
+ boolean notInErrorState =
+ currentStateMap == null || currentStateMap.get(participantId) == null
+ || !currentStateMap.get(participantId).equals(State.from(HelixDefinedState.ERROR));
+
+ if (liveParticipantSet.contains(participantId) && notInErrorState
+ && !disabledParticipantsForPartition.contains(participantId)) {
+ participantStateMap.put(participantId, preferenceMap.get(participantId));
+ }
+ }
+
+ return participantStateMap;
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancerContext.java
new file mode 100644
index 0000000..9d5b7e8
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/CustomRebalancerContext.java
@@ -0,0 +1,161 @@
+package org.apache.helix.api.rebalancer;
+
+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.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.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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/DefaultContextSerializer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/DefaultContextSerializer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/DefaultContextSerializer.java
new file mode 100644
index 0000000..64e1f8b
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/DefaultContextSerializer.java
@@ -0,0 +1,83 @@
+package org.apache.helix.api.rebalancer;
+
+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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancer.java
new file mode 100644
index 0000000..f5a5abe
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancer.java
@@ -0,0 +1,194 @@
+package org.apache.helix.api.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.api.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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancerContext.java
new file mode 100644
index 0000000..6a3fe10
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/FullAutoRebalancerContext.java
@@ -0,0 +1,61 @@
+package org.apache.helix.api.rebalancer;
+
+import org.apache.helix.api.id.ResourceId;
+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;
+ }
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/PartitionedRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/PartitionedRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/PartitionedRebalancerContext.java
new file mode 100644
index 0000000..311683d
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/PartitionedRebalancerContext.java
@@ -0,0 +1,372 @@
+package org.apache.helix.api.rebalancer;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.helix.HelixConstants.StateModelToken;
+import org.apache.helix.api.Partition;
+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.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.JsonIgnoreProperties;
+
+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 whose subunits are partitions. In addition, these partitions can
+ * be replicated.
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class PartitionedRebalancerContext extends BasicRebalancerContext implements
+ ReplicatedRebalancerContext {
+ private Map<PartitionId, Partition> _partitionMap;
+ private boolean _anyLiveParticipant;
+ private int _replicaCount;
+ private int _maxPartitionsPerParticipant;
+ private final RebalanceMode _rebalanceMode;
+
+ /**
+ * Instantiate a DataRebalancerContext
+ */
+ public PartitionedRebalancerContext(RebalanceMode rebalanceMode) {
+ _partitionMap = Collections.emptyMap();
+ _replicaCount = 1;
+ _anyLiveParticipant = false;
+ _maxPartitionsPerParticipant = Integer.MAX_VALUE;
+ _rebalanceMode = rebalanceMode;
+ }
+
+ /**
+ * Get a map from partition id to partition
+ * @return partition map (mutable)
+ */
+ public Map<PartitionId, Partition> getPartitionMap() {
+ return _partitionMap;
+ }
+
+ /**
+ * Set a map of partition id to partition
+ * @param partitionMap partition map
+ */
+ public void setPartitionMap(Map<PartitionId, Partition> partitionMap) {
+ _partitionMap = Maps.newHashMap(partitionMap);
+ }
+
+ /**
