madrob commented on a change in pull request #559: URL: https://github.com/apache/solr/pull/559#discussion_r792283834
########## File path: solr/core/src/java/org/apache/solr/servlet/CoordinatorHttpSolrCall.java ########## @@ -0,0 +1,255 @@ +/* + * 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. + */ + +package org.apache.solr.servlet; + +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; + +import java.lang.invoke.MethodHandles; +import java.security.Principal; +import java.util.Map; +import java.util.Properties; +import java.util.concurrent.ConcurrentHashMap; +import org.apache.solr.client.solrj.request.CollectionAdminRequest; +import org.apache.solr.cloud.CloudDescriptor; +import org.apache.solr.common.SolrException; +import org.apache.solr.common.cloud.ClusterState; +import org.apache.solr.common.cloud.DocCollection; +import org.apache.solr.common.cloud.Replica; +import org.apache.solr.common.cloud.ZkStateReader; +import org.apache.solr.common.params.SolrParams; +import org.apache.solr.common.util.ContentStream; +import org.apache.solr.common.util.Utils; +import org.apache.solr.core.CoreContainer; +import org.apache.solr.core.CoreDescriptor; +import org.apache.solr.core.SolrCore; +import org.apache.solr.request.LocalSolrQueryRequest; +import org.apache.solr.request.SolrQueryRequest; +import org.apache.solr.response.SolrQueryResponse; +import org.apache.solr.schema.IndexSchema; +import org.apache.solr.search.SolrIndexSearcher; +import org.apache.solr.util.RTimerTree; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class CoordinatorHttpSolrCall extends HttpSolrCall { + public static final String SYNTHETIC_COLL_PREFIX = "SYNTHETIC-CONF-COLL_"; + private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + private String collectionName; + + public CoordinatorHttpSolrCall(SolrDispatchFilter solrDispatchFilter, CoreContainer cores, HttpServletRequest request, + HttpServletResponse response, boolean retry) { + super(solrDispatchFilter, cores, request, response, retry); + } + + @Override + protected SolrCore getCoreByCollection(String collectionName, boolean isPreferLeader) { + this.collectionName = collectionName; + SolrCore core = super.getCoreByCollection(collectionName, isPreferLeader); + if (core != null) return core; + return getCore(this, collectionName, isPreferLeader); + } + + @SuppressWarnings("unchecked") + public static SolrCore getCore(HttpSolrCall solrCall, String collectionName, boolean isPreferLeader) { + Map<String, String> coreNameMapping= (Map<String, String>) solrCall.cores.getObjectCache().computeIfAbsent(CoordinatorHttpSolrCall.class.getName(), + s -> new ConcurrentHashMap<>()); + String sytheticCoreName = coreNameMapping.get(collectionName); + if (sytheticCoreName != null) { + return solrCall.cores.getCore(sytheticCoreName); + } else { + ZkStateReader zkStateReader = solrCall.cores.getZkController().getZkStateReader(); + ClusterState clusterState = zkStateReader.getClusterState(); + DocCollection coll = clusterState.getCollectionOrNull(collectionName, true); + if (coll != null) { Review comment: I feel like this class would benefit from additional in-line comments explaining what is going on. ########## File path: solr/core/src/java/org/apache/solr/servlet/CoordinatorHttpSolrCall.java ########## @@ -0,0 +1,255 @@ +/* + * 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. + */ + +package org.apache.solr.servlet; + +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; + +import java.lang.invoke.MethodHandles; +import java.security.Principal; +import java.util.Map; +import java.util.Properties; +import java.util.concurrent.ConcurrentHashMap; +import org.apache.solr.client.solrj.request.CollectionAdminRequest; +import org.apache.solr.cloud.CloudDescriptor; +import org.apache.solr.common.SolrException; +import org.apache.solr.common.cloud.ClusterState; +import org.apache.solr.common.cloud.DocCollection; +import org.apache.solr.common.cloud.Replica; +import org.apache.solr.common.cloud.ZkStateReader; +import org.apache.solr.common.params.SolrParams; +import org.apache.solr.common.util.ContentStream; +import org.apache.solr.common.util.Utils; +import org.apache.solr.core.CoreContainer; +import org.apache.solr.core.CoreDescriptor; +import org.apache.solr.core.SolrCore; +import org.apache.solr.request.LocalSolrQueryRequest; +import org.apache.solr.request.SolrQueryRequest; +import org.apache.solr.response.SolrQueryResponse; +import org.apache.solr.schema.IndexSchema; +import org.apache.solr.search.SolrIndexSearcher; +import org.apache.solr.util.RTimerTree; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class CoordinatorHttpSolrCall extends HttpSolrCall { + public static final String