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server tags integration test and refresh
An integration test which proves that tags are updated appropriately on start and restart, using the cluster overview procedure.
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...se/causal-clustering/src/test/java/org/neo4j/causalclustering/scenarios/ServerTagsIT.java
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| /* | ||
| * Copyright (c) 2002-2017 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as | ||
| * published by the Free Software Foundation, either version 3 of the | ||
| * License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.causalclustering.scenarios; | ||
|
|
||
| import org.hamcrest.Description; | ||
| import org.hamcrest.TypeSafeMatcher; | ||
| import org.junit.After; | ||
| import org.junit.Rule; | ||
| import org.junit.Test; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import java.util.function.IntFunction; | ||
|
|
||
| import org.neo4j.causalclustering.core.CausalClusteringSettings; | ||
| import org.neo4j.causalclustering.core.CoreGraphDatabase; | ||
| import org.neo4j.causalclustering.discovery.Cluster; | ||
| import org.neo4j.causalclustering.discovery.CoreClusterMember; | ||
| import org.neo4j.causalclustering.discovery.HazelcastDiscoveryServiceFactory; | ||
| import org.neo4j.graphdb.Result; | ||
| import org.neo4j.kernel.api.KernelTransaction; | ||
| import org.neo4j.kernel.enterprise.api.security.EnterpriseSecurityContext; | ||
| import org.neo4j.kernel.impl.coreapi.InternalTransaction; | ||
| import org.neo4j.kernel.impl.store.format.standard.Standard; | ||
| import org.neo4j.test.rule.TestDirectory; | ||
| import org.neo4j.test.rule.fs.DefaultFileSystemRule; | ||
|
|
||
| import static java.lang.String.format; | ||
| import static java.util.Arrays.asList; | ||
| import static java.util.Collections.emptyMap; | ||
| import static java.util.concurrent.TimeUnit.SECONDS; | ||
| import static org.neo4j.test.assertion.Assert.assertEventually; | ||
|
|
||
| public class ServerTagsIT | ||
| { | ||
| @Rule | ||
| public TestDirectory testDir = TestDirectory.testDirectory(); | ||
| @Rule | ||
| public DefaultFileSystemRule fsRule = new DefaultFileSystemRule(); | ||
|
|
||
| private Cluster cluster; | ||
|
|
||
| @After | ||
| public void after() throws Exception | ||
| { | ||
| if ( cluster != null ) | ||
| { | ||
| cluster.shutdown(); | ||
| } | ||
| } | ||
|
|
||
| @Test | ||
| public void shouldUpdateTagsOnStart() throws Exception | ||
| { | ||
| AtomicReference<String> suffix = new AtomicReference<>( "before" ); | ||
| List<List<String>> expected; | ||
|
|
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| Map<String,IntFunction<String>> instanceCoreParams = new HashMap<>(); | ||
| instanceCoreParams.put( CausalClusteringSettings.server_tags.name(), ( id ) -> String.join( ", ", makeCoreTags( suffix.get(), id ) ) ); | ||
|
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| Map<String,IntFunction<String>> instanceReplicaParams = new HashMap<>(); | ||
| instanceReplicaParams.put( CausalClusteringSettings.server_tags.name(), ( id ) -> String.join( ", ", makeReplicaTags( suffix.get(), id ) ) ); | ||
|
|
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| int nServers = 3; | ||
| cluster = new Cluster( testDir.directory( "cluster" ), nServers, nServers, | ||
| new HazelcastDiscoveryServiceFactory(), emptyMap(), instanceCoreParams, | ||
| emptyMap(), instanceReplicaParams, Standard.LATEST_NAME ); | ||
|
|
||
| // when | ||
| cluster.start(); | ||
|
|
||
| // then | ||
| expected = new ArrayList<>(); | ||