+ * Get the set of partitions for this resource
+ * @return set of partition ids
+ */
+ @JsonIgnore
+ public Set<PartitionId> getPartitionSet() {
+ return _partitionMap.keySet();
+ }
+
+ /**
+ * Get a partition
+ * @param partitionId id of the partition to get
+ * @return Partition object, or null if not present
+ */
+ @JsonIgnore
+ public Partition getPartition(PartitionId partitionId) {
+ return _partitionMap.get(partitionId);
+ }
+
+ @Override
+ public boolean anyLiveParticipant() {
+ return _anyLiveParticipant;
+ }
+
+ /**
+ * Indicate if this resource should be assigned to any live participant
+ * @param anyLiveParticipant true if any live participant expected, false otherwise
+ */
+ public void setAnyLiveParticipant(boolean anyLiveParticipant) {
+ _anyLiveParticipant = anyLiveParticipant;
+ }
+
+ @Override
+ public int getReplicaCount() {
+ return _replicaCount;
+ }
+
+ /**
+ * Set the number of replicas that each partition should have
+ * @param replicaCount
+ */
+ public void setReplicaCount(int replicaCount) {
+ _replicaCount = replicaCount;
+ }
+
+ /**
+ * Get the maximum number of partitions that a participant can serve
+ * @return maximum number of partitions per participant
+ */
+ public int getMaxPartitionsPerParticipant() {
+ return _maxPartitionsPerParticipant;
+ }
+
+ /**
+ * Set the maximum number of partitions that a participant can serve
+ * @param maxPartitionsPerParticipant maximum number of partitions per participant
+ */
+ public void setMaxPartitionsPerParticipant(int maxPartitionsPerParticipant) {
+ _maxPartitionsPerParticipant = maxPartitionsPerParticipant;
+ }
+
+ /**
+ * Get the rebalancer mode of the resource
+ * @return RebalanceMode
+ */
+ public RebalanceMode getRebalanceMode() {
+ return _rebalanceMode;
+ }
+
+ @Override
+ @JsonIgnore
+ public Map<PartitionId, Partition> getSubUnitMap() {
+ return getPartitionMap();
+ }
+
+ /**
+ * Generate a default configuration given the state model and a participant.
+ * @param stateModelDef the state model definition to follow
+ * @param participantSet the set of participant ids to configure for
+ */
+ @JsonIgnore
+ public void generateDefaultConfiguration(StateModelDefinition stateModelDef,
+ Set<ParticipantId> participantSet) {
+ // the base context does not understand enough to know do to anything
+ }
+
+ /**
+ * Convert a physically-stored IdealState into a rebalancer context for a partitioned resource
+ * @param idealState populated IdealState
+ * @return PartitionedRebalancerContext
+ */
+ public static PartitionedRebalancerContext from(IdealState idealState) {
+ PartitionedRebalancerContext context;
+ switch (idealState.getRebalanceMode()) {
+ case FULL_AUTO:
+ FullAutoRebalancerContext.Builder fullAutoBuilder =
+ new FullAutoRebalancerContext.Builder(idealState.getResourceId());
+ populateContext(fullAutoBuilder, idealState);
+ context = fullAutoBuilder.build();
+ break;
+ case SEMI_AUTO:
+ SemiAutoRebalancerContext.Builder semiAutoBuilder =
+ new SemiAutoRebalancerContext.Builder(idealState.getResourceId());
+ for (PartitionId partitionId : idealState.getPartitionIdSet()) {
+ semiAutoBuilder.preferenceList(partitionId, idealState.getPreferenceList(partitionId));
+ }
+ populateContext(semiAutoBuilder, idealState);
+ context = semiAutoBuilder.build();
+ break;
+ case CUSTOMIZED:
+ CustomRebalancerContext.Builder customBuilder =
+ new CustomRebalancerContext.Builder(idealState.getResourceId());
+ for (PartitionId partitionId : idealState.getPartitionIdSet()) {
+ customBuilder.preferenceMap(partitionId, idealState.getParticipantStateMap(partitionId));
+ }
+ populateContext(customBuilder, idealState);
+ context = customBuilder.build();
+ break;
+ default:
+ Builder baseBuilder = new Builder(idealState.getResourceId());
+ populateContext(baseBuilder, idealState);
+ context = baseBuilder.build();
+ break;
+ }
+ return context;
+ }
+
+ /**
+ * Update a builder subclass with all the fields of the ideal state
