epugh commented on code in PR #4171: URL: https://github.com/apache/solr/pull/4171#discussion_r2959180290
########## solr/core/src/java/org/apache/solr/handler/admin/api/NodeHealth.java: ########## @@ -0,0 +1,287 @@ +/* + * 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.handler.admin.api; + +import static org.apache.solr.client.api.model.NodeHealthResponse.NodeStatus.FAILURE; +import static org.apache.solr.client.api.model.NodeHealthResponse.NodeStatus.OK; +import static org.apache.solr.common.SolrException.ErrorCode.SERVER_ERROR; +import static org.apache.solr.common.SolrException.ErrorCode.SERVICE_UNAVAILABLE; +import static org.apache.solr.handler.admin.api.ReplicationAPIBase.GENERATION; +import static org.apache.solr.security.PermissionNameProvider.Name.HEALTH_PERM; + +import jakarta.inject.Inject; +import java.lang.invoke.MethodHandles; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.List; +import java.util.Locale; +import java.util.stream.Collectors; +import org.apache.lucene.index.IndexCommit; +import org.apache.solr.api.JerseyResource; +import org.apache.solr.client.api.endpoint.NodeHealthApi; +import org.apache.solr.client.api.model.NodeHealthResponse; +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.Replica.State; +import org.apache.solr.common.cloud.ZkStateReader; +import org.apache.solr.common.util.NamedList; +import org.apache.solr.core.CoreContainer; +import org.apache.solr.core.CoreDescriptor; +import org.apache.solr.core.SolrCore; +import org.apache.solr.handler.IndexFetcher; +import org.apache.solr.handler.ReplicationHandler; +import org.apache.solr.jersey.PermissionName; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * V2 API for checking the health of the receiving node. + * + * <p>This API (GET /v2/node/health) is analogous to the v1 /admin/info/health. + * + * <p>The v1 {@link org.apache.solr.handler.admin.HealthCheckHandler} delegates to this class. + */ +public class NodeHealth extends JerseyResource implements NodeHealthApi { + + private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + private static final List<State> UNHEALTHY_STATES = Arrays.asList(State.DOWN, State.RECOVERING); + + private final CoreContainer coreContainer; + + @Inject + public NodeHealth(CoreContainer coreContainer) { + this.coreContainer = coreContainer; + } + + @Override + @PermissionName(HEALTH_PERM) + public NodeHealthResponse healthcheck(Boolean requireHealthyCores) { + return checkNodeHealth(requireHealthyCores, null); + } + + /** + * Performs the node health check and returns the result as a {@link NodeHealthResponse}. + * + * <p>This overload is used by the v1 {@link + * org.apache.solr.handler.admin.HealthCheckHandler#handleRequestBody} path, which can supply the + * legacy {@code maxGenerationLag} parameter that is not exposed via the v2 endpoint. + */ + public NodeHealthResponse checkNodeHealth(Boolean requireHealthyCores, Integer maxGenerationLag) { + if (coreContainer == null || coreContainer.isShutDown()) { + throw new SolrException( + SERVER_ERROR, "CoreContainer is either not initialized or shutting down"); + } + + final NodeHealthResponse response = instantiateJerseyResponse(NodeHealthResponse.class); + + if (!coreContainer.isZooKeeperAware()) { + if (log.isDebugEnabled()) { + log.debug("Invoked HealthCheckHandler in legacy mode."); + } + healthCheckLegacyMode(response, maxGenerationLag); + } else { + if (log.isDebugEnabled()) { + log.debug( + "Invoked HealthCheckHandler in cloud mode on [{}]", + coreContainer.getZkController().getNodeName()); + } + healthCheckCloudMode(response, requireHealthyCores); + } + + return response; + } + + private void healthCheckCloudMode(NodeHealthResponse response, Boolean requireHealthyCores) { + ClusterState clusterState = getClusterState(); + + if (Boolean.TRUE.equals(requireHealthyCores)) { + if (!coreContainer.isStatusLoadComplete()) { + throw new SolrException(SERVICE_UNAVAILABLE, "Host Unavailable: Core Loading not complete"); + } + Collection<CloudDescriptor> coreDescriptors = + coreContainer.getCoreDescriptors().stream() + .map(CoreDescriptor::getCloudDescriptor) + .collect(Collectors.toList()); + int unhealthyCores = findUnhealthyCores(coreDescriptors, clusterState); + if (unhealthyCores > 0) { + response.numCoresUnhealthy = unhealthyCores; + throw new SolrException( + SERVICE_UNAVAILABLE, + unhealthyCores + + " out of " + + coreContainer.getNumAllCores() + + " replicas are currently initializing or recovering"); + } + response.message = "All cores are healthy"; + } + + response.status = OK; + } + + private ClusterState getClusterState() { + ZkStateReader zkStateReader = coreContainer.getZkController().getZkStateReader(); + ClusterState clusterState = zkStateReader.getClusterState(); + + if (zkStateReader.getZkClient().isClosed() || !zkStateReader.getZkClient().isConnected()) { + throw new SolrException(SERVICE_UNAVAILABLE, "Host Unavailable: Not connected to zk"); + } + + if (!clusterState.getLiveNodes().contains(coreContainer.getZkController().getNodeName())) { + throw new SolrException(SERVICE_UNAVAILABLE, "Host Unavailable: Not in live nodes as per zk"); + } + return clusterState; + } + + private void healthCheckLegacyMode(NodeHealthResponse response, Integer maxGenerationLag) { + List<String> laggingCoresInfo = new ArrayList<>(); + boolean allCoresAreInSync = true; + + if (maxGenerationLag != null) { + if (maxGenerationLag < 0) { + log.error("Invalid value for maxGenerationLag:[{}]", maxGenerationLag); + response.message = + String.format(Locale.ROOT, "Invalid value of maxGenerationLag:%s", maxGenerationLag); + response.status = FAILURE; + return; Review Comment: I don't think i did it intentionally, but we did do something around better eturn values that I got copilot help on! -- This is an automated message from the Apache Git Service. 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