SolrCoreReloaderTest.java

/*
 * 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.cloud;

import java.io.IOException;
import java.lang.invoke.MethodHandles;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;

import org.apache.solr.client.solrj.request.CollectionAdminRequest;
import org.apache.solr.client.solrj.response.CollectionAdminResponse;
import org.apache.solr.common.cloud.*;
import org.apache.solr.common.util.NamedList;
import org.apache.zookeeper.KeeperException;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SolrCoreReloaderTest extends SolrCloudTestCase {
    private static final int TIMEOUT = 3000;
    private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());


    @BeforeClass
    public static void beforeTest() throws Exception {
        // System.setProperty("metricsEnabled", "true");
        configureCluster(4)
                .addConfig("conf", configset("cloud-minimal"))
                .addConfig("conf2", configset("cloud-dynamic"))
                .configure();
    }

    /**
     * When a config name is not specified during collection creation, the _default should be used.
     */
    @Test
    public void testCreateWithDefaultConfigSet() throws Exception {
        String collectionName = getSaferTestName();
        CollectionAdminResponse response =
                CollectionAdminRequest.createCollection(collectionName, 2, 2)
                        .setPerReplicaState(SolrCloudTestCase.USE_PER_REPLICA_STATE)
                        .process(cluster.getSolrClient());

        cluster.waitForActiveCollection(collectionName, 2, 4);

        assertEquals(0, response.getStatus());
        assertTrue(response.isSuccess());
        Map<String, NamedList<Integer>> coresStatus = response.getCollectionCoresStatus();
        assertEquals(4, coresStatus.size());
        for (String coreName : coresStatus.keySet()) {
            NamedList<Integer> status = coresStatus.get(coreName);
            assertEquals(0, (int) status.get("status"));
            assertTrue(status.get("QTime") > 0);
        }
        // Sometimes multiple cores land on the same node so it's less than 4
        int nodesCreated = response.getCollectionNodesStatus().size();
        // Use of _default configset should generate a warning for data-driven functionality in
        // production use
        assertTrue(
                response.getWarning() != null
                        && response.getWarning().contains("NOT RECOMMENDED for production use"));

//        response =
//                CollectionAdminRequest.deleteCollection(collectionName).process(cluster.getSolrClient());
//        assertEquals(0, response.getStatus());
//        assertTrue(response.isSuccess());
//        Map<String, NamedList<Integer>> nodesStatus = response.getCollectionNodesStatus();
//        assertEquals(nodesStatus.toString(), nodesCreated, nodesStatus.size());

//        waitForState(
//                "Expected " + collectionName + " to disappear from cluster state",
//                collectionName,
//                (n, c) -> c == null);

        SolrCoreReloader.main(new String[] {cluster.getZkServer().getZkAddress(), collectionName});
    }


}

class SolrCoreReloader {

    public static void main(String[] args) {
        try (SolrZkClient zkClient = new SolrZkClient.Builder().withUrl(args[0]).build()) {
            ZkStateReader zkStateReader = new ZkStateReader(zkClient);
            List<String> solrCoreUrls = fetchSolrCoreUrls(zkStateReader, args[1]);
            reloadSolrCores(solrCoreUrls).join();
            System.out.println("All cores reloaded.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static List<String> fetchSolrCoreUrls(ZkStateReader zkStateReader, String collectionName) throws KeeperException, InterruptedException, IOException {
        List<String> solrCoreUrls = new ArrayList<>();
        zkStateReader.createClusterStateWatchersAndUpdate();
        Map<String, ClusterState.CollectionRef> collectionStates = zkStateReader.getClusterState().getCollectionStates();

        if (collectionStates.containsKey(collectionName)) {
            ClusterState.CollectionRef collectionState = collectionStates.get(collectionName);
            Collection<Slice> slices = collectionState.get().getSlices();
            for (Slice slice : slices) {
                Collection<Replica> replicas = slice.getReplicas();
                for (Replica replica : replicas) {
                    String coreUrl = replica.getBaseUrl() + "/admin/cores?action=RELOAD&core=" + replica.get("core");
                    System.out.println("Core URL: " + coreUrl);
                    solrCoreUrls.add(coreUrl);
                }
            }
        }

        return solrCoreUrls;
    }

    private static CompletableFuture<Void> reloadSolrCores(List<String> solrCoreUrls) {
        HttpClient client = HttpClient.newHttpClient();
        List<CompletableFuture<Void>> futures = new ArrayList<>();

        for (String url : solrCoreUrls) {
            HttpRequest request = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .header("Content-Type", "application/json")
                    .GET()
                    .build();

            CompletableFuture<Void> future = client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
                    .thenApply(HttpResponse::body)
                    .thenAccept(body -> System.out.println("Reloaded core: " + url + " Response: " + body))
                    .exceptionally(e -> {
                        System.err.println("Failed to reload core: " + url + " Error: " + e.getMessage());
                        return null;
                    });
            futures.add(future);
        }

        return CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]));
    }
}