+ * @param builder builder that extends AbstractBuilder
+ * @param idealState populated IdealState
+ */
+ private static <T extends AbstractBuilder<T>> void populateContext(T builder,
+ IdealState idealState) {
+ String replicas = idealState.getReplicas();
+ int replicaCount = 0;
+ boolean anyLiveParticipant = false;
+ if (replicas.equals(StateModelToken.ANY_LIVEINSTANCE.toString())) {
+ anyLiveParticipant = true;
+ } else {
+ replicaCount = Integer.parseInt(replicas);
+ }
+ if (idealState.getNumPartitions() > 0 && idealState.getPartitionIdSet().size() == 0) {
+ // backwards compatibility: partition sets were based on pref lists/maps previously
+ builder.addPartitions(idealState.getNumPartitions());
+ } else {
+ for (PartitionId partitionId : idealState.getPartitionIdSet()) {
+ builder.addPartition(new Partition(partitionId));
+ }
+ }
+ builder.anyLiveParticipant(anyLiveParticipant).replicaCount(replicaCount)
+ .maxPartitionsPerParticipant(idealState.getMaxPartitionsPerInstance())
+ .participantGroupTag(idealState.getInstanceGroupTag())
+ .stateModelDefId(idealState.getStateModelDefId())
+ .stateModelFactoryId(idealState.getStateModelFactoryId());
+ RebalancerRef rebalancerRef = idealState.getRebalancerRef();
+ if (rebalancerRef != null) {
+ builder.rebalancerRef(rebalancerRef);
+ }
+ }
+
+ /**
+ * Builder for a basic data rebalancer context
+ */
+ public static final class Builder extends AbstractBuilder<Builder> {
+ /**
+ * Instantiate with a resource
+ * @param resourceId resource id
+ */
+ public Builder(ResourceId resourceId) {
+ super(resourceId);
+ }
+
+ @Override
+ protected Builder self() {
+ return this;
+ }
+
+ @Override
+ public PartitionedRebalancerContext build() {
+ PartitionedRebalancerContext context =
+ new PartitionedRebalancerContext(RebalanceMode.USER_DEFINED);
+ super.update(context);
+ return context;
+ }
+ }
+
+ /**
+ * Abstract builder for a generic partitioned resource rebalancer context
+ */
+ public static abstract class AbstractBuilder<T extends BasicRebalancerContext.AbstractBuilder<T>>
+ extends BasicRebalancerContext.AbstractBuilder<T> {
+ private final ResourceId _resourceId;
+ private final Map<PartitionId, Partition> _partitionMap;
+ private boolean _anyLiveParticipant;
+ private int _replicaCount;
+ private int _maxPartitionsPerParticipant;
+
+ /**
+ * Instantiate with a resource
+ * @param resourceId resource id
+ */
+ public AbstractBuilder(ResourceId resourceId) {
+ super(resourceId);
+ _resourceId = resourceId;
+ _partitionMap = Maps.newHashMap();
+ _anyLiveParticipant = false;
+ _replicaCount = 1;
+ _maxPartitionsPerParticipant = Integer.MAX_VALUE;
+ }
+
+ /**
+ * Add a partition that the resource serves
+ * @param partition fully-qualified partition
+ * @return Builder
+ */
+ public T addPartition(Partition partition) {
+ _partitionMap.put(partition.getId(), partition);
+ return self();
+ }
+
+ /**
+ * Add a collection of partitions
+ * @param partitions any collection of Partition objects
+ * @return Builder
+ */
+ public T addPartitions(Collection<Partition> partitions) {
+ for (Partition partition : partitions) {
+ addPartition(partition);
+ }
+ return self();
+ }
+
+ /**
+ * Add a specified number of partitions with a default naming scheme, namely
+ * resourceId_partitionNumber where partitionNumber starts at 0
+ * @param partitionCount number of partitions to add
+ * @return Builder
+ */
+ public T addPartitions(int partitionCount) {
+ for (int i = 0; i < partitionCount; i++) {
+ addPartition(new Partition(PartitionId.from(_resourceId, Integer.toString(i))));
+ }
+ return self();
+ }
+
+ /**
+ * Set whether any live participant should be used in rebalancing
+ * @param anyLiveParticipant true if any live participant can be used, false otherwise
+ * @return Builder
+ */
+ public T anyLiveParticipant(boolean anyLiveParticipant) {
+ _anyLiveParticipant = anyLiveParticipant;
+ return self();
+ }
+
+ /**
+ * Set the number of replicas
