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Avoid throwing NPE when no master found #42419

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Avoid throwing NPE when no master found #42419

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47 changes: 20 additions & 27 deletions server/src/test/java/org/elasticsearch/cluster/SpecificMasterNodesIT.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.admin.cluster.configuration.AddVotingConfigExclusionsAction;
import org.elasticsearch.action.admin.cluster.configuration.AddVotingConfigExclusionsRequest;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.discovery.MasterNotDiscoveredException;
Expand All @@ -43,6 +44,18 @@
@TestLogging("_root:DEBUG,org.elasticsearch.action.admin.cluster.state:TRACE")
public class SpecificMasterNodesIT extends ESIntegTestCase {

private void assertMasterNameViaMultipleClients(String expectedMasterName) {
final DiscoveryNode masterViaNonMaster
= internalCluster().nonMasterClient().admin().cluster().prepareState().execute().actionGet().getState().nodes().getMasterNode();
assertNotNull(masterViaNonMaster);
assertThat(masterViaNonMaster.getName(), equalTo(expectedMasterName));

final DiscoveryNode masterViaMaster
= internalCluster().masterClient().admin().cluster().prepareState().execute().actionGet().getState().nodes().getMasterNode();
assertNotNull(masterViaMaster);
assertThat(masterViaMaster.getName(), equalTo(expectedMasterName));
}

public void testSimpleOnlyMasterNodeElection() throws IOException {
internalCluster().setBootstrapMasterNodeIndex(0);
logger.info("--> start data node / non master node");
Expand All @@ -59,10 +72,7 @@ public void testSimpleOnlyMasterNodeElection() throws IOException {
logger.info("--> start master node");
final String masterNodeName = internalCluster()
.startNode(Settings.builder().put(Node.NODE_DATA_SETTING.getKey(), false).put(Node.NODE_MASTER_SETTING.getKey(), true));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertMasterNameViaMultipleClients(masterNodeName);

logger.info("--> stop master node");
Settings masterDataPathSettings = internalCluster().dataPathSettings(internalCluster().getMasterName());
Expand All @@ -80,10 +90,7 @@ public void testSimpleOnlyMasterNodeElection() throws IOException {
final String nextMasterEligibleNodeName = internalCluster()
.startNode(Settings.builder().put(Node.NODE_DATA_SETTING.getKey(), false).put(Node.NODE_MASTER_SETTING.getKey(), true)
.put(masterDataPathSettings));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligibleNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligibleNodeName));
assertMasterNameViaMultipleClients(nextMasterEligibleNodeName);
}

public void testElectOnlyBetweenMasterNodes() throws Exception {
Expand All @@ -101,36 +108,22 @@ public void testElectOnlyBetweenMasterNodes() throws Exception {
logger.info("--> start master node (1)");
final String masterNodeName = internalCluster().startNode(Settings.builder().put(Node.NODE_DATA_SETTING.getKey(), false)
.put(Node.NODE_MASTER_SETTING.getKey(), true));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertMasterNameViaMultipleClients(masterNodeName);

logger.info("--> start master node (2)");
final String nextMasterEligableNodeName = internalCluster().startNode(Settings.builder()
final String nextMasterEligibleNodeName = internalCluster().startNode(Settings.builder()
.put(Node.NODE_DATA_SETTING.getKey(), false).put(Node.NODE_MASTER_SETTING.getKey(), true));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(masterNodeName));
assertMasterNameViaMultipleClients(masterNodeName);

logger.info("--> closing master node (1)");
client().execute(AddVotingConfigExclusionsAction.INSTANCE,
new AddVotingConfigExclusionsRequest(new String[]{masterNodeName})).get();
// removing the master from the voting configuration immediately triggers the master to step down
assertBusy(() -> {
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligableNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligableNodeName));
});
assertBusy(() -> assertMasterNameViaMultipleClients(nextMasterEligibleNodeName));
internalCluster().stopRandomNode(InternalTestCluster.nameFilter(masterNodeName));
assertThat(internalCluster().nonMasterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligableNodeName));
assertThat(internalCluster().masterClient().admin().cluster().prepareState()
.execute().actionGet().getState().nodes().getMasterNode().getName(), equalTo(nextMasterEligableNodeName));
assertMasterNameViaMultipleClients(nextMasterEligibleNodeName);
}

public void testAliasFilterValidation() {
Expand Down