keith-turner commented on code in PR #5530: URL: https://github.com/apache/accumulo/pull/5530#discussion_r2081956625
########## test/src/main/java/org/apache/accumulo/test/BrokenBalancerIT.java: ########## @@ -0,0 +1,150 @@ +/* + * 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 + * + * https://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.accumulo.test; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +import java.util.Map; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.Executors; + +import org.apache.accumulo.core.client.Accumulo; +import org.apache.accumulo.core.client.AccumuloClient; +import org.apache.accumulo.core.client.admin.NewTableConfiguration; +import org.apache.accumulo.core.conf.Property; +import org.apache.accumulo.core.data.TableId; +import org.apache.accumulo.core.spi.balancer.BalancerEnvironment; +import org.apache.accumulo.core.spi.balancer.SimpleLoadBalancer; +import org.apache.accumulo.core.spi.balancer.TableLoadBalancer; +import org.apache.accumulo.core.util.UtilWaitThread; +import org.apache.accumulo.minicluster.ServerType; +import org.apache.accumulo.miniclusterImpl.MiniAccumuloConfigImpl; +import org.apache.accumulo.test.functional.ConfigurableMacBase; +import org.apache.accumulo.test.util.Wait; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.io.Text; +import org.junit.jupiter.api.Assertions; +import org.junit.jupiter.api.Test; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class BrokenBalancerIT extends ConfigurableMacBase { + + private static final Logger log = LoggerFactory.getLogger(BrokenBalancerIT.class); + + public static class BrokenBalancer extends SimpleLoadBalancer { + public BrokenBalancer() { + super(); + } + + public BrokenBalancer(TableId tableId) { + super(tableId); + } + + @Override + public void init(BalancerEnvironment balancerEnvironment) { + throw new IllegalStateException(); + } + } + + @Override + public void configure(MiniAccumuloConfigImpl cfg, Configuration hadoopCoreSite) { + Map<String,String> siteConfig = cfg.getSiteConfig(); + siteConfig.put(Property.TSERV_MAXMEM.getKey(), "10K"); + siteConfig.put(Property.TSERV_MAJC_DELAY.getKey(), "50ms"); + siteConfig.put(Property.MANAGER_TABLET_GROUP_WATCHER_INTERVAL.getKey(), "3s"); + cfg.setSiteConfig(siteConfig); + // ensure we have two tservers + if (cfg.getNumTservers() != 2) { + cfg.setNumTservers(2); + } + } + + @Test + public void testBalancerException() throws Exception { + String tableName = getUniqueNames(1)[0]; + testBadBalancer(BrokenBalancer.class.getName(), tableName); + } + + @Test + public void testBalancerNotFound() throws Exception { + String tableName = getUniqueNames(1)[0]; + testBadBalancer("org.apache.accumulo.abc.NonExistentBalancer", tableName); + } + + private void testBadBalancer(String balancerClass, String tableName) throws Exception { + var executor = Executors.newCachedThreadPool(); + try (AccumuloClient c = Accumulo.newClient().from(getClientProperties()).build()) { + SortedSet<Text> splits = new TreeSet<>(); + for (int i = 0; i < 10; i++) { + splits.add(new Text("" + i)); + } + var props = Map.of(Property.TABLE_LOAD_BALANCER.getKey(), balancerClass); + NewTableConfiguration ntc = + new NewTableConfiguration().withSplits(splits).setProperties(props); + c.tableOperations().create(tableName, ntc); + + var scanFuture = executor.submit(() -> { + try (var scanner = c.createScanner(tableName)) { + scanner.forEach((k, v) -> System.out.println(k + " " + v)); + } + return 0; + }); + + UtilWaitThread.sleep(5000); + // scan should not be able to complete because the tablet should not be assigned + Assertions.assertFalse(scanFuture.isDone()); + + // fix the balancer config + log.info("fixing per tablet balancer"); + c.tableOperations().setProperty(tableName, Property.TABLE_LOAD_BALANCER.getKey(), + SimpleLoadBalancer.class.getName()); + + scanFuture.get(); + + // break the balancer at the system level + log.info("breaking manager balancer"); + c.instanceOperations().setProperty(Property.MANAGER_TABLET_BALANCER.getKey(), balancerClass); + + // add some tablet servers + assertEquals(2, getCluster().getConfig().getNumTservers()); + getCluster().getConfig().setNumTservers(5); + getCluster().getClusterControl().start(ServerType.TABLET_SERVER); + getCluster().getClusterControl().start(ServerType.TABLET_SERVER); Review Comment: That is good to know, I will adjust the test to match the actual behavior. -- This is an automated message from the Apache Git Service. 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