+ * @param replicaCount number of replicas
+ * @return Builder
+ */
+ public T replicaCount(int replicaCount) {
+ _replicaCount = replicaCount;
+ return self();
+ }
+
+ /**
+ * Set the maximum number of partitions to assign to any participant
+ * @param maxPartitionsPerParticipant the maximum
+ * @return Builder
+ */
+ public T maxPartitionsPerParticipant(int maxPartitionsPerParticipant) {
+ _maxPartitionsPerParticipant = maxPartitionsPerParticipant;
+ return self();
+ }
+
+ /**
+ * Update a DataRebalancerContext with fields from this builder level
+ * @param context DataRebalancerContext
+ */
+ protected final void update(PartitionedRebalancerContext context) {
+ super.update(context);
+ // enforce at least one partition
+ if (_partitionMap.isEmpty()) {
+ addPartitions(1);
+ }
+ context.setPartitionMap(_partitionMap);
+ context.setAnyLiveParticipant(_anyLiveParticipant);
+ context.setMaxPartitionsPerParticipant(_maxPartitionsPerParticipant);
+ context.setReplicaCount(_replicaCount);
+ }
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/Rebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/Rebalancer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/Rebalancer.java
new file mode 100644
index 0000000..e164920
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/Rebalancer.java
@@ -0,0 +1,38 @@
+package org.apache.helix.api.rebalancer;
+
+import org.apache.helix.HelixManager;
+import org.apache.helix.api.Cluster;
+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
+ * 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.
+ */
+
+/**
+ * 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 resource assignment for a resource in this method.<br/>
+ */
+public interface Rebalancer {
+
+ 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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerConfig.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerConfig.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerConfig.java
new file mode 100644
index 0000000..2c57a29
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerConfig.java
@@ -0,0 +1,177 @@
+package org.apache.helix.api.rebalancer;
+
+import org.apache.helix.api.Scope;
+import org.apache.helix.api.config.NamespacedConfig;
+import org.apache.helix.model.ResourceConfiguration;
+import org.apache.helix.util.HelixUtil;
+import org.apache.log4j.Logger;
+
+/*
+ * 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.
+ */
+
+/**
+ * Configuration for a resource rebalancer. This contains a RebalancerContext, which contains
+ * information specific to each rebalancer.
+ */
+public final class RebalancerConfig {
+ private enum Fields {
+ SERIALIZER_CLASS,
+ REBALANCER_CONTEXT,
+ REBALANCER_CONTEXT_CLASS
+ }
+
+ private static final Logger LOG = Logger.getLogger(RebalancerConfig.class);
+ private ContextSerializer _serializer;
+ private Rebalancer _rebalancer;
+ private final RebalancerContext _context;
+ private final NamespacedConfig _config;
+
+ /**
+ * Instantiate a RebalancerConfig
+ * @param context rebalancer context
+ * @param rebalancerRef reference to the rebalancer class that will be used
+ */
+ public RebalancerConfig(RebalancerContext context) {
+ _config =
+ new NamespacedConfig(Scope.resource(context.getResourceId()),
+ RebalancerConfig.class.getSimpleName());
+ _config.setSimpleField(Fields.SERIALIZER_CLASS.toString(), context.getSerializerClass()
+ .getName());
+ _config
+ .setSimpleField(Fields.REBALANCER_CONTEXT_CLASS.toString(), context.getClass().getName());
+ _context = context;
+ try {
+ _serializer = context.getSerializerClass().newInstance();
+ _config.setSimpleField(Fields.REBALANCER_CONTEXT.toString(), _serializer.serialize(context));
+ } catch (InstantiationException e) {
+ LOG.error("Error initializing the configuration", e);
+ } catch (IllegalAccessException e) {
+ LOG.error("Error initializing the configuration", e);
+ }
+ }
+
+ /**
+ * Instantiate from a physical ResourceConfiguration
