| package org.apache.helix.webapp.resources; |
| |
| /* |
| * 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.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.helix.HelixDataAccessor; |
| import org.apache.helix.HelixException; |
| import org.apache.helix.PropertyKey; |
| import org.apache.helix.PropertyKey.Builder; |
| import org.apache.helix.zookeeper.datamodel.ZNRecord; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.IdealState; |
| import org.apache.helix.tools.ClusterSetup; |
| import org.codehaus.jackson.JsonGenerationException; |
| import org.codehaus.jackson.map.JsonMappingException; |
| import org.restlet.data.MediaType; |
| import org.restlet.data.Status; |
| import org.restlet.representation.Representation; |
| import org.restlet.representation.StringRepresentation; |
| import org.restlet.representation.Variant; |
| import org.restlet.resource.ServerResource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Class for server-side resource at |
| * <code>"/clusters/{clusterName}/resourceGroups/{resourceName}/idealState" |
| * <p> |
| * <li>GET get ideal state |
| * <li>POST set ideal state |
| */ |
| public class IdealStateResource extends ServerResource { |
| private final static Logger LOG = LoggerFactory.getLogger(IdealStateResource.class); |
| |
| public IdealStateResource() { |
| getVariants().add(new Variant(MediaType.TEXT_PLAIN)); |
| getVariants().add(new Variant(MediaType.APPLICATION_JSON)); |
| setNegotiated(false); |
| } |
| |
| /** |
| * Get ideal state |
| * <p> |
| * Usage: |
| * <code>curl http://{host:port}/clusters/{clusterName}/resourceGroups/{resourceName}/idealState |
| */ |
| @Override |
| public Representation get() { |
| StringRepresentation presentation = null; |
| try { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| String resourceName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.RESOURCE_NAME); |
| presentation = getIdealStateRepresentation(clusterName, resourceName); |
| } |
| |
| catch (Exception e) { |
| String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e); |
| presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON); |
| |
| LOG.error("Exception in get idealState", e); |
| } |
| return presentation; |
| } |
| |
| StringRepresentation getIdealStateRepresentation(String clusterName, String resourceName) |
| throws JsonGenerationException, JsonMappingException, IOException { |
| Builder keyBuilder = new PropertyKey.Builder(clusterName); |
| ZkClient zkclient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.RAW_ZKCLIENT); |
| String idealStateStr = |
| ResourceUtil.readZkAsBytes(zkclient, keyBuilder.idealStates(resourceName)); |
| |
| StringRepresentation representation = |
| new StringRepresentation(idealStateStr, MediaType.APPLICATION_JSON); |
| |
| return representation; |
| } |
| |
| /** |
| * Set ideal state |
| * <p> |
| * Usage: |
| * <p> |
| * <li>Add ideal state: |
| * <code>curl -d @'{newIdealState.json}' -H 'Content-Type: application/json' |
| * http://{host:port}/clusters/{cluster}/resourceGroups/{resource}/idealState |
| * <pre> |
| * newIdealState: |
| * jsonParameters={"command":"addIdealState"}&newIdealState={ |
| * "id" : "{MyDB}", |
| * "simpleFields" : { |
| * "IDEAL_STATE_MODE" : "AUTO", |
| * "NUM_PARTITIONS" : "{8}", |
| * "REBALANCE_MODE" : "SEMI_AUTO", |
| * "REPLICAS" : "0", |
| * "STATE_MODEL_DEF_REF" : "MasterSlave", |
| * "STATE_MODEL_FACTORY_NAME" : "DEFAULT" |
| * }, |
| * "listFields" : { |
| * }, |
| * "mapFields" : { |
| * "{MyDB_0}" : { |
| * "{localhost_1001}" : "MASTER", |
| * "{localhost_1002}" : "SLAVE" |
| * } |
| * } |
| * } |
| * </pre> |
| * <li>Rebalance cluster: |
| * <code>curl -d 'jsonParameters={"command":"rebalance","replicas":"{3}"}' |
| * -H "Content-Type: application/json" http://{host:port}/clusters/{cluster}/resourceGroups/{resource}/idealState |
| * <li>Expand resource: <code>n/a |
| * <li>Add resource property: |
| * <code>curl -d 'jsonParameters={"command":"addResourceProperty","{REBALANCE_TIMER_PERIOD}":"{500}"}' |
| * -H "Content-Type: application/json" http://{host:port}/clusters/{cluster}/resourceGroups/{resource}/idealState |
| */ |
| @Override |
| public Representation post(Representation entity) { |
| try { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| String resourceName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.RESOURCE_NAME); |
| |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| |
| JsonParameters jsonParameters = new JsonParameters(entity); |
| String command = jsonParameters.getCommand(); |
| |
| if (command.equalsIgnoreCase(ClusterSetup.addIdealState)) { |
| ZNRecord newIdealState = jsonParameters.getExtraParameter(JsonParameters.NEW_IDEAL_STATE); |
| HelixDataAccessor accessor = |
| ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName); |
| |
| accessor.setProperty(accessor.keyBuilder().idealStates(resourceName), new IdealState( |
| newIdealState)); |
| |
| } else if (command.equalsIgnoreCase(ClusterSetup.rebalance)) { |
| int replicas = Integer.parseInt(jsonParameters.getParameter(JsonParameters.REPLICAS)); |
| String keyPrefix = jsonParameters.getParameter(JsonParameters.RESOURCE_KEY_PREFIX); |
| String groupTag = jsonParameters.getParameter(ClusterSetup.instanceGroupTag); |
| |
| setupTool.rebalanceCluster(clusterName, resourceName, replicas, keyPrefix, groupTag); |
| |
| } else if (command.equalsIgnoreCase(ClusterSetup.expandResource)) { |
| setupTool.expandResource(clusterName, resourceName); |
| } else if (command.equalsIgnoreCase(ClusterSetup.addResourceProperty)) { |
| Map<String, String> parameterMap = jsonParameters.cloneParameterMap(); |
| parameterMap.remove(JsonParameters.MANAGEMENT_COMMAND); |
| for (String key : parameterMap.keySet()) { |
| setupTool.addResourceProperty(clusterName, resourceName, key, parameterMap.get(key)); |
| } |
| } else { |
| throw new HelixException("Unsupported command: " + command + ". Should be one of [" |
| + ClusterSetup.addIdealState + ", " + ClusterSetup.rebalance + ", " |
| + ClusterSetup.expandResource + ", " + ClusterSetup.addResourceProperty + "]"); |
| } |
| |
| getResponse().setEntity(getIdealStateRepresentation(clusterName, resourceName)); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } catch (Exception e) { |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| LOG.error("Error in posting " + entity, e); |
| } |
| return null; |
| } |
| } |