| for ( CoreClusterMember core : cluster.coreMembers() ) | ||
| { | ||
| expected.add( makeCoreTags( suffix.get(), core.serverId() ) ); | ||
| expected.add( makeReplicaTags( suffix.get(), core.serverId() ) ); | ||
| } | ||
|
|
||
| for ( CoreClusterMember core : cluster.coreMembers() ) | ||
| { | ||
| assertEventually( core + " should have tags", () -> getServerTags( core.database() ), | ||
| new TagsMatcher( expected ), 30, SECONDS ); | ||
| } | ||
|
|
||
| // when | ||
| expected.remove( makeCoreTags( suffix.get(), 1 ) ); | ||
| expected.remove( makeReplicaTags( suffix.get(), 2 ) ); | ||
| cluster.getCoreMemberById( 1 ).shutdown(); | ||
| cluster.getReadReplicaById( 2 ).shutdown(); | ||
|
|
||
| suffix.set( "after" ); // should update tags of restarted servers | ||
| cluster.addCoreMemberWithId( 1 ).start(); | ||
| cluster.addReadReplicaWithId( 2 ).start(); | ||
| expected.add( makeCoreTags( suffix.get(), 1 ) ); | ||
| expected.add( makeReplicaTags( suffix.get(), 2 ) ); | ||
|
|
||
| // then | ||
| for ( CoreClusterMember core : cluster.coreMembers() ) | ||
| { | ||
| assertEventually( core + " should have tags", () -> getServerTags( core.database() ), | ||
| new TagsMatcher( expected ), 30, SECONDS ); | ||
| } | ||
| } | ||
|
|
||
| class TagsMatcher extends TypeSafeMatcher<List<List<String>>> | ||
| { | ||
| private final List<List<String>> expected; | ||
|
|
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| TagsMatcher( List<List<String>> expected ) | ||
| { | ||
| this.expected = expected; | ||
| } | ||
|
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| @Override | ||
| protected boolean matchesSafely( List<List<String>> actual ) | ||
| { | ||
| if ( actual.size() != expected.size() ) | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| for ( List<String> actualTags : actual ) | ||
| { | ||
| boolean matched = false; | ||
| for ( List<String> expectedTags : expected ) | ||
| { | ||
| if ( actualTags.size() != expectedTags.size() ) | ||
| { | ||
| continue; | ||
| } | ||
|
|
||
| if ( !actualTags.containsAll( expectedTags ) ) | ||
| { | ||
| continue; | ||
| } | ||
|
|
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| matched = true; | ||
| break; | ||
| } | ||
|
|
||
| if ( !matched ) | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
|
|
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| return true; | ||
| } | ||
|
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| @Override | ||
| public void describeTo( Description description ) | ||
| { | ||
| description.appendText( expected.toString() ); | ||
| } | ||
| } | ||
|
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| private List<String> makeCoreTags( String suffix, int id ) | ||
| { | ||
| return asList( format( "core-%d-%s", id, suffix ), "core" ); | ||
| } | ||
|
|
||
| private List<String> makeReplicaTags( String suffix, int id ) | ||
| { | ||
| return asList( format( "replica-%d-%s", id, suffix ), "replica" ); | ||
| } | ||
|
|
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| private List<List<String>> getServerTags( CoreGraphDatabase db ) | ||
| { | ||
| List<List<String>> serverTags = new ArrayList<>(); | ||
| try ( InternalTransaction tx = db.beginTransaction( KernelTransaction.Type.explicit, EnterpriseSecurityContext.AUTH_DISABLED ) ) | ||
| { | ||
| try ( Result result = db.execute( tx, "CALL dbms.cluster.overview", emptyMap() ) ) | ||
| { | ||
| while ( result.hasNext() ) | ||
| { | ||
| @SuppressWarnings( "unchecked" ) | ||
| List<String> tags = (List<String>) result.next().get( "tags" ); | ||
| serverTags.add( tags ); | ||
| } | ||
| } | ||
| } | ||
| return serverTags; | ||
| } | ||
| } |