+ * @param resourceConfiguration populated ResourceConfiguration
+ */
+ public RebalancerConfig(ResourceConfiguration resourceConfiguration) {
+ _config = new NamespacedConfig(resourceConfiguration, RebalancerConfig.class.getSimpleName());
+ _serializer = getSerializer();
+ _context = getContext();
+ }
+
+ /**
+ * Get the class that can serialize and deserialize the rebalancer context
+ * @return ContextSerializer
+ */
+ private ContextSerializer getSerializer() {
+ String serializerClassName = _config.getSimpleField(Fields.SERIALIZER_CLASS.toString());
+ if (serializerClassName != null) {
+ try {
+ return (ContextSerializer) HelixUtil.loadClass(getClass(), serializerClassName)
+ .newInstance();
+ } catch (InstantiationException e) {
+ LOG.error("Error getting the serializer", e);
+ } catch (IllegalAccessException e) {
+ LOG.error("Error getting the serializer", e);
+ } catch (ClassNotFoundException e) {
+ LOG.error("Error getting the serializer", e);
+ }
+ }
+ return null;
+ }
+
+ private RebalancerContext getContext() {
+ String className = _config.getSimpleField(Fields.REBALANCER_CONTEXT_CLASS.toString());
+ try {
+ Class<? extends RebalancerContext> contextClass =
+ HelixUtil.loadClass(getClass(), className).asSubclass(RebalancerContext.class);
+ String serialized = _config.getSimpleField(Fields.REBALANCER_CONTEXT.toString());
+ return _serializer.deserialize(contextClass, serialized);
+ } catch (ClassNotFoundException e) {
+ LOG.error(className + " is not a valid class");
+ } catch (ClassCastException e) {
+ LOG.error(className + " does not implement RebalancerContext");
+ }
+ return null;
+ }
+
+ /**
+ * Get a rebalancer class instance
+ * @return Rebalancer
+ */
+ public Rebalancer getRebalancer() {
+ // cache the rebalancer to avoid loading and instantiating it excessively
+ if (_rebalancer == null) {
+ if (_context == null || _context.getRebalancerRef() == null) {
+ return null;
+ }
+ _rebalancer = _context.getRebalancerRef().getRebalancer();
+ }
+ return _rebalancer;
+ }
+
+ /**
+ * Get the instantiated RebalancerContext
+ * @param contextClass specific class of the RebalancerContext
+ * @return RebalancerContext subclass instance, or null if conversion is not possible
+ */
+ public <T extends RebalancerContext> T getRebalancerContext(Class<T> contextClass) {
+ try {
+ return contextClass.cast(_context);
+ } catch (ClassCastException e) {
+ LOG.info(contextClass + " is incompatible with context class: " + _context.getClass());
+ }
+ return null;
+ }
+
+ /**
+ * Get the rebalancer context serialized as a string
+ * @return string representing the context
+ */
+ public String getSerializedContext() {
+ return _config.getSimpleField(Fields.REBALANCER_CONTEXT.toString());
+ }
+
+ /**
+ * Convert this to a namespaced config
+ * @return NamespacedConfig
+ */
+ public NamespacedConfig toNamespacedConfig() {
+ return _config;
+ }
+
+ /**
+ * Get a RebalancerConfig from a physical resource config
+ * @param resourceConfiguration physical resource config
+ * @return RebalancerConfig
+ */
+ public static RebalancerConfig from(ResourceConfiguration resourceConfiguration) {
+ return new RebalancerConfig(resourceConfiguration);
+ }
+
+ /**
+ * Get a RebalancerConfig from a RebalancerContext
+ * @param context instantiated RebalancerContext
+ * @return RebalancerConfig
+ */
+ public static RebalancerConfig from(RebalancerContext context) {
+ return new RebalancerConfig(context);
+ }
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerContext.java
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diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerContext.java
new file mode 100644
index 0000000..80f6b06
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerContext.java
@@ -0,0 +1,93 @@
+package org.apache.helix.api.rebalancer;
+
+import java.util.Map;
+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;
+
+/*
+ * 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.