SYNTHETIC_COLL_PREFIX = "SYNTHETIC-CONF-COLL_"; + private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + private String collectionName; + + public CoordinatorHttpSolrCall(SolrDispatchFilter solrDispatchFilter, CoreContainer cores, HttpServletRequest request, + HttpServletResponse response, boolean retry) { + super(solrDispatchFilter, cores, request, response, retry); + } + + @Override + protected SolrCore getCoreByCollection(String collectionName, boolean isPreferLeader) { + this.collectionName = collectionName; + SolrCore core = super.getCoreByCollection(collectionName, isPreferLeader); + if (core != null) return core; + return getCore(this, collectionName, isPreferLeader); + } + + @SuppressWarnings("unchecked") + public static SolrCore getCore(HttpSolrCall solrCall, String collectionName, boolean isPreferLeader) { + Map<String, String> coreNameMapping= (Map<String, String>) solrCall.cores.getObjectCache().computeIfAbsent(CoordinatorHttpSolrCall.class.getName(), + s -> new ConcurrentHashMap<>()); + String sytheticCoreName = coreNameMapping.get(collectionName); + if (sytheticCoreName != null) { + return solrCall.cores.getCore(sytheticCoreName); + } else { + ZkStateReader zkStateReader = solrCall.cores.getZkController().getZkStateReader(); + ClusterState clusterState = zkStateReader.getClusterState(); + DocCollection coll = clusterState.getCollectionOrNull(collectionName, true); + if (coll != null) { + String confName = coll.getConfigName(); + String syntheticCollectionName = SYNTHETIC_COLL_PREFIX + confName; + DocCollection syntheticColl = clusterState.getCollectionOrNull(syntheticCollectionName); + if (syntheticColl == null) { + // no such collection. let's create one + log.info("synthetic collection: {} does not exist, creating.. ", syntheticCollectionName); + createColl(syntheticCollectionName, solrCall.cores, confName); + } + SolrCore core = solrCall.getCoreByCollection(syntheticCollectionName, isPreferLeader); + if (core != null) { + coreNameMapping.put(collectionName, core.getName()); + log.info("coordinator NODE , returns synthetic core " + core.getName()); + } else { + //this node does not have a replica. add one + log.info("this node does not have a replica of the synthetic collection: {} , adding replica ", syntheticCollectionName); + + addReplica(syntheticCollectionName, solrCall.cores); + core = solrCall.getCoreByCollection(syntheticCollectionName, isPreferLeader); + } + return core; + + } + return null; + } + + } + private static void addReplica(String syntheticCollectionName, CoreContainer cores) { + SolrQueryResponse rsp = new SolrQueryResponse(); + try { + cores.getCollectionsHandler().handleRequestBody(new LocalSolrQueryRequest(null, + CollectionAdminRequest.addReplicaToShard(syntheticCollectionName, "shard1") + .setCreateNodeSet(cores.getZkController().getNodeName()) + .getParams() + ), rsp); + if (rsp.getValues().get("success") == null) { + throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Could not auto-create collection: " + Utils.toJSONString(rsp.getValues())); + } + } catch (SolrException e) { + throw e; + + } catch (Exception e) { + throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e); + } + + } + + private static void createColl(String syntheticCollectionName, CoreContainer cores, String confName) { + SolrQueryResponse rsp = new SolrQueryResponse(); + try { + SolrParams params = CollectionAdminRequest.createCollection(syntheticCollectionName, confName, 1, 1) + .setCreateNodeSet(cores.getZkController().getNodeName()).getParams(); + log.info("sending collection admin command : {}", Utils.toJSONString(params)); + cores.getCollectionsHandler() + .handleRequestBody(new LocalSolrQueryRequest(null, + params), rsp); + if (rsp.getValues().get("success") == null) { + throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Could not create :" + syntheticCollectionName + " collection: " + Utils.toJSONString(rsp.getValues())); + } + } catch (SolrException e) { + throw e; + + } catch (Exception e) { + throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e); + } + } + + @Override + protected void init() throws Exception { + super.init(); + if(action == SolrDispatchFilter.Action.PROCESS && core != null) { + solrReq = wrappedReq(solrReq, collectionName, this); + } + } + + public static SolrQueryRequest wrappedReq(SolrQueryRequest delegate, String collectionName, HttpSolrCall httpSolrCall) { + Properties p = new Properties(); + p.put(CoreDescriptor.CORE_COLLECTION, collectionName); + p.put(CloudDescriptor.REPLICA_TYPE, Replica.Type.PULL.toString()); + p.put(CoreDescriptor.CORE_SHARD, "_"); Review comment: Is this a special value? 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