ndimiduk commented on a change in pull request #830: HBASE-23281: Track meta region locations in masters URL: https://github.com/apache/hbase/pull/830#discussion_r347674584
########## File path: hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaRegionLocationCache.java ########## @@ -0,0 +1,124 @@ +/* + * 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.hadoop.hbase.client; + +import static junit.framework.TestCase.assertTrue; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import org.apache.commons.io.IOUtils; +import org.apache.hadoop.hbase.HBaseClassTestRule; +import org.apache.hadoop.hbase.HBaseTestingUtility; +import org.apache.hadoop.hbase.HConstants; +import org.apache.hadoop.hbase.HRegionLocation; +import org.apache.hadoop.hbase.master.HMaster; +import org.apache.hadoop.hbase.master.RegionState; +import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer; +import org.apache.hadoop.hbase.testclassification.MasterTests; +import org.apache.hadoop.hbase.testclassification.SmallTests; +import org.apache.hadoop.hbase.util.JVMClusterUtil; +import org.apache.hadoop.hbase.zookeeper.MetaTableLocator; +import org.apache.hadoop.hbase.zookeeper.ZKWatcher; +import org.apache.hadoop.hbase.zookeeper.ZNodePaths; +import org.junit.AfterClass; +import org.junit.BeforeClass; +import org.junit.ClassRule; +import org.junit.Test; +import org.junit.experimental.categories.Category; + +@Category({SmallTests.class, MasterTests.class }) +public class TestMetaRegionLocationCache { + @ClassRule + public static final HBaseClassTestRule CLASS_RULE = + HBaseClassTestRule.forClass(TestMetaRegionLocationCache.class); + + private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(); + private static AsyncRegistry REGISTRY; + + @BeforeClass + public static void setUp() throws Exception { + TEST_UTIL.getConfiguration().set(BaseLoadBalancer.TABLES_ON_MASTER, "none"); + TEST_UTIL.getConfiguration().setInt(HConstants.META_REPLICAS_NUM, 3); + TEST_UTIL.startMiniCluster(3); + REGISTRY = AsyncRegistryFactory.getRegistry(TEST_UTIL.getConfiguration()); + RegionReplicaTestHelper.waitUntilAllMetaReplicasHavingRegionLocation( + TEST_UTIL.getConfiguration(), REGISTRY, 3); + TEST_UTIL.getAdmin().balancerSwitch(false, true); + } + + @AfterClass + public static void cleanUp() throws Exception { + IOUtils.closeQuietly(REGISTRY); + TEST_UTIL.shutdownMiniCluster(); + } + + private List<HRegionLocation> getCurrentMetaLocations(ZKWatcher zk) throws Exception { + List<HRegionLocation> result = new ArrayList<>(); + for (String znode: zk.getMetaReplicaNodes()) { + String path = ZNodePaths.joinZNode(zk.getZNodePaths().baseZNode, znode); + int replicaId = zk.getZNodePaths().getMetaReplicaIdFromPath(path); + RegionState state = MetaTableLocator.getMetaRegionState(zk, replicaId); + result.add(new HRegionLocation(state.getRegion(), state.getServerName())); + } + return result; + } + + // Verifies that the cached meta locations in the given master are in sync with what is in ZK. + private void verifyCachedMetaLocations(HMaster master) throws Exception { + List<HRegionLocation> metaHRLs = + master.getMetaRegionLocationCache().getMetaRegionLocations().get(); + assertTrue(metaHRLs != null); Review comment: Because you used `Optional.get()` above, this can never be null. Also, `assertNotNull` exists. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