+ */
+
+/**
+ * Defines the state available to a rebalancer. The most common use case is to use a
+ * {@link PartitionedRebalancerContext} or a subclass and set up a resource with it. A rebalancer
+ * configuration, at a minimum, is aware of subunits of a resource, the state model to follow, and
+ * how the configuration should be serialized.
+ */
+public interface RebalancerContext {
+ /**
+ * Get a map of resource partition identifiers to partitions. A partition is a subunit of a
+ * resource, e.g. a subtask of a task
+ * @return map of (subunit id, subunit) pairs
+ */
+ public Map<? extends PartitionId, ? extends Partition> getSubUnitMap();
+
+ /**
+ * Get the subunits of the resource (e.g. partitions)
+ * @return set of subunit ids
+ */
+ public Set<? extends PartitionId> getSubUnitIdSet();
+
+ /**
+ * Get a specific subunit
+ * @param subUnitId the id of the subunit
+ * @return SubUnit
+ */
+ public Partition getSubUnit(PartitionId subUnitId);
+
+ /**
+ * Get the resource to rebalance
+ * @return resource id
+ */
+ public ResourceId getResourceId();
+
+ /**
+ * Get the state model definition that the resource follows
+ * @return state model definition id
+ */
+ public StateModelDefId getStateModelDefId();
+
+ /**
+ * Get the state model factory of this resource
+ * @return state model factory id
+ */
+ public StateModelFactoryId getStateModelFactoryId();
+
+ /**
+ * Get the tag, if any, that participants must have in order to serve this resource
+ * @return participant group tag, or null
+ */
+ public String getParticipantGroupTag();
+
+ /**
+ * Get the serializer for this context
+ * @return ContextSerializer class object
+ */
+ public Class<? extends ContextSerializer> getSerializerClass();
+
+ /**
+ * Get a reference to the class used to rebalance this resource
+ * @return RebalancerRef
+ */
+ public RebalancerRef getRebalancerRef();
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerRef.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerRef.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerRef.java
new file mode 100644
index 0000000..83ae589
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/RebalancerRef.java
@@ -0,0 +1,94 @@
+package org.apache.helix.api.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/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/ReplicatedRebalancerContext.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/ReplicatedRebalancerContext.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/ReplicatedRebalancerContext.java
new file mode 100644
index 0000000..4e98ce7
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/ReplicatedRebalancerContext.java
@@ -0,0 +1,40 @@
+package org.apache.helix.api.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.
+ */
+
+/**
+ * Methods specifying a rebalancer context that allows replicas. For instance, a rebalancer context
+ * with partitions may accept state model definitions that support multiple replicas per partition,
+ * and it's possible that the policy is that each live participant in the system should have a
+ * replica.
+ */
+public interface ReplicatedRebalancerContext extends RebalancerContext {
+ /**
+ * Check if this resource should be assigned to any live participant
+ * @return true if any live participant expected, false otherwise
+ */
+ public boolean anyLiveParticipant();
+
+ /**
+ * Get the number of replicas that each resource subunit should have
+ * @return replica count
+ */
+ public int getReplicaCount();
+}
http://git-wip-us.apache.org/repos/asf/incubator-helix/blob/9f229c80/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancer.java
----------------------------------------------------------------------
diff --git a/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancer.java b/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancer.java
new file mode 100644
index 0000000..80ab256
--- /dev/null
+++ b/helix-core/src/main/java/org/apache/helix/api/rebalancer/SemiAutoRebalancer.java
@@ -0,0 +1,81 @@
+package org.apache.helix.api.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.api.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
+ * 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.
+ */
+
+/**
+ * Rebalancer for the SEMI_AUTO mode. It expects a RebalancerConfig that understands the preferred
+ * locations of each partition replica
+ */
+public class SemiAutoRebalancer implements Rebalancer {
+ private static final Logger LOG = Logger.getLogger(SemiAutoRebalancer.class);
+
+ @Override
+ public void init(HelixManager helixManager) {
+ // do nothing
+ }
+
+ @Override
+ 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:" + config.getResourceId());
+ }
+ 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;
+ }
